Geriatrics

Exercise prevents falls in people older than 60 years, especially if it focuses on balance and mimics daily activities, according to a Cochrane Review meta-analysis of 108 randomized controlled trials.

kali9/Getty Images

Exercise has been shown to prevent falls in older people, but given the potential consequences, the investigators thought an up-to-date synthesis of the evidence was in order. The analysis focused on people living independently who had not recently been discharged from a hospital. The trials involved 23,407 subjects from 25 countries. The review was exhaustive; the final report is almost 600 pages long (Cochrane Database Syst Rev. 2019 Jan 31;1:CD012424. doi: 10.1002/14651858.CD012424.pub2).

The type of exercise matters. The researchers cited “high-certainty evidence” that exercise involving balance and functional training reduces falls. “Tai chi may also prevent falls,” they noted, adding that they were uncertain of the effect of dance, walking, and resistance training by itself. There was no evidence to determine the effects of flexibility or endurance exercises, added the researchers, led by Cathie Sherrington, PhD, of the University of Sydney Institute for Musculoskeletal Health.

Functional exercise mimics everyday movement, with the goal of improving performance. Multidirectional lunges are an example, helping the body prepare for vacuuming, yard work, and other common activities.

“Exercise [programs] carried out in group classes or done at home prescribed by a health professional ... or a trained exercise leader were effective. Exercises were mostly done while standing as this better enhances balance and the ability to do daily activities such as standing up from a low chair or climbing stairs,” according to a Cochrane press release regarding the study.

Overall, exercise reduced the number of falls by 23%, and the number of fallers by 15%, with high-certainty evidence.

Exercise also brought down the number of people facing fall fractures by over 27%, the number of people requiring medical attention for a fall by 39%, and the number ending up in the hospital for a fall by 22%.

Balance and functional exercises reduced the rate of falls by 24%, and the number of fallers by 13%. The effects were even greater when resistance exercises were added to the mix; drops in fall rates and the number of people experiencing falls were 34% and 22%, respectively. There was low-certainty evidence that tai chi reduces the rate of falls by 19% and the number of people experiencing falls by 20%.

Despite fall prevention, “exercise may make little important difference to health-related quality of life;” when results were converted to EQ-5D and 36-Item Short Form Survey scores, “the respective 95% [confidence intervals] were much smaller than minimally important differences,” the investigators said.

Serious adverse events occurred in participants in one of the 27 trials that reported adverse events. These two serious adverse events were a pelvic stress fracture and an inguinal hernia surgery. Most of the other adverse events reported, all non-serious, were musculoskeletal.

On average, participants were 76 years old, and 77% were women. Disease specific trials – such as exercise for stroke rehabilitation – were excluded.

The work was supported primarily by the Cochrane Bone, Joint and Muscle Trauma Group, based at the University of Manchester, England, and Cochrane’s Acute and Emergency Care Network. There were no industry disclosures.
 

aotto@mdedge.com

SOURCE: Sherrington C et al. Cochrane Database Syst Rev. 2019 Jan 31;1:CD012424. doi: 10.1002/14651858.CD012424.pub2.

Exercise prevents falls in people older than 60 years, especially if it focuses on balance and mimics daily activities, according to a Cochrane Review meta-analysis of 108 randomized controlled trials.

kali9/Getty Images

Exercise has been shown to prevent falls in older people, but given the potential consequences, the investigators thought an up-to-date synthesis of the evidence was in order. The analysis focused on people living independently who had not recently been discharged from a hospital. The trials involved 23,407 subjects from 25 countries. The review was exhaustive; the final report is almost 600 pages long (Cochrane Database Syst Rev. 2019 Jan 31;1:CD012424. doi: 10.1002/14651858.CD012424.pub2).

The type of exercise matters. The researchers cited “high-certainty evidence” that exercise involving balance and functional training reduces falls. “Tai chi may also prevent falls,” they noted, adding that they were uncertain of the effect of dance, walking, and resistance training by itself. There was no evidence to determine the effects of flexibility or endurance exercises, added the researchers, led by Cathie Sherrington, PhD, of the University of Sydney Institute for Musculoskeletal Health.

Functional exercise mimics everyday movement, with the goal of improving performance. Multidirectional lunges are an example, helping the body prepare for vacuuming, yard work, and other common activities.

“Exercise [programs] carried out in group classes or done at home prescribed by a health professional ... or a trained exercise leader were effective. Exercises were mostly done while standing as this better enhances balance and the ability to do daily activities such as standing up from a low chair or climbing stairs,” according to a Cochrane press release regarding the study.

Overall, exercise reduced the number of falls by 23%, and the number of fallers by 15%, with high-certainty evidence.

Exercise also brought down the number of people facing fall fractures by over 27%, the number of people requiring medical attention for a fall by 39%, and the number ending up in the hospital for a fall by 22%.

Balance and functional exercises reduced the rate of falls by 24%, and the number of fallers by 13%. The effects were even greater when resistance exercises were added to the mix; drops in fall rates and the number of people experiencing falls were 34% and 22%, respectively. There was low-certainty evidence that tai chi reduces the rate of falls by 19% and the number of people experiencing falls by 20%.

Despite fall prevention, “exercise may make little important difference to health-related quality of life;” when results were converted to EQ-5D and 36-Item Short Form Survey scores, “the respective 95% [confidence intervals] were much smaller than minimally important differences,” the investigators said.

Serious adverse events occurred in participants in one of the 27 trials that reported adverse events. These two serious adverse events were a pelvic stress fracture and an inguinal hernia surgery. Most of the other adverse events reported, all non-serious, were musculoskeletal.

On average, participants were 76 years old, and 77% were women. Disease specific trials – such as exercise for stroke rehabilitation – were excluded.

The work was supported primarily by the Cochrane Bone, Joint and Muscle Trauma Group, based at the University of Manchester, England, and Cochrane’s Acute and Emergency Care Network. There were no industry disclosures.
 

aotto@mdedge.com

SOURCE: Sherrington C et al. Cochrane Database Syst Rev. 2019 Jan 31;1:CD012424. doi: 10.1002/14651858.CD012424.pub2.

Exercise prevents falls in people older than 60 years, especially if it focuses on balance and mimics daily activities, according to a Cochrane Review meta-analysis of 108 randomized controlled trials.

kali9/Getty Images

Exercise has been shown to prevent falls in older people, but given the potential consequences, the investigators thought an up-to-date synthesis of the evidence was in order. The analysis focused on people living independently who had not recently been discharged from a hospital. The trials involved 23,407 subjects from 25 countries. The review was exhaustive; the final report is almost 600 pages long (Cochrane Database Syst Rev. 2019 Jan 31;1:CD012424. doi: 10.1002/14651858.CD012424.pub2).

The type of exercise matters. The researchers cited “high-certainty evidence” that exercise involving balance and functional training reduces falls. “Tai chi may also prevent falls,” they noted, adding that they were uncertain of the effect of dance, walking, and resistance training by itself. There was no evidence to determine the effects of flexibility or endurance exercises, added the researchers, led by Cathie Sherrington, PhD, of the University of Sydney Institute for Musculoskeletal Health.

Functional exercise mimics everyday movement, with the goal of improving performance. Multidirectional lunges are an example, helping the body prepare for vacuuming, yard work, and other common activities.

“Exercise [programs] carried out in group classes or done at home prescribed by a health professional ... or a trained exercise leader were effective. Exercises were mostly done while standing as this better enhances balance and the ability to do daily activities such as standing up from a low chair or climbing stairs,” according to a Cochrane press release regarding the study.

Overall, exercise reduced the number of falls by 23%, and the number of fallers by 15%, with high-certainty evidence.

Exercise also brought down the number of people facing fall fractures by over 27%, the number of people requiring medical attention for a fall by 39%, and the number ending up in the hospital for a fall by 22%.

Balance and functional exercises reduced the rate of falls by 24%, and the number of fallers by 13%. The effects were even greater when resistance exercises were added to the mix; drops in fall rates and the number of people experiencing falls were 34% and 22%, respectively. There was low-certainty evidence that tai chi reduces the rate of falls by 19% and the number of people experiencing falls by 20%.

Despite fall prevention, “exercise may make little important difference to health-related quality of life;” when results were converted to EQ-5D and 36-Item Short Form Survey scores, “the respective 95% [confidence intervals] were much smaller than minimally important differences,” the investigators said.

Serious adverse events occurred in participants in one of the 27 trials that reported adverse events. These two serious adverse events were a pelvic stress fracture and an inguinal hernia surgery. Most of the other adverse events reported, all non-serious, were musculoskeletal.

On average, participants were 76 years old, and 77% were women. Disease specific trials – such as exercise for stroke rehabilitation – were excluded.

The work was supported primarily by the Cochrane Bone, Joint and Muscle Trauma Group, based at the University of Manchester, England, and Cochrane’s Acute and Emergency Care Network. There were no industry disclosures.
 

aotto@mdedge.com

SOURCE: Sherrington C et al. Cochrane Database Syst Rev. 2019 Jan 31;1:CD012424. doi: 10.1002/14651858.CD012424.pub2.

A plasma proteomic study has identified new biomarkers of Alzheimer’s disease pathology in cognitively unimpaired individuals, researchers reported in Science Advances.

Kheng guan Toh/Thinkstock

“To our knowledge, this is the first time that a multianalyte plasma biomarker panel for an Alzheimer’s disease–related phenotype has been found and independently replicated by a nontargeted mass spectrometry approach,” said Nicholas J. Ashton, PhD, of King’s College London and the University of Gothenburg in Sweden, and his research colleagues.

Blood-based measures that predict amyloid-beta burden in preclinical Alzheimer’s disease have the potential to help investigators conduct clinical trials and aid in diagnostic management. However, this novel approach needs to be validated and translated “to a simpler automated platform suitable for wider utility,” the investigators noted. In addition, it is unclear whether their classifier can track changes in amyloid-beta or differentiate between other diseases with amyloid-beta pathology.

Advances in mass spectrometry technology have renewed interest in the analysis of plasma proteins in patients with various diseases. To assess whether proteomic discovery in plasma can help predict amyloid-beta burden in preclinical Alzheimer’s disease, Dr. Ashton and his colleagues studied 238 cognitively unimpaired individuals from the Australian Imaging, Biomarker and Lifestyle Flagship Study of Ageing (AIBL) and the Kerr Anglican Retirement Village Initiative in Ageing Health (KARVIAH). The participants had undergone PET to determine their amyloid-beta status. In the AIBL cohort (n = 144), 100 participants were amyloid-beta negative, and 44 were amyloid-beta positive. In the KARVIAH cohort (n = 94), 59 participants were amyloid-beta negative, and 35 were amyloid-beta positive. There were significantly more APOE4 carriers in the amyloid-beta–positive groups than in the amyloid-beta–negative groups. In addition, the amyloid-beta–positive groups tended to be older.

A support vector machine analysis created classifiers predicting amyloid-beta positivity in the AIBL cohort using demographics, proteins, or both. The researchers then tested each classifier in the KARVIAH dataset to identify which model best predicted amyloid-beta positivity. The optimal model included 10 protein features (prothrombin, adhesion G protein–coupled receptor, amyloid-beta A4 protein, NGN2, DNAH10, REST, NfL, RPS6KA3, GPSM2, FHAD1) and two demographic features (APOE4 count and age).

The classifier achieved a testing area under the receiver operator characteristic curve of 0.891 in the KARVIAH cohort to predict amyloid-beta positivity in cognitively unimpaired individuals with a sensitivity of 0.78 and specificity of 0.77.

The 10 protein features “represent a diverse array of pathways,” and the highest ranked feature was the serine protease prothrombin, which is a precursor to thrombin, the authors noted. “Multiple lines of evidence support that cerebrovascular disease may play a role in AD and that amyloid-beta may be involved in thrombosis, fibrinolysis, and inflammation via its interaction with the coagulation cascade,” the researchers wrote.

Two of the biomarkers – amyloid-beta A4 protein and NfL – have been examined in prior research and had a greater effect size in a secondary analysis that included participants with mild cognitive impairment and Alzheimer’s disease. This finding confirms “their connection with the more established disease state,” Dr. Ashton and colleagues said. In the secondary analysis, the optimal classifier included one demographic factor (APOE4 count) and nine protein features, eight of which also were used in the cognitively unimpaired classifier.

The study was funded in part by the National Institute for Health Research Biomedical Research Centre at South London and Maudsley NHS Foundation Trust and King’s College London, and many authors reported additional research support from various institutions. One author is an employee of Johnson & Johnson and a named inventor on unrelated biomarker intellectual property owned by Proteome Science and King’s College London.

jremaly@mdedge.com

SOURCE: Ashton NJ et al. Sci Adv. 2019 Feb 6. doi: 10.1126/sciadv.aau7220.

A plasma proteomic study has identified new biomarkers of Alzheimer’s disease pathology in cognitively unimpaired individuals, researchers reported in Science Advances.

Kheng guan Toh/Thinkstock

“To our knowledge, this is the first time that a multianalyte plasma biomarker panel for an Alzheimer’s disease–related phenotype has been found and independently replicated by a nontargeted mass spectrometry approach,” said Nicholas J. Ashton, PhD, of King’s College London and the University of Gothenburg in Sweden, and his research colleagues.

Blood-based measures that predict amyloid-beta burden in preclinical Alzheimer’s disease have the potential to help investigators conduct clinical trials and aid in diagnostic management. However, this novel approach needs to be validated and translated “to a simpler automated platform suitable for wider utility,” the investigators noted. In addition, it is unclear whether their classifier can track changes in amyloid-beta or differentiate between other diseases with amyloid-beta pathology.

Advances in mass spectrometry technology have renewed interest in the analysis of plasma proteins in patients with various diseases. To assess whether proteomic discovery in plasma can help predict amyloid-beta burden in preclinical Alzheimer’s disease, Dr. Ashton and his colleagues studied 238 cognitively unimpaired individuals from the Australian Imaging, Biomarker and Lifestyle Flagship Study of Ageing (AIBL) and the Kerr Anglican Retirement Village Initiative in Ageing Health (KARVIAH). The participants had undergone PET to determine their amyloid-beta status. In the AIBL cohort (n = 144), 100 participants were amyloid-beta negative, and 44 were amyloid-beta positive. In the KARVIAH cohort (n = 94), 59 participants were amyloid-beta negative, and 35 were amyloid-beta positive. There were significantly more APOE4 carriers in the amyloid-beta–positive groups than in the amyloid-beta–negative groups. In addition, the amyloid-beta–positive groups tended to be older.

A support vector machine analysis created classifiers predicting amyloid-beta positivity in the AIBL cohort using demographics, proteins, or both. The researchers then tested each classifier in the KARVIAH dataset to identify which model best predicted amyloid-beta positivity. The optimal model included 10 protein features (prothrombin, adhesion G protein–coupled receptor, amyloid-beta A4 protein, NGN2, DNAH10, REST, NfL, RPS6KA3, GPSM2, FHAD1) and two demographic features (APOE4 count and age).

The classifier achieved a testing area under the receiver operator characteristic curve of 0.891 in the KARVIAH cohort to predict amyloid-beta positivity in cognitively unimpaired individuals with a sensitivity of 0.78 and specificity of 0.77.

The 10 protein features “represent a diverse array of pathways,” and the highest ranked feature was the serine protease prothrombin, which is a precursor to thrombin, the authors noted. “Multiple lines of evidence support that cerebrovascular disease may play a role in AD and that amyloid-beta may be involved in thrombosis, fibrinolysis, and inflammation via its interaction with the coagulation cascade,” the researchers wrote.

Two of the biomarkers – amyloid-beta A4 protein and NfL – have been examined in prior research and had a greater effect size in a secondary analysis that included participants with mild cognitive impairment and Alzheimer’s disease. This finding confirms “their connection with the more established disease state,” Dr. Ashton and colleagues said. In the secondary analysis, the optimal classifier included one demographic factor (APOE4 count) and nine protein features, eight of which also were used in the cognitively unimpaired classifier.

The study was funded in part by the National Institute for Health Research Biomedical Research Centre at South London and Maudsley NHS Foundation Trust and King’s College London, and many authors reported additional research support from various institutions. One author is an employee of Johnson & Johnson and a named inventor on unrelated biomarker intellectual property owned by Proteome Science and King’s College London.

jremaly@mdedge.com

SOURCE: Ashton NJ et al. Sci Adv. 2019 Feb 6. doi: 10.1126/sciadv.aau7220.

A plasma proteomic study has identified new biomarkers of Alzheimer’s disease pathology in cognitively unimpaired individuals, researchers reported in Science Advances.

Kheng guan Toh/Thinkstock

“To our knowledge, this is the first time that a multianalyte plasma biomarker panel for an Alzheimer’s disease–related phenotype has been found and independently replicated by a nontargeted mass spectrometry approach,” said Nicholas J. Ashton, PhD, of King’s College London and the University of Gothenburg in Sweden, and his research colleagues.

Blood-based measures that predict amyloid-beta burden in preclinical Alzheimer’s disease have the potential to help investigators conduct clinical trials and aid in diagnostic management. However, this novel approach needs to be validated and translated “to a simpler automated platform suitable for wider utility,” the investigators noted. In addition, it is unclear whether their classifier can track changes in amyloid-beta or differentiate between other diseases with amyloid-beta pathology.

Advances in mass spectrometry technology have renewed interest in the analysis of plasma proteins in patients with various diseases. To assess whether proteomic discovery in plasma can help predict amyloid-beta burden in preclinical Alzheimer’s disease, Dr. Ashton and his colleagues studied 238 cognitively unimpaired individuals from the Australian Imaging, Biomarker and Lifestyle Flagship Study of Ageing (AIBL) and the Kerr Anglican Retirement Village Initiative in Ageing Health (KARVIAH). The participants had undergone PET to determine their amyloid-beta status. In the AIBL cohort (n = 144), 100 participants were amyloid-beta negative, and 44 were amyloid-beta positive. In the KARVIAH cohort (n = 94), 59 participants were amyloid-beta negative, and 35 were amyloid-beta positive. There were significantly more APOE4 carriers in the amyloid-beta–positive groups than in the amyloid-beta–negative groups. In addition, the amyloid-beta–positive groups tended to be older.

A support vector machine analysis created classifiers predicting amyloid-beta positivity in the AIBL cohort using demographics, proteins, or both. The researchers then tested each classifier in the KARVIAH dataset to identify which model best predicted amyloid-beta positivity. The optimal model included 10 protein features (prothrombin, adhesion G protein–coupled receptor, amyloid-beta A4 protein, NGN2, DNAH10, REST, NfL, RPS6KA3, GPSM2, FHAD1) and two demographic features (APOE4 count and age).

The classifier achieved a testing area under the receiver operator characteristic curve of 0.891 in the KARVIAH cohort to predict amyloid-beta positivity in cognitively unimpaired individuals with a sensitivity of 0.78 and specificity of 0.77.

The 10 protein features “represent a diverse array of pathways,” and the highest ranked feature was the serine protease prothrombin, which is a precursor to thrombin, the authors noted. “Multiple lines of evidence support that cerebrovascular disease may play a role in AD and that amyloid-beta may be involved in thrombosis, fibrinolysis, and inflammation via its interaction with the coagulation cascade,” the researchers wrote.

Two of the biomarkers – amyloid-beta A4 protein and NfL – have been examined in prior research and had a greater effect size in a secondary analysis that included participants with mild cognitive impairment and Alzheimer’s disease. This finding confirms “their connection with the more established disease state,” Dr. Ashton and colleagues said. In the secondary analysis, the optimal classifier included one demographic factor (APOE4 count) and nine protein features, eight of which also were used in the cognitively unimpaired classifier.

The study was funded in part by the National Institute for Health Research Biomedical Research Centre at South London and Maudsley NHS Foundation Trust and King’s College London, and many authors reported additional research support from various institutions. One author is an employee of Johnson & Johnson and a named inventor on unrelated biomarker intellectual property owned by Proteome Science and King’s College London.

jremaly@mdedge.com

SOURCE: Ashton NJ et al. Sci Adv. 2019 Feb 6. doi: 10.1126/sciadv.aau7220.

Statin therapy appears to reduce the risk of major vascular events for patients of all age groups, but there is less evidence that older patients with evidence of occlusive vascular disease benefit from the treatment, according to a recent meta-analysis of 28 trials from the Cholesterol Treatment Trialists’ Collaboration published in The Lancet.

Louise Koenig/MDedge News

Statins are “useful and affordable drug[s] that reduce heart attacks and strokes in older patients. Until now there has been an evidence gap and we wanted to look at their efficacy and safety in older people,” Jordan Fulcher, BSc (Med), MBBS, from the Cholesterol Treatment Trialists’ (CTT) Collaboration and the University of Sydney stated in a press release. “Our analysis indicates that major cardiovascular events were reduced by about a fifth, per mmol/L lower LDL cholesterol, by statin therapy across all age groups. Despite previous concerns, we found no adverse effect on cancer or nonvascular mortality in any age group.”

The researchers examined 186,854 participants from 28 CTT trials undergoing statin therapy, of whom 14,483 (8%) were older than 75 years. Patients were divided into six groups based on age and examined the risk of major cardiovascular events such as stroke, coronary revascularization and major coronary events, as well as the incidence of cancer and vascular mortality.

Among all age groups, there was a significant reduction in major vascular events, with a 21% proportional per 1.0-mmol/L reduction in LDL cholesterol (risk ratio, 0.79; 95% confidence interval, 0.77-0.81) among patients receiving statin therapy or a more intensive statin regimen, and there was a 24% proportional reduction (RR, 0.76; 95% CI, 0.73-0.79) of major coronary events per 1.0-mmol/L reduction in LDL cholesterol, with older age resulting in a lower proportional reduction of major coronary events (P = .009). The researchers also found a proportional reduction of coronary revascularization procedures by 25% (RR, 0.75; 95% CI, 0.73-0.78) and stroke by 16% (RR, 0.84; 95% CI, 0.80-0.89) among patients of any age group receiving statin therapy or more intensive statin regimen, with no significant differences between age groups.

There was a 12% proportional reduction in vascular mortality per 1.0-mmol/L reduction in LDL cholesterol (RR, 0.88; 95% CI, 0.85-0.91), but this statistic did not remain significant after the researchers excluded four trials that included patients with heart failure or who were receiving renal dialysis. After excluding these trials from the overall analysis, the researchers found the smaller proportional reductions persisted for older patients for major coronary events (P = .01) but was no longer significant for major vascular events.

The researchers noted their study was limited by the highly selected patient population, low percentage of patients older than 75 years, including trials with efficacy endpoints where some nonserious adverse events may not have been recorded, and not including some trials in the meta-analysis if they were not part of the CTT.

This study was funded by Australian National Health and Medical Research Council, National Institute for Health Research Oxford Biomedical Research Centre, UK Medical Research Council, and British Heart Foundation. The authors have reported personal fees, grants, and consulting fees from Abbott, Aegerion, Amgen, Arisaph, AstraZeneca, Bayer, Beckmann, Berlin-Chemie, Boehringer Ingelheim, Daiichi Sankyo, Dalcor, DuPont, Esperion, GlaxoSmithKline, ISIS Pharmaceuticals, Kowa, Mylan, Pfizer, Roche, Sanofi, Singulex, The Medicines Company, and Vatera Capital, as well as the British Heart Foundation, Cancer Research UK, National Institute for Health Research Oxford Biomedical Research Centre, Medical Research Council, Nuffield Department of Population Health, Weill Cornell Medicine, and UK Biobank.

SOURCE: Fulcher J et al. Lancet. 2019;393:407-15.

Statin therapy appears to reduce the risk of major vascular events for patients of all age groups, but there is less evidence that older patients with evidence of occlusive vascular disease benefit from the treatment, according to a recent meta-analysis of 28 trials from the Cholesterol Treatment Trialists’ Collaboration published in The Lancet.

Louise Koenig/MDedge News

Statins are “useful and affordable drug[s] that reduce heart attacks and strokes in older patients. Until now there has been an evidence gap and we wanted to look at their efficacy and safety in older people,” Jordan Fulcher, BSc (Med), MBBS, from the Cholesterol Treatment Trialists’ (CTT) Collaboration and the University of Sydney stated in a press release. “Our analysis indicates that major cardiovascular events were reduced by about a fifth, per mmol/L lower LDL cholesterol, by statin therapy across all age groups. Despite previous concerns, we found no adverse effect on cancer or nonvascular mortality in any age group.”

The researchers examined 186,854 participants from 28 CTT trials undergoing statin therapy, of whom 14,483 (8%) were older than 75 years. Patients were divided into six groups based on age and examined the risk of major cardiovascular events such as stroke, coronary revascularization and major coronary events, as well as the incidence of cancer and vascular mortality.

Among all age groups, there was a significant reduction in major vascular events, with a 21% proportional per 1.0-mmol/L reduction in LDL cholesterol (risk ratio, 0.79; 95% confidence interval, 0.77-0.81) among patients receiving statin therapy or a more intensive statin regimen, and there was a 24% proportional reduction (RR, 0.76; 95% CI, 0.73-0.79) of major coronary events per 1.0-mmol/L reduction in LDL cholesterol, with older age resulting in a lower proportional reduction of major coronary events (P = .009). The researchers also found a proportional reduction of coronary revascularization procedures by 25% (RR, 0.75; 95% CI, 0.73-0.78) and stroke by 16% (RR, 0.84; 95% CI, 0.80-0.89) among patients of any age group receiving statin therapy or more intensive statin regimen, with no significant differences between age groups.

There was a 12% proportional reduction in vascular mortality per 1.0-mmol/L reduction in LDL cholesterol (RR, 0.88; 95% CI, 0.85-0.91), but this statistic did not remain significant after the researchers excluded four trials that included patients with heart failure or who were receiving renal dialysis. After excluding these trials from the overall analysis, the researchers found the smaller proportional reductions persisted for older patients for major coronary events (P = .01) but was no longer significant for major vascular events.

The researchers noted their study was limited by the highly selected patient population, low percentage of patients older than 75 years, including trials with efficacy endpoints where some nonserious adverse events may not have been recorded, and not including some trials in the meta-analysis if they were not part of the CTT.

This study was funded by Australian National Health and Medical Research Council, National Institute for Health Research Oxford Biomedical Research Centre, UK Medical Research Council, and British Heart Foundation. The authors have reported personal fees, grants, and consulting fees from Abbott, Aegerion, Amgen, Arisaph, AstraZeneca, Bayer, Beckmann, Berlin-Chemie, Boehringer Ingelheim, Daiichi Sankyo, Dalcor, DuPont, Esperion, GlaxoSmithKline, ISIS Pharmaceuticals, Kowa, Mylan, Pfizer, Roche, Sanofi, Singulex, The Medicines Company, and Vatera Capital, as well as the British Heart Foundation, Cancer Research UK, National Institute for Health Research Oxford Biomedical Research Centre, Medical Research Council, Nuffield Department of Population Health, Weill Cornell Medicine, and UK Biobank.

SOURCE: Fulcher J et al. Lancet. 2019;393:407-15.

Statin therapy appears to reduce the risk of major vascular events for patients of all age groups, but there is less evidence that older patients with evidence of occlusive vascular disease benefit from the treatment, according to a recent meta-analysis of 28 trials from the Cholesterol Treatment Trialists’ Collaboration published in The Lancet.

Louise Koenig/MDedge News

Statins are “useful and affordable drug[s] that reduce heart attacks and strokes in older patients. Until now there has been an evidence gap and we wanted to look at their efficacy and safety in older people,” Jordan Fulcher, BSc (Med), MBBS, from the Cholesterol Treatment Trialists’ (CTT) Collaboration and the University of Sydney stated in a press release. “Our analysis indicates that major cardiovascular events were reduced by about a fifth, per mmol/L lower LDL cholesterol, by statin therapy across all age groups. Despite previous concerns, we found no adverse effect on cancer or nonvascular mortality in any age group.”

The researchers examined 186,854 participants from 28 CTT trials undergoing statin therapy, of whom 14,483 (8%) were older than 75 years. Patients were divided into six groups based on age and examined the risk of major cardiovascular events such as stroke, coronary revascularization and major coronary events, as well as the incidence of cancer and vascular mortality.

Among all age groups, there was a significant reduction in major vascular events, with a 21% proportional per 1.0-mmol/L reduction in LDL cholesterol (risk ratio, 0.79; 95% confidence interval, 0.77-0.81) among patients receiving statin therapy or a more intensive statin regimen, and there was a 24% proportional reduction (RR, 0.76; 95% CI, 0.73-0.79) of major coronary events per 1.0-mmol/L reduction in LDL cholesterol, with older age resulting in a lower proportional reduction of major coronary events (P = .009). The researchers also found a proportional reduction of coronary revascularization procedures by 25% (RR, 0.75; 95% CI, 0.73-0.78) and stroke by 16% (RR, 0.84; 95% CI, 0.80-0.89) among patients of any age group receiving statin therapy or more intensive statin regimen, with no significant differences between age groups.

There was a 12% proportional reduction in vascular mortality per 1.0-mmol/L reduction in LDL cholesterol (RR, 0.88; 95% CI, 0.85-0.91), but this statistic did not remain significant after the researchers excluded four trials that included patients with heart failure or who were receiving renal dialysis. After excluding these trials from the overall analysis, the researchers found the smaller proportional reductions persisted for older patients for major coronary events (P = .01) but was no longer significant for major vascular events.

The researchers noted their study was limited by the highly selected patient population, low percentage of patients older than 75 years, including trials with efficacy endpoints where some nonserious adverse events may not have been recorded, and not including some trials in the meta-analysis if they were not part of the CTT.

This study was funded by Australian National Health and Medical Research Council, National Institute for Health Research Oxford Biomedical Research Centre, UK Medical Research Council, and British Heart Foundation. The authors have reported personal fees, grants, and consulting fees from Abbott, Aegerion, Amgen, Arisaph, AstraZeneca, Bayer, Beckmann, Berlin-Chemie, Boehringer Ingelheim, Daiichi Sankyo, Dalcor, DuPont, Esperion, GlaxoSmithKline, ISIS Pharmaceuticals, Kowa, Mylan, Pfizer, Roche, Sanofi, Singulex, The Medicines Company, and Vatera Capital, as well as the British Heart Foundation, Cancer Research UK, National Institute for Health Research Oxford Biomedical Research Centre, Medical Research Council, Nuffield Department of Population Health, Weill Cornell Medicine, and UK Biobank.

SOURCE: Fulcher J et al. Lancet. 2019;393:407-15.

Here are 5 articles from the February issue of Clinician Reviews (individual articles are valid for one year from date of publication—expiration dates below):

1. Short-term lung function better predicts mortality risk in SSc

To take the posttest, go to: https://bit.ly/2RrRuIY
Expires November 26, 2019

2. Healthier lifestyle in midlife women reduces subclinical carotid atherosclerosis

To take the posttest, go to: https://bit.ly/2TvDH5G
Expires November 28, 2019

3. Three commonly used quick cognitive assessments often yield flawed results

To take the posttest, go to: https://bit.ly/2G1qkHn
Expires November 28, 2019

4. Missed HIV screening opportunities found among subsequently infected youth

To take the posttest, go to: https://bit.ly/2HGa8Nm
Expires November 29, 2019

5. Aspirin appears underused to prevent preeclampsia in SLE patients

To take the posttest, go to: https://bit.ly/2G0dU2v
Expires January 2, 2019

Here are 5 articles from the February issue of Clinician Reviews (individual articles are valid for one year from date of publication—expiration dates below):

1. Short-term lung function better predicts mortality risk in SSc

To take the posttest, go to: https://bit.ly/2RrRuIY
Expires November 26, 2019

2. Healthier lifestyle in midlife women reduces subclinical carotid atherosclerosis

To take the posttest, go to: https://bit.ly/2TvDH5G
Expires November 28, 2019

3. Three commonly used quick cognitive assessments often yield flawed results

To take the posttest, go to: https://bit.ly/2G1qkHn
Expires November 28, 2019

4. Missed HIV screening opportunities found among subsequently infected youth

To take the posttest, go to: https://bit.ly/2HGa8Nm
Expires November 29, 2019

5. Aspirin appears underused to prevent preeclampsia in SLE patients

To take the posttest, go to: https://bit.ly/2G0dU2v
Expires January 2, 2019

Here are 5 articles from the February issue of Clinician Reviews (individual articles are valid for one year from date of publication—expiration dates below):

1. Short-term lung function better predicts mortality risk in SSc

To take the posttest, go to: https://bit.ly/2RrRuIY
Expires November 26, 2019

2. Healthier lifestyle in midlife women reduces subclinical carotid atherosclerosis

To take the posttest, go to: https://bit.ly/2TvDH5G
Expires November 28, 2019

3. Three commonly used quick cognitive assessments often yield flawed results

To take the posttest, go to: https://bit.ly/2G1qkHn
Expires November 28, 2019

4. Missed HIV screening opportunities found among subsequently infected youth

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Expires November 29, 2019

5. Aspirin appears underused to prevent preeclampsia in SLE patients

To take the posttest, go to: https://bit.ly/2G0dU2v
Expires January 2, 2019

Whether subclinical hypothyroidism is clinically important and should be treated remains controversial. Studies have differed in their findings, and although most have found this condition to be associated with a variety of adverse outcomes, large randomized controlled trials are needed to clearly demonstrate its clinical impact in various age groups and the benefit of levothyroxine therapy.

Currently, the best practical approach is to base treatment decisions on the magnitude of elevation of thyroid-stimulating hormone (TSH) and whether the patient has thyroid autoantibodies and associated comorbid conditions.

HIGH TSH, NORMAL FREE T₄ LEVELS

Subclinical hypothyroidism is defined by elevated TSH along with a normal free thyroxine (T₄).¹

The hypothalamic-pituitary-thyroid axis is a balanced homeostatic system, and TSH and thyroid hormone levels have an inverse log-linear relation: if free T₄ and triiodothyronine (T₃) levels go down even a little, TSH levels go up a lot.²

TSH secretion is pulsatile and has a circadian rhythm: serum TSH levels are 50% higher at night and early in the morning than during the rest of the day. Thus, repeated measurements in the same patient can vary by as much as half of the reference range.³

WHAT IS THE UPPER LIMIT OF NORMAL FOR TSH?

The upper limit of normal for TSH, defined as the 97.5th percentile, is approximately 4 or 5 mIU/L depending on the laboratory and the population, but some experts believe it should be lower.³

In favor of a lower upper limit: the distribution of serum TSH levels in the healthy general population does not seem to be a typical bell-shaped Gaussian curve, but rather has a tail at the high end. Some argue that some of the individuals with values in the upper end of the normal range may actually have undiagnosed hypothyroidism and that the upper 97.5th percentile cutoff would be 2.5 mIU/L if these people were excluded.⁴ Also, TSH levels higher than 2.5 mIU/L have been associated with a higher prevalence of antithyroid antibodies and a higher risk of clinical hypothyroidism.⁵

On the other hand, lowering the upper limit of normal to 2.5 mIU/L would result in 4 times as many people receiving a diagnosis of subclinical hypothyroidism, or 22 to 28 million people in the United States.^4,6 Thus, lowering the cutoff may lead to unnecessary therapy and could even harm from overtreatment.

Another argument against lowering the upper limit of normal for TSH is that, with age, serum TSH levels shift higher.⁷ The third National Health and Nutrition Education Survey (NHANES III) found that the 97.5th percentile for serum TSH was 3.56 mIU/L for age group 20 to 29 but 7.49 mIU/L for octogenarians.^7,8

It has been suggested that the upper limit of normal for TSH be adjusted for age, race, sex, and iodine intake.³ Currently available TSH reference ranges are not adjusted for these variables, and there is not enough evidence to suggest age-appropriate ranges,⁹ although higher TSH cutoffs for treatment are advised in elderly patients.¹⁰ Interestingly, higher TSH in older people has been linked to lower mortality rates in some studies.¹¹

Authors of the NHANES III⁸ and Hanford Thyroid Disease study¹² have proposed a cutoff of 4.1 mIU/L for the upper limit of normal for serum TSH in patients with negative antithyroid antibodies and normal findings on thyroid ultrasonography.

SUBCLINICAL HYPOTHYROIDISM IS COMMON

In different studies, the prevalence of subclinical hypothyroidism has been as low as 4% and as high as 20%.^1,8,13 The prevalence is higher in women and increases with age.⁸ It is higher in iodine-sufficient areas, and it increases in iodine-deficient areas with iodine supplementation.¹⁴ Genetics also plays a role, as subclinical hypothyroidism is more common in white people than in African Americans.⁸

A difficulty in estimating the prevalence is the disagreement about the cutoff for TSH, which may differ from that in the general population in certain subgroups such as adolescents, the elderly, and pregnant women.^10,15

A VARIETY OF CAUSES

The most common cause of subclinical hypothyroidism, accounting for 60% to 80% of cases, is Hashimoto (autoimmune) thyroiditis,² in which thyroid peroxidase antibodies are usually present.^2,16

Also important to rule out are false-positive elevations due to substances that interfere with TSH assays (eg, heterophile antibodies, rheumatoid factor, biotin, macro-TSH); reversible causes such as the recovery phase of euthyroid sick syndrome; subacute, painless, or postpartum thyroiditis; central hypo- or hyperthyroidism; and thyroid hormone resistance.

SUBCLINICAL HYPOTHYROIDISM CAN RESOLVE OR PROGRESS 


“Subclinical” suggests that the disease is in its early stage, with changes in TSH already apparent but decreases in thyroid hormone levels yet to come.¹⁷ And indeed, subclinical hypothyroidism can progress to overt hypothyroidism,¹⁸ although it has been reported to resolve spontaneously in half of cases within 2 years,¹⁹ typically in patients with TSH values of 4 to 6 mIU/L.²⁰ The rate of progression to overt hypothyroidism is estimated to be 33% to 55% over 10 to 20 years of follow-up.¹⁸

Figure 1 shows the natural history of subclinical hypothyroidism.¹

GUIDELINES FOR SCREENING DIFFER

Guidelines differ on screening for thyroid disease in the general population, owing to lack of large-scale randomized controlled trials showing treatment benefit in otherwise-healthy people with mildly elevated TSH values.

Various professional societies have adopted different criteria for aggressive case-finding in patients at risk of thyroid disease. Risk factors include family history of thyroid disease, neck irradiation, partial thyroidectomy, dyslipidemia, atrial fibrillation, unexplained weight loss, hyperprolactinemia, autoimmune disorders, and use of medications affecting thyroid function.²³

The US Preventive Services Task Force in 2014 found insufficient evidence on the benefits and harms of screening.²⁴

The American Thyroid Association (ATA) recommends screening adults starting at age 35, with repeat testing every 5 years in patients who have no signs or symptoms of hypothyroidism, and more frequently in those who do.²⁵

The American Association of Clinical Endocrinologists recommends screening in women and older patients. Their guidelines and those of the ATA also suggest screening people at high risk of thyroid disease due to risk factors such as history of autoimmune diseases, neck irradiation, or medications affecting thyroid function.²⁶

The American Academy of Family Physicians recommends screening after age 60.¹⁸

The American College of Physicians recommends screening patients over age 50 who have symptoms.¹⁸

Our approach. Although evidence is lacking to recommend routine screening in adults, aggressive case-finding and treatment in patients at risk of thyroid disease can, we believe, offset the risks associated with subclinical hypothyroidism.²⁴

CLINICAL PRESENTATION

About 70% of patients with subclinical hypothyroidism have no symptoms.¹³

Tiredness was more common in subclinical hypothyroid patients with TSH levels lower than 10 mIU/L compared with euthyroid controls in 1 study, but other studies have been unable to replicate this finding.^27,28

Other frequently reported symptoms include dry skin, cognitive slowing, poor memory, muscle weakness, cold intolerance, constipation, puffy eyes, and hoarseness.¹³

The evidence in favor of levothyroxine therapy to improve symptoms in subclinical hypothyroidism has varied, with some studies showing an improvement in symptom scores compared with placebo, while others have not shown any benefit.^29–31

In one study, the average TSH value for patients whose symptoms did not improve with therapy was 4.6 mIU/L.³¹ An explanation for the lack of effect in this group may be that the TSH values for these patients were in the high-normal range. Also, because most subclinical hypothyroid patients have no symptoms, it is difficult to ascertain symptomatic improvement. Though it is possible to conclude that levothyroxine therapy has a limited role in this group, it is important to also consider the suggestive evidence that untreated subclinical hypothyroidism may lead to increased morbidity and mortality.

ADVERSE EFFECTS OF SUBCLINICAL HYPOTHYROIDISM, EFFECTS OF THERAPY

INDIVIDUALIZED MANAGEMENT AND SHARED DECISION-MAKING

The management of subclinical hypothyroidism should be individualized on the basis of extent of thyroid dysfunction, comorbid conditions, risk factors, and patient preference.¹¹⁸ Shared decision-making is key, weighing the risks and benefits of levothyroxine treatment and the patient’s goals.

The risks of treatment should be kept in mind and explained to the patient. Levothyroxine has a narrow therapeutic range, causing a possibility of overreplacement, and a half-life of 7 days that can cause dosing errors to have longer effect.^118,119

Adherence can be a challenge. The drug needs to be taken on an empty stomach because foods and supplements interfere with its absorption.^118,120 In addition, the cost of medication, frequent biochemical monitoring, and possible need for titration can add to financial burden.

When choosing the dose, one should consider the degree of hypothyroidism or TSH elevation and the patient’s weight, and adjust the dose gently.

If the TSH is high-normal

It is proposed that a TSH range of 3 to 5 mIU/L overlaps with normal thyroid function in a great segment of the population, and at this level it is probably not associated with clinically significant consequences. For these reasons, levothyroxine therapy is not thought to be beneficial for those with TSH in this range.

Pollock et al¹²¹ found that, in patients with symptoms suggesting hypothyroidism and TSH values in the upper end of the normal range, there was no improvement in cognitive function or psychological well-being after 12 weeks of levothyroxine therapy.

However, due to the concern for possible adverse maternal and fetal outcomes and low IQ in children of pregnant patients with subclinical hypothyroidism, levothyroxine therapy is advised in those who are pregnant or planning pregnancy who have TSH levels higher than 2.5 mIU/L, especially if they have thyroid peroxidase antibody. Levothyroxine therapy is not recommended for pregnant patients with negative thyroid peroxidase antibody and TSH within the pregnancy-specific range or less than 4 mIU/L if the reference ranges are unavailable.

Keep in mind that, even at these TSH values, there is risk of progression to overt hypothyroidism, especially in the presence of thyroid peroxidase antibody, so patients in this group should be monitored closely.

If TSH is mildly elevated

The evidence to support levothyroxine therapy in patients with subclinical hypothyroidism with TSH levels less than 10 mIU/L remains inconclusive, and the decision to treat should be based on clinical judgment.² The studies that have looked at the benefit of treating subclinical hypothyroidism in terms of cardiac, neuromuscular, cognitive, and neuropsychiatric outcomes have included patients with a wide range of TSH levels, and some of these studies were not stratified on the basis of degree of TSH elevation.

The risk that subclinical hypothyroidism will progress to overt hypothyroidism in patients with TSH higher than 8 mIU/L is high, and in 70% of these patients, the TSH level rises to more than 10 mIU/L within 4 years. Early treatment should be considered if the TSH is higher than 7 or 8 mIU/L.

If TSH is higher than 10 mIU/L

Figure 2 outlines an algorithmic approach to subclinical hypothyroidism in nonpregnant patients as suggested by Peeters.¹²²

Whether subclinical hypothyroidism is clinically important and should be treated remains controversial. Studies have differed in their findings, and although most have found this condition to be associated with a variety of adverse outcomes, large randomized controlled trials are needed to clearly demonstrate its clinical impact in various age groups and the benefit of levothyroxine therapy.

Currently, the best practical approach is to base treatment decisions on the magnitude of elevation of thyroid-stimulating hormone (TSH) and whether the patient has thyroid autoantibodies and associated comorbid conditions.

HIGH TSH, NORMAL FREE T₄ LEVELS

Subclinical hypothyroidism is defined by elevated TSH along with a normal free thyroxine (T₄).¹

The hypothalamic-pituitary-thyroid axis is a balanced homeostatic system, and TSH and thyroid hormone levels have an inverse log-linear relation: if free T₄ and triiodothyronine (T₃) levels go down even a little, TSH levels go up a lot.²

TSH secretion is pulsatile and has a circadian rhythm: serum TSH levels are 50% higher at night and early in the morning than during the rest of the day. Thus, repeated measurements in the same patient can vary by as much as half of the reference range.³

WHAT IS THE UPPER LIMIT OF NORMAL FOR TSH?

The upper limit of normal for TSH, defined as the 97.5th percentile, is approximately 4 or 5 mIU/L depending on the laboratory and the population, but some experts believe it should be lower.³

In favor of a lower upper limit: the distribution of serum TSH levels in the healthy general population does not seem to be a typical bell-shaped Gaussian curve, but rather has a tail at the high end. Some argue that some of the individuals with values in the upper end of the normal range may actually have undiagnosed hypothyroidism and that the upper 97.5th percentile cutoff would be 2.5 mIU/L if these people were excluded.⁴ Also, TSH levels higher than 2.5 mIU/L have been associated with a higher prevalence of antithyroid antibodies and a higher risk of clinical hypothyroidism.⁵

On the other hand, lowering the upper limit of normal to 2.5 mIU/L would result in 4 times as many people receiving a diagnosis of subclinical hypothyroidism, or 22 to 28 million people in the United States.^4,6 Thus, lowering the cutoff may lead to unnecessary therapy and could even harm from overtreatment.

Another argument against lowering the upper limit of normal for TSH is that, with age, serum TSH levels shift higher.⁷ The third National Health and Nutrition Education Survey (NHANES III) found that the 97.5th percentile for serum TSH was 3.56 mIU/L for age group 20 to 29 but 7.49 mIU/L for octogenarians.^7,8

It has been suggested that the upper limit of normal for TSH be adjusted for age, race, sex, and iodine intake.³ Currently available TSH reference ranges are not adjusted for these variables, and there is not enough evidence to suggest age-appropriate ranges,⁹ although higher TSH cutoffs for treatment are advised in elderly patients.¹⁰ Interestingly, higher TSH in older people has been linked to lower mortality rates in some studies.¹¹

Authors of the NHANES III⁸ and Hanford Thyroid Disease study¹² have proposed a cutoff of 4.1 mIU/L for the upper limit of normal for serum TSH in patients with negative antithyroid antibodies and normal findings on thyroid ultrasonography.

SUBCLINICAL HYPOTHYROIDISM IS COMMON

In different studies, the prevalence of subclinical hypothyroidism has been as low as 4% and as high as 20%.^1,8,13 The prevalence is higher in women and increases with age.⁸ It is higher in iodine-sufficient areas, and it increases in iodine-deficient areas with iodine supplementation.¹⁴ Genetics also plays a role, as subclinical hypothyroidism is more common in white people than in African Americans.⁸

A difficulty in estimating the prevalence is the disagreement about the cutoff for TSH, which may differ from that in the general population in certain subgroups such as adolescents, the elderly, and pregnant women.^10,15

A VARIETY OF CAUSES

The most common cause of subclinical hypothyroidism, accounting for 60% to 80% of cases, is Hashimoto (autoimmune) thyroiditis,² in which thyroid peroxidase antibodies are usually present.^2,16

Also important to rule out are false-positive elevations due to substances that interfere with TSH assays (eg, heterophile antibodies, rheumatoid factor, biotin, macro-TSH); reversible causes such as the recovery phase of euthyroid sick syndrome; subacute, painless, or postpartum thyroiditis; central hypo- or hyperthyroidism; and thyroid hormone resistance.

SUBCLINICAL HYPOTHYROIDISM CAN RESOLVE OR PROGRESS 


“Subclinical” suggests that the disease is in its early stage, with changes in TSH already apparent but decreases in thyroid hormone levels yet to come.¹⁷ And indeed, subclinical hypothyroidism can progress to overt hypothyroidism,¹⁸ although it has been reported to resolve spontaneously in half of cases within 2 years,¹⁹ typically in patients with TSH values of 4 to 6 mIU/L.²⁰ The rate of progression to overt hypothyroidism is estimated to be 33% to 55% over 10 to 20 years of follow-up.¹⁸

Figure 1 shows the natural history of subclinical hypothyroidism.¹

GUIDELINES FOR SCREENING DIFFER

Guidelines differ on screening for thyroid disease in the general population, owing to lack of large-scale randomized controlled trials showing treatment benefit in otherwise-healthy people with mildly elevated TSH values.

Various professional societies have adopted different criteria for aggressive case-finding in patients at risk of thyroid disease. Risk factors include family history of thyroid disease, neck irradiation, partial thyroidectomy, dyslipidemia, atrial fibrillation, unexplained weight loss, hyperprolactinemia, autoimmune disorders, and use of medications affecting thyroid function.²³

The US Preventive Services Task Force in 2014 found insufficient evidence on the benefits and harms of screening.²⁴

The American Thyroid Association (ATA) recommends screening adults starting at age 35, with repeat testing every 5 years in patients who have no signs or symptoms of hypothyroidism, and more frequently in those who do.²⁵

The American Association of Clinical Endocrinologists recommends screening in women and older patients. Their guidelines and those of the ATA also suggest screening people at high risk of thyroid disease due to risk factors such as history of autoimmune diseases, neck irradiation, or medications affecting thyroid function.²⁶

The American Academy of Family Physicians recommends screening after age 60.¹⁸

The American College of Physicians recommends screening patients over age 50 who have symptoms.¹⁸

Our approach. Although evidence is lacking to recommend routine screening in adults, aggressive case-finding and treatment in patients at risk of thyroid disease can, we believe, offset the risks associated with subclinical hypothyroidism.²⁴

CLINICAL PRESENTATION

About 70% of patients with subclinical hypothyroidism have no symptoms.¹³

Tiredness was more common in subclinical hypothyroid patients with TSH levels lower than 10 mIU/L compared with euthyroid controls in 1 study, but other studies have been unable to replicate this finding.^27,28

Other frequently reported symptoms include dry skin, cognitive slowing, poor memory, muscle weakness, cold intolerance, constipation, puffy eyes, and hoarseness.¹³

The evidence in favor of levothyroxine therapy to improve symptoms in subclinical hypothyroidism has varied, with some studies showing an improvement in symptom scores compared with placebo, while others have not shown any benefit.^29–31

In one study, the average TSH value for patients whose symptoms did not improve with therapy was 4.6 mIU/L.³¹ An explanation for the lack of effect in this group may be that the TSH values for these patients were in the high-normal range. Also, because most subclinical hypothyroid patients have no symptoms, it is difficult to ascertain symptomatic improvement. Though it is possible to conclude that levothyroxine therapy has a limited role in this group, it is important to also consider the suggestive evidence that untreated subclinical hypothyroidism may lead to increased morbidity and mortality.

ADVERSE EFFECTS OF SUBCLINICAL HYPOTHYROIDISM, EFFECTS OF THERAPY

INDIVIDUALIZED MANAGEMENT AND SHARED DECISION-MAKING

The management of subclinical hypothyroidism should be individualized on the basis of extent of thyroid dysfunction, comorbid conditions, risk factors, and patient preference.¹¹⁸ Shared decision-making is key, weighing the risks and benefits of levothyroxine treatment and the patient’s goals.

The risks of treatment should be kept in mind and explained to the patient. Levothyroxine has a narrow therapeutic range, causing a possibility of overreplacement, and a half-life of 7 days that can cause dosing errors to have longer effect.^118,119

Adherence can be a challenge. The drug needs to be taken on an empty stomach because foods and supplements interfere with its absorption.^118,120 In addition, the cost of medication, frequent biochemical monitoring, and possible need for titration can add to financial burden.

When choosing the dose, one should consider the degree of hypothyroidism or TSH elevation and the patient’s weight, and adjust the dose gently.

If the TSH is high-normal

It is proposed that a TSH range of 3 to 5 mIU/L overlaps with normal thyroid function in a great segment of the population, and at this level it is probably not associated with clinically significant consequences. For these reasons, levothyroxine therapy is not thought to be beneficial for those with TSH in this range.

Pollock et al¹²¹ found that, in patients with symptoms suggesting hypothyroidism and TSH values in the upper end of the normal range, there was no improvement in cognitive function or psychological well-being after 12 weeks of levothyroxine therapy.

However, due to the concern for possible adverse maternal and fetal outcomes and low IQ in children of pregnant patients with subclinical hypothyroidism, levothyroxine therapy is advised in those who are pregnant or planning pregnancy who have TSH levels higher than 2.5 mIU/L, especially if they have thyroid peroxidase antibody. Levothyroxine therapy is not recommended for pregnant patients with negative thyroid peroxidase antibody and TSH within the pregnancy-specific range or less than 4 mIU/L if the reference ranges are unavailable.

Keep in mind that, even at these TSH values, there is risk of progression to overt hypothyroidism, especially in the presence of thyroid peroxidase antibody, so patients in this group should be monitored closely.

If TSH is mildly elevated

The evidence to support levothyroxine therapy in patients with subclinical hypothyroidism with TSH levels less than 10 mIU/L remains inconclusive, and the decision to treat should be based on clinical judgment.² The studies that have looked at the benefit of treating subclinical hypothyroidism in terms of cardiac, neuromuscular, cognitive, and neuropsychiatric outcomes have included patients with a wide range of TSH levels, and some of these studies were not stratified on the basis of degree of TSH elevation.

The risk that subclinical hypothyroidism will progress to overt hypothyroidism in patients with TSH higher than 8 mIU/L is high, and in 70% of these patients, the TSH level rises to more than 10 mIU/L within 4 years. Early treatment should be considered if the TSH is higher than 7 or 8 mIU/L.

If TSH is higher than 10 mIU/L

Figure 2 outlines an algorithmic approach to subclinical hypothyroidism in nonpregnant patients as suggested by Peeters.¹²²

Whether subclinical hypothyroidism is clinically important and should be treated remains controversial. Studies have differed in their findings, and although most have found this condition to be associated with a variety of adverse outcomes, large randomized controlled trials are needed to clearly demonstrate its clinical impact in various age groups and the benefit of levothyroxine therapy.

Currently, the best practical approach is to base treatment decisions on the magnitude of elevation of thyroid-stimulating hormone (TSH) and whether the patient has thyroid autoantibodies and associated comorbid conditions.

HIGH TSH, NORMAL FREE T₄ LEVELS

Subclinical hypothyroidism is defined by elevated TSH along with a normal free thyroxine (T₄).¹

The hypothalamic-pituitary-thyroid axis is a balanced homeostatic system, and TSH and thyroid hormone levels have an inverse log-linear relation: if free T₄ and triiodothyronine (T₃) levels go down even a little, TSH levels go up a lot.²

TSH secretion is pulsatile and has a circadian rhythm: serum TSH levels are 50% higher at night and early in the morning than during the rest of the day. Thus, repeated measurements in the same patient can vary by as much as half of the reference range.³

WHAT IS THE UPPER LIMIT OF NORMAL FOR TSH?

The upper limit of normal for TSH, defined as the 97.5th percentile, is approximately 4 or 5 mIU/L depending on the laboratory and the population, but some experts believe it should be lower.³

In favor of a lower upper limit: the distribution of serum TSH levels in the healthy general population does not seem to be a typical bell-shaped Gaussian curve, but rather has a tail at the high end. Some argue that some of the individuals with values in the upper end of the normal range may actually have undiagnosed hypothyroidism and that the upper 97.5th percentile cutoff would be 2.5 mIU/L if these people were excluded.⁴ Also, TSH levels higher than 2.5 mIU/L have been associated with a higher prevalence of antithyroid antibodies and a higher risk of clinical hypothyroidism.⁵

On the other hand, lowering the upper limit of normal to 2.5 mIU/L would result in 4 times as many people receiving a diagnosis of subclinical hypothyroidism, or 22 to 28 million people in the United States.^4,6 Thus, lowering the cutoff may lead to unnecessary therapy and could even harm from overtreatment.

Another argument against lowering the upper limit of normal for TSH is that, with age, serum TSH levels shift higher.⁷ The third National Health and Nutrition Education Survey (NHANES III) found that the 97.5th percentile for serum TSH was 3.56 mIU/L for age group 20 to 29 but 7.49 mIU/L for octogenarians.^7,8

It has been suggested that the upper limit of normal for TSH be adjusted for age, race, sex, and iodine intake.³ Currently available TSH reference ranges are not adjusted for these variables, and there is not enough evidence to suggest age-appropriate ranges,⁹ although higher TSH cutoffs for treatment are advised in elderly patients.¹⁰ Interestingly, higher TSH in older people has been linked to lower mortality rates in some studies.¹¹

Authors of the NHANES III⁸ and Hanford Thyroid Disease study¹² have proposed a cutoff of 4.1 mIU/L for the upper limit of normal for serum TSH in patients with negative antithyroid antibodies and normal findings on thyroid ultrasonography.

SUBCLINICAL HYPOTHYROIDISM IS COMMON

In different studies, the prevalence of subclinical hypothyroidism has been as low as 4% and as high as 20%.^1,8,13 The prevalence is higher in women and increases with age.⁸ It is higher in iodine-sufficient areas, and it increases in iodine-deficient areas with iodine supplementation.¹⁴ Genetics also plays a role, as subclinical hypothyroidism is more common in white people than in African Americans.⁸

A difficulty in estimating the prevalence is the disagreement about the cutoff for TSH, which may differ from that in the general population in certain subgroups such as adolescents, the elderly, and pregnant women.^10,15

A VARIETY OF CAUSES

The most common cause of subclinical hypothyroidism, accounting for 60% to 80% of cases, is Hashimoto (autoimmune) thyroiditis,² in which thyroid peroxidase antibodies are usually present.^2,16

Also important to rule out are false-positive elevations due to substances that interfere with TSH assays (eg, heterophile antibodies, rheumatoid factor, biotin, macro-TSH); reversible causes such as the recovery phase of euthyroid sick syndrome; subacute, painless, or postpartum thyroiditis; central hypo- or hyperthyroidism; and thyroid hormone resistance.

SUBCLINICAL HYPOTHYROIDISM CAN RESOLVE OR PROGRESS 


“Subclinical” suggests that the disease is in its early stage, with changes in TSH already apparent but decreases in thyroid hormone levels yet to come.¹⁷ And indeed, subclinical hypothyroidism can progress to overt hypothyroidism,¹⁸ although it has been reported to resolve spontaneously in half of cases within 2 years,¹⁹ typically in patients with TSH values of 4 to 6 mIU/L.²⁰ The rate of progression to overt hypothyroidism is estimated to be 33% to 55% over 10 to 20 years of follow-up.¹⁸

Figure 1 shows the natural history of subclinical hypothyroidism.¹

GUIDELINES FOR SCREENING DIFFER

Guidelines differ on screening for thyroid disease in the general population, owing to lack of large-scale randomized controlled trials showing treatment benefit in otherwise-healthy people with mildly elevated TSH values.

Various professional societies have adopted different criteria for aggressive case-finding in patients at risk of thyroid disease. Risk factors include family history of thyroid disease, neck irradiation, partial thyroidectomy, dyslipidemia, atrial fibrillation, unexplained weight loss, hyperprolactinemia, autoimmune disorders, and use of medications affecting thyroid function.²³

The US Preventive Services Task Force in 2014 found insufficient evidence on the benefits and harms of screening.²⁴

The American Thyroid Association (ATA) recommends screening adults starting at age 35, with repeat testing every 5 years in patients who have no signs or symptoms of hypothyroidism, and more frequently in those who do.²⁵

The American Association of Clinical Endocrinologists recommends screening in women and older patients. Their guidelines and those of the ATA also suggest screening people at high risk of thyroid disease due to risk factors such as history of autoimmune diseases, neck irradiation, or medications affecting thyroid function.²⁶

The American Academy of Family Physicians recommends screening after age 60.¹⁸

The American College of Physicians recommends screening patients over age 50 who have symptoms.¹⁸

Our approach. Although evidence is lacking to recommend routine screening in adults, aggressive case-finding and treatment in patients at risk of thyroid disease can, we believe, offset the risks associated with subclinical hypothyroidism.²⁴

CLINICAL PRESENTATION

About 70% of patients with subclinical hypothyroidism have no symptoms.¹³

Tiredness was more common in subclinical hypothyroid patients with TSH levels lower than 10 mIU/L compared with euthyroid controls in 1 study, but other studies have been unable to replicate this finding.^27,28

Other frequently reported symptoms include dry skin, cognitive slowing, poor memory, muscle weakness, cold intolerance, constipation, puffy eyes, and hoarseness.¹³

The evidence in favor of levothyroxine therapy to improve symptoms in subclinical hypothyroidism has varied, with some studies showing an improvement in symptom scores compared with placebo, while others have not shown any benefit.^29–31

In one study, the average TSH value for patients whose symptoms did not improve with therapy was 4.6 mIU/L.³¹ An explanation for the lack of effect in this group may be that the TSH values for these patients were in the high-normal range. Also, because most subclinical hypothyroid patients have no symptoms, it is difficult to ascertain symptomatic improvement. Though it is possible to conclude that levothyroxine therapy has a limited role in this group, it is important to also consider the suggestive evidence that untreated subclinical hypothyroidism may lead to increased morbidity and mortality.

ADVERSE EFFECTS OF SUBCLINICAL HYPOTHYROIDISM, EFFECTS OF THERAPY

INDIVIDUALIZED MANAGEMENT AND SHARED DECISION-MAKING

The management of subclinical hypothyroidism should be individualized on the basis of extent of thyroid dysfunction, comorbid conditions, risk factors, and patient preference.¹¹⁸ Shared decision-making is key, weighing the risks and benefits of levothyroxine treatment and the patient’s goals.

The risks of treatment should be kept in mind and explained to the patient. Levothyroxine has a narrow therapeutic range, causing a possibility of overreplacement, and a half-life of 7 days that can cause dosing errors to have longer effect.^118,119

Adherence can be a challenge. The drug needs to be taken on an empty stomach because foods and supplements interfere with its absorption.^118,120 In addition, the cost of medication, frequent biochemical monitoring, and possible need for titration can add to financial burden.

When choosing the dose, one should consider the degree of hypothyroidism or TSH elevation and the patient’s weight, and adjust the dose gently.

If the TSH is high-normal

It is proposed that a TSH range of 3 to 5 mIU/L overlaps with normal thyroid function in a great segment of the population, and at this level it is probably not associated with clinically significant consequences. For these reasons, levothyroxine therapy is not thought to be beneficial for those with TSH in this range.

Pollock et al¹²¹ found that, in patients with symptoms suggesting hypothyroidism and TSH values in the upper end of the normal range, there was no improvement in cognitive function or psychological well-being after 12 weeks of levothyroxine therapy.

However, due to the concern for possible adverse maternal and fetal outcomes and low IQ in children of pregnant patients with subclinical hypothyroidism, levothyroxine therapy is advised in those who are pregnant or planning pregnancy who have TSH levels higher than 2.5 mIU/L, especially if they have thyroid peroxidase antibody. Levothyroxine therapy is not recommended for pregnant patients with negative thyroid peroxidase antibody and TSH within the pregnancy-specific range or less than 4 mIU/L if the reference ranges are unavailable.

Keep in mind that, even at these TSH values, there is risk of progression to overt hypothyroidism, especially in the presence of thyroid peroxidase antibody, so patients in this group should be monitored closely.

If TSH is mildly elevated

The evidence to support levothyroxine therapy in patients with subclinical hypothyroidism with TSH levels less than 10 mIU/L remains inconclusive, and the decision to treat should be based on clinical judgment.² The studies that have looked at the benefit of treating subclinical hypothyroidism in terms of cardiac, neuromuscular, cognitive, and neuropsychiatric outcomes have included patients with a wide range of TSH levels, and some of these studies were not stratified on the basis of degree of TSH elevation.

The risk that subclinical hypothyroidism will progress to overt hypothyroidism in patients with TSH higher than 8 mIU/L is high, and in 70% of these patients, the TSH level rises to more than 10 mIU/L within 4 years. Early treatment should be considered if the TSH is higher than 7 or 8 mIU/L.

If TSH is higher than 10 mIU/L

Figure 2 outlines an algorithmic approach to subclinical hypothyroidism in nonpregnant patients as suggested by Peeters.¹²²

At a quick read, the messages from these articles may seem contradictory. But the biology is more complex in the setting of endogenous production of T₄ by the thyroid gland, which is regulated by TSH, which in turn is regulated in a feedback loop by the thyroid-produced T₄. In the setting of a fixed replacement dose of exogenous levothyroxine, the provided hormone affects the pituitary production of TSH, which likely will have no significant subsequent effect on the T₄ level. Thus, the feedback control loop is far simpler.

There has not been a definitive study demonstrating that thyroxine supplementation in patients with subclinical hypothyroidism results in a superior clinical outcome. There are hints that this may be the case, and Azim and Nasr cite some of these studies. Recognizing a few markedly different physiologic reasons why the TSH can be slightly elevated and the T₄ normal helps explain the lack of uniform clinical success with supplementation therapy and provides rationales for some management strategies.

Any biological variability in the responsiveness of the thyroid gland to TSH may affect the relationship between the levels of TSH and thyroid gland-released T₄. In theory, if the thyroid receptor has decreased affinity for TSH, a higher TSH concentration will be needed to get the thyroid gland to secrete the level of T₄ that the pituitary sensing mechanism deems normal for that individual. If the receptor affinity was decreased due to a gene polymorphism, this relationship between TSH and T₄ may be stable, and providing exogenous T₄ will result in a lower, “normalized” TSH level but may disrupt the thyroid-pituitary crosstalk and may even produce clinical hyperthyroidism.

A similar scenario exists in the setting of early thyroid gland failure, such as in Hashimoto thyroiditis. But in the latter scenario, the TSH-to-T₄ production relationship may be unstable over time, for as additional thyroid gland is destroyed, T₄ production will continue to decrease, the TSH will increase, and the thyroid gland may ultimately fail and hypothyroidism will occur. Hence the recommendation that in the setting of subclinical hypothyroidism and antiperoxidase antibodies, T₄ and TSH levels should be monitored regularly in order to detect early true thyroid gland failure when the T₄ level can no longer be maintained despite the increased stimulation of the gland by the elevated TSH. Analogous to this may be subclinical hypothyroidism in the elderly, in whom thyroid gland failure may develop, despite an increased TSH, from senescence rather than autoimmunity. What I am suggesting is that the natural history of all patients with subclinical hypothyroidism is not alike, and it thus should not be surprising that there does not seem to be a one-size-fits-all approach to management.

Symptoms in patients with subclinical hypothyroidism have not uniformly improved with T₄ treatment compared with placebo. Notably, most patients with subclinical hypothyroidism experience no symptoms. But consider the extremely common symptom of fatigue, which can be present for a myriad of defined and undefined reasons. This symptom may often lead physicians to check the TSH and, if that is even slightly elevated, to also check the T₄. It may also lead some physicians to routinely check the T₄. Subclinical hypothyroidism is also quite common; thus, by chance alone or because of the circadian timing of checking the TSH, a slightly elevated TSH and fatigue may coexist and yet be unrelated.

Additionally, a positive biochemical response to thyroxine supplementation, such as a lowering of cholesterol, does not prove that the patient was clinically hypothyroid prior to supplementation, any more than lowering a patient’s blood glucose with insulin proves that the patient was diabetic. The management of subclinical hypothyroidism should be nuanced and based on both clinical and laboratory parameters.

At a quick read, the messages from these articles may seem contradictory. But the biology is more complex in the setting of endogenous production of T₄ by the thyroid gland, which is regulated by TSH, which in turn is regulated in a feedback loop by the thyroid-produced T₄. In the setting of a fixed replacement dose of exogenous levothyroxine, the provided hormone affects the pituitary production of TSH, which likely will have no significant subsequent effect on the T₄ level. Thus, the feedback control loop is far simpler.

There has not been a definitive study demonstrating that thyroxine supplementation in patients with subclinical hypothyroidism results in a superior clinical outcome. There are hints that this may be the case, and Azim and Nasr cite some of these studies. Recognizing a few markedly different physiologic reasons why the TSH can be slightly elevated and the T₄ normal helps explain the lack of uniform clinical success with supplementation therapy and provides rationales for some management strategies.

Any biological variability in the responsiveness of the thyroid gland to TSH may affect the relationship between the levels of TSH and thyroid gland-released T₄. In theory, if the thyroid receptor has decreased affinity for TSH, a higher TSH concentration will be needed to get the thyroid gland to secrete the level of T₄ that the pituitary sensing mechanism deems normal for that individual. If the receptor affinity was decreased due to a gene polymorphism, this relationship between TSH and T₄ may be stable, and providing exogenous T₄ will result in a lower, “normalized” TSH level but may disrupt the thyroid-pituitary crosstalk and may even produce clinical hyperthyroidism.

A similar scenario exists in the setting of early thyroid gland failure, such as in Hashimoto thyroiditis. But in the latter scenario, the TSH-to-T₄ production relationship may be unstable over time, for as additional thyroid gland is destroyed, T₄ production will continue to decrease, the TSH will increase, and the thyroid gland may ultimately fail and hypothyroidism will occur. Hence the recommendation that in the setting of subclinical hypothyroidism and antiperoxidase antibodies, T₄ and TSH levels should be monitored regularly in order to detect early true thyroid gland failure when the T₄ level can no longer be maintained despite the increased stimulation of the gland by the elevated TSH. Analogous to this may be subclinical hypothyroidism in the elderly, in whom thyroid gland failure may develop, despite an increased TSH, from senescence rather than autoimmunity. What I am suggesting is that the natural history of all patients with subclinical hypothyroidism is not alike, and it thus should not be surprising that there does not seem to be a one-size-fits-all approach to management.

Symptoms in patients with subclinical hypothyroidism have not uniformly improved with T₄ treatment compared with placebo. Notably, most patients with subclinical hypothyroidism experience no symptoms. But consider the extremely common symptom of fatigue, which can be present for a myriad of defined and undefined reasons. This symptom may often lead physicians to check the TSH and, if that is even slightly elevated, to also check the T₄. It may also lead some physicians to routinely check the T₄. Subclinical hypothyroidism is also quite common; thus, by chance alone or because of the circadian timing of checking the TSH, a slightly elevated TSH and fatigue may coexist and yet be unrelated.

Additionally, a positive biochemical response to thyroxine supplementation, such as a lowering of cholesterol, does not prove that the patient was clinically hypothyroid prior to supplementation, any more than lowering a patient’s blood glucose with insulin proves that the patient was diabetic. The management of subclinical hypothyroidism should be nuanced and based on both clinical and laboratory parameters.

At a quick read, the messages from these articles may seem contradictory. But the biology is more complex in the setting of endogenous production of T₄ by the thyroid gland, which is regulated by TSH, which in turn is regulated in a feedback loop by the thyroid-produced T₄. In the setting of a fixed replacement dose of exogenous levothyroxine, the provided hormone affects the pituitary production of TSH, which likely will have no significant subsequent effect on the T₄ level. Thus, the feedback control loop is far simpler.

There has not been a definitive study demonstrating that thyroxine supplementation in patients with subclinical hypothyroidism results in a superior clinical outcome. There are hints that this may be the case, and Azim and Nasr cite some of these studies. Recognizing a few markedly different physiologic reasons why the TSH can be slightly elevated and the T₄ normal helps explain the lack of uniform clinical success with supplementation therapy and provides rationales for some management strategies.

Any biological variability in the responsiveness of the thyroid gland to TSH may affect the relationship between the levels of TSH and thyroid gland-released T₄. In theory, if the thyroid receptor has decreased affinity for TSH, a higher TSH concentration will be needed to get the thyroid gland to secrete the level of T₄ that the pituitary sensing mechanism deems normal for that individual. If the receptor affinity was decreased due to a gene polymorphism, this relationship between TSH and T₄ may be stable, and providing exogenous T₄ will result in a lower, “normalized” TSH level but may disrupt the thyroid-pituitary crosstalk and may even produce clinical hyperthyroidism.

A similar scenario exists in the setting of early thyroid gland failure, such as in Hashimoto thyroiditis. But in the latter scenario, the TSH-to-T₄ production relationship may be unstable over time, for as additional thyroid gland is destroyed, T₄ production will continue to decrease, the TSH will increase, and the thyroid gland may ultimately fail and hypothyroidism will occur. Hence the recommendation that in the setting of subclinical hypothyroidism and antiperoxidase antibodies, T₄ and TSH levels should be monitored regularly in order to detect early true thyroid gland failure when the T₄ level can no longer be maintained despite the increased stimulation of the gland by the elevated TSH. Analogous to this may be subclinical hypothyroidism in the elderly, in whom thyroid gland failure may develop, despite an increased TSH, from senescence rather than autoimmunity. What I am suggesting is that the natural history of all patients with subclinical hypothyroidism is not alike, and it thus should not be surprising that there does not seem to be a one-size-fits-all approach to management.

Symptoms in patients with subclinical hypothyroidism have not uniformly improved with T₄ treatment compared with placebo. Notably, most patients with subclinical hypothyroidism experience no symptoms. But consider the extremely common symptom of fatigue, which can be present for a myriad of defined and undefined reasons. This symptom may often lead physicians to check the TSH and, if that is even slightly elevated, to also check the T₄. It may also lead some physicians to routinely check the T₄. Subclinical hypothyroidism is also quite common; thus, by chance alone or because of the circadian timing of checking the TSH, a slightly elevated TSH and fatigue may coexist and yet be unrelated.

Additionally, a positive biochemical response to thyroxine supplementation, such as a lowering of cholesterol, does not prove that the patient was clinically hypothyroid prior to supplementation, any more than lowering a patient’s blood glucose with insulin proves that the patient was diabetic. The management of subclinical hypothyroidism should be nuanced and based on both clinical and laboratory parameters.

On examination, the numerous firm, indurated nodules ranged in size from 1 to 4 cm. There was no palpable lymphadenopathy.

Results of a peripheral blood cell count showed the following:

• Hemoglobin 12.5 g/dL (reference range 13.0–17.0)
• Platelet count 154 × 10⁹/L (130–400)
• White blood cell count 5.0 × 10⁹/L (4.0–11.0)
• Neutrophils 1.7 × 10⁹/L (1.5–8.0)
• Lymphocytes 2.2 × 10⁹/L (1.0–4.0)
• Monocytes 1.0 × 10⁹/L (0.2–1.0)
• Eosinophils 0 (0–0.4)
• Basophils 0 (0–0.2)
• Blasts 0.

The findings were consistent with leukemic cells with monocytic differentiation. The infiltrate was unusual because leukemic infiltrates typically demonstrate a high nuclear-to-cytoplasmic ratio, but in this case the malignant cells had moderate amounts of cytoplasm due to the monocytic differentiation. Also, a grenz zone is more typically seen in B-cell lymphomas, and T cells more typically demonstrate epidermotropism.

Bone marrow aspiration was performed and revealed a hypercellular bone marrow with trilineage maturation with only 2% blasts. The fluorescence in situ hybridization testing for myelodysplastic syndrome and acute myeloid leukemia was normal. A diagnosis of aleukemic leukemia cutis was made.

After 2 months of chemotherapy with azacitidine, the nodules were less indurated. Treatment was briefly withdrawn due to the development of acute pneumonia, leading to a rapid progression of cutaneous involvement. Despite restarting chemotherapy, the patient died.

The differential diagnosis of leukemia cutis is diverse and extensive. Patients often present with painless, firm, indurated nodules, papules, and plaques.¹ The lesions can be small, involving a small amount of body surface area, but can also be very large and diffuse.

In our patient’s case, there were no new drugs or exposures to suggest a drug-related eruption, or pruritus or pain to suggest an inflammatory process. The rapid progression of the lesions suggested either an infectious or malignant process. The top 3 conditions in the differential diagnosis, based on his clinical presentation, were cutaneous T-cell lymphoma, cutaneous CD30+ anaplastic large-cell lymphoma, and a drug-induced cutaneous pseudolymphoma.

Skin biopsy is required to differentiate leukemia cutis from the other conditions. On skin biopsy study, leukemia cutis is characterized by infiltration of the skin by leukemic cells and is seen in 10% to 15% of patients with acute myeloid leukemia.² In 5% of cases, leukemia cutis can present without bone marrow or peripheral signs of leukemia, hence the term aleukemic leukemia cutis.³ Cutaneous signs can occur before, after, or simultaneously with systemic leukemia.⁴

In the absence of systemic symptoms, the diagnosis is made when progressive cutaneous symptoms are present. The prognosis for aleukemic leukemia cutis is poor. Prompt diagnosis with skin biopsy is paramount to improve outcomes.

Acknowledgment: We would like to recognize Maanasa Devabhaktuni for her assistance in reporting this case.

On examination, the numerous firm, indurated nodules ranged in size from 1 to 4 cm. There was no palpable lymphadenopathy.

Results of a peripheral blood cell count showed the following:

• Hemoglobin 12.5 g/dL (reference range 13.0–17.0)
• Platelet count 154 × 10⁹/L (130–400)
• White blood cell count 5.0 × 10⁹/L (4.0–11.0)
• Neutrophils 1.7 × 10⁹/L (1.5–8.0)
• Lymphocytes 2.2 × 10⁹/L (1.0–4.0)
• Monocytes 1.0 × 10⁹/L (0.2–1.0)
• Eosinophils 0 (0–0.4)
• Basophils 0 (0–0.2)
• Blasts 0.

The findings were consistent with leukemic cells with monocytic differentiation. The infiltrate was unusual because leukemic infiltrates typically demonstrate a high nuclear-to-cytoplasmic ratio, but in this case the malignant cells had moderate amounts of cytoplasm due to the monocytic differentiation. Also, a grenz zone is more typically seen in B-cell lymphomas, and T cells more typically demonstrate epidermotropism.

Bone marrow aspiration was performed and revealed a hypercellular bone marrow with trilineage maturation with only 2% blasts. The fluorescence in situ hybridization testing for myelodysplastic syndrome and acute myeloid leukemia was normal. A diagnosis of aleukemic leukemia cutis was made.

After 2 months of chemotherapy with azacitidine, the nodules were less indurated. Treatment was briefly withdrawn due to the development of acute pneumonia, leading to a rapid progression of cutaneous involvement. Despite restarting chemotherapy, the patient died.

The differential diagnosis of leukemia cutis is diverse and extensive. Patients often present with painless, firm, indurated nodules, papules, and plaques.¹ The lesions can be small, involving a small amount of body surface area, but can also be very large and diffuse.

In our patient’s case, there were no new drugs or exposures to suggest a drug-related eruption, or pruritus or pain to suggest an inflammatory process. The rapid progression of the lesions suggested either an infectious or malignant process. The top 3 conditions in the differential diagnosis, based on his clinical presentation, were cutaneous T-cell lymphoma, cutaneous CD30+ anaplastic large-cell lymphoma, and a drug-induced cutaneous pseudolymphoma.

Skin biopsy is required to differentiate leukemia cutis from the other conditions. On skin biopsy study, leukemia cutis is characterized by infiltration of the skin by leukemic cells and is seen in 10% to 15% of patients with acute myeloid leukemia.² In 5% of cases, leukemia cutis can present without bone marrow or peripheral signs of leukemia, hence the term aleukemic leukemia cutis.³ Cutaneous signs can occur before, after, or simultaneously with systemic leukemia.⁴

In the absence of systemic symptoms, the diagnosis is made when progressive cutaneous symptoms are present. The prognosis for aleukemic leukemia cutis is poor. Prompt diagnosis with skin biopsy is paramount to improve outcomes.

Acknowledgment: We would like to recognize Maanasa Devabhaktuni for her assistance in reporting this case.

On examination, the numerous firm, indurated nodules ranged in size from 1 to 4 cm. There was no palpable lymphadenopathy.

Results of a peripheral blood cell count showed the following:

• Hemoglobin 12.5 g/dL (reference range 13.0–17.0)
• Platelet count 154 × 10⁹/L (130–400)
• White blood cell count 5.0 × 10⁹/L (4.0–11.0)
• Neutrophils 1.7 × 10⁹/L (1.5–8.0)
• Lymphocytes 2.2 × 10⁹/L (1.0–4.0)
• Monocytes 1.0 × 10⁹/L (0.2–1.0)
• Eosinophils 0 (0–0.4)
• Basophils 0 (0–0.2)
• Blasts 0.

The findings were consistent with leukemic cells with monocytic differentiation. The infiltrate was unusual because leukemic infiltrates typically demonstrate a high nuclear-to-cytoplasmic ratio, but in this case the malignant cells had moderate amounts of cytoplasm due to the monocytic differentiation. Also, a grenz zone is more typically seen in B-cell lymphomas, and T cells more typically demonstrate epidermotropism.

Bone marrow aspiration was performed and revealed a hypercellular bone marrow with trilineage maturation with only 2% blasts. The fluorescence in situ hybridization testing for myelodysplastic syndrome and acute myeloid leukemia was normal. A diagnosis of aleukemic leukemia cutis was made.

After 2 months of chemotherapy with azacitidine, the nodules were less indurated. Treatment was briefly withdrawn due to the development of acute pneumonia, leading to a rapid progression of cutaneous involvement. Despite restarting chemotherapy, the patient died.

The differential diagnosis of leukemia cutis is diverse and extensive. Patients often present with painless, firm, indurated nodules, papules, and plaques.¹ The lesions can be small, involving a small amount of body surface area, but can also be very large and diffuse.

In our patient’s case, there were no new drugs or exposures to suggest a drug-related eruption, or pruritus or pain to suggest an inflammatory process. The rapid progression of the lesions suggested either an infectious or malignant process. The top 3 conditions in the differential diagnosis, based on his clinical presentation, were cutaneous T-cell lymphoma, cutaneous CD30+ anaplastic large-cell lymphoma, and a drug-induced cutaneous pseudolymphoma.

Skin biopsy is required to differentiate leukemia cutis from the other conditions. On skin biopsy study, leukemia cutis is characterized by infiltration of the skin by leukemic cells and is seen in 10% to 15% of patients with acute myeloid leukemia.² In 5% of cases, leukemia cutis can present without bone marrow or peripheral signs of leukemia, hence the term aleukemic leukemia cutis.³ Cutaneous signs can occur before, after, or simultaneously with systemic leukemia.⁴

In the absence of systemic symptoms, the diagnosis is made when progressive cutaneous symptoms are present. The prognosis for aleukemic leukemia cutis is poor. Prompt diagnosis with skin biopsy is paramount to improve outcomes.

Acknowledgment: We would like to recognize Maanasa Devabhaktuni for her assistance in reporting this case.

Study Overview

Objective. To compare clinical outcomes (mortality, pain, physical restraint use, pressure ulcer, antipsychotic drug use) in long-term care nursing home (NH) residents with advanced dementia and hip fracture who underwent surgical repair or nonsurgical management.

Design. A retrospective cohort study utilizing nationwide Medicare (Parts A, B, D and hospice) claims data linked with Centers for Medicare & Medicaid Services Minimum Data Set (MDS version 2.0) assessments.

Setting and participants. Long-stay NH residents older than 65 years with advanced dementia (defined as being assigned to Cognitive Performance Scale category 5 or 6 and a diagnosis of dementia or Alzheimer disease) and without a do not hospitalize (DNH) directive before hip fracture were identified by using MDS assessments completed from January 1, 2008 to December 31, 2013. Medicare (Part A – inpatient, or Part B – outpatient) claims data was then used to identify those residents who experienced a hip fracture within 2 years of the full MDS assessment using the International Classification of Diseases, Ninth Revision diagnostic codes. Procedure codes were used to determine whether a resident who experienced hip fracture underwent surgical repair.

Main outcome measures. The main outcome measure was all-cause mortality after hip fracture ascertained by the Medicare Enrollment File through 2013. The secondary outcome measures were documented pain, physical restraint use, pressure ulcers, antipsychotic drug use, and ambulatory status in NH residents who survived 6 months after hip fracture. These outcome measures were captured from the first MDS assessment completed between 120 and 240 days following the fracture or Medicare Part D claims. Documented pain was determined using a validated MDS 2.0 nursing assessment pain instrument within 7 days preceding MDS assessment. Physical restraint use was defined by the use of trunk, limb, or chair restraint within 7 days prior to MDS assessment. Pressure ulcer was defined as any stage 2 to 4 pressure ulcer. Antipsychotic drug use of any medication subclass was determined using Medicare Part D claims data and affirmative if drug was administered 180 days after hip fracture. Ambulatory status between 120 and 240 days following the fracture was determined in a subset of NH residents who were ambulatory before the hip fracture. The utilization of comfort-focused care after hip fracture was determined in NH residents who had a Medicare hospice claim or a new DNH directive in the 180 days after hip fracture.

The differences in survival among NH residents with advanced dementia and hip fracture were described by Kaplan-Meier curves. The association between surgical repair and survival was determined using multivariable Cox proportional hazards for all NH residents and stratified by pre-fracture ambulatory status. In those who survived 6 months after hip fracture, the associations between surgical repair and outcomes including documented pain, physical restraint use, pressure ulcers, antipsychotic drug use, and ambulatory status were determined using multivariable logistic regression models. Adjustment for differences in characteristics before hip fracture was performed using inverse probability of treatment weighting (IPTW) models.

Main results. 3083 long-stay NH residents with advanced dementia and hip fracture were included in the study. The cohort’s mean age was 84.2 ± 7.1 years, 79.2% were female (n = 2441), and 28.5% were ambulatory before hip fracture (n = 879). Of these NH residents, 84.8% (n = 2615) underwent surgical repair and 15.2% (n = 468) received nonsurgical management. At 6 months after hip fracture, mortality was 31.5% in the surgical group compared to 53.8% in the nonsurgical group. The greatest mortality difference between groups occurred in the first 30 days after hip fracture (11.5% in surgical group versus 30.6% in nonsurgical group). Surgical repair was associated with a decreased risk of death (Cox proportional hazard ratio) in the unadjusted (hazard ratio [HR], 0.55 [95% confidence interval {CI}, 0.49-0.61), multivariable adjusted (adjusted HR, 0.56 [95% CI, 0.49-0.63]), and IPTW (adjusted HR, 0.88 [95% CI, 0.79-0.98]) models. Similarly, surgically treated NH residents were less likely to die than those managed non-surgically when mortality was stratified by pre-fracture ambulatory status.

Among NH residents who survived 6 months after hip fracture, those who underwent surgical repair compared with those who received nonsurgical management had less documented pain (29.0% versus 30.9%), fewer pressure ulcers (11.2% versus 19.0%), greater physical restraint use (13.0% versus 11.1%), and greater antipsychotic drug use (29.5% versus 20.4%). In the adjusted IPTW models, surgical repair was associated with less pain (adjusted HR, 0.78 [95% CI, 0.61-0.99]) and fewer pressure ulcers (adjusted HR, 0.64 [95% CI, 0.47-0.86]).

Overall, 21.5% of NH residents utilized comfort-focused care within 6 months after hip fracture, with a mean time to utilization of hospice care of 56 ± 49 days. In those who were managed surgically, 19.3% utilized hospice care, as compared with 33.8% in those who did not receive surgical intervention. In NH residents who survived 6 months after hip fracture, only 1.1% in both groups acquired a DNH directive.

Conclusion. In older long-stay NH residents with advanced dementia and hip fracture, surgical repair was associated with lower all-cause mortality, less documented pain, and fewer pressure ulcers compared to nonsurgical management. However, adverse clinical outcomes such as pain, physical restraint use, pressure ulcers, and antipsychotic drug use were common regardless of treatment modality. The high incidence of these adverse outcomes and hazardous interventions, coupled with low utilization of comfort-focused care and DNH directive, highlight an opportunity to improve the quality of care in this vulnerable population.

Commentary

Hip fracture is very common in NH residents, with an overall incident rate of 2.3 per 100 person years and is associated with a high mortality rate of 36.2% by 6 months after fracture.^1,2 Moreover, Neuman and colleagues have recently reported that among NH residents who have some degree of functional independence in locomotion prior to hip fracture, 54% either die or develop new total dependence in locomotion within 6 months of fracture and that severe cognitive impairment is a risk factor highly associated with these adverse outcomes.³ Despite this emerging knowledge, surgical repair of hip fracture remains the mainstay treatment in many NH residents in the hope of alleviating pain and improving mobility, and palliative care is considered only when patients are imminently dying or have deteriorated past the point of meaningful recovery. In cases of NH residents with advanced dementia whose life expectancy is limited and whose care goals may favor maintaining comfort, the health care proxies are frequently challenged with a difficult choice of either pursuing or foregoing surgical management—a complex medical decision to be made in the absence of sufficient evidence in this uniquely frail patient population.

The study reported by Berry and colleagues provides an important and timely investigation in examining associations of adverse clinical outcomes (mortality, pain, pressure ulcer) and hazardous interventions (physical restraint and antipsychotic drug use) in long-stay NH residents with advanced dementia and hip fracture who underwent surgical repair or nonsurgical management. The authors reported a 6-month mortality rate of 31.5% in NH residents who underwent surgical repair, an event rate similar to that reported by Neuman and colleagues. While surgical repair after hip fracture was associated with a decreased risk of death compared to nonsurgical management, high incidences of pain (29.0% to 30.9%) and pressure ulcers (11.2% to 19.0%), and frequent physical restraint use (11.1% to 13.0%) and antipsychotic drug use (20.4% to 29.5%) were noted in NH residents who survived 6 months after fracture regardless of treatment modality. These findings are consistent with the high rate of post-hip fracture functional disability previously reported by Neuman and colleagues, and highlight the trajectory of decline, frequent distressing symptoms, and prevalent use of pharmacologic and nonpharmacologic restraints in long-stay NH residents after hip fracture. Taken together, the low utilization of comfort-focused care (21.5%) and DNH directive (1.1%) in NH residents who survived 6 months suggest a missed opportunity to integrate palliative care in a patient population that stands to benefit from this intervention.

This study is the first to report the associations between hip fracture surgery and a reduction in adverse outcomes such as pain and pressure ulcer that commonly affect vulnerable NH residents with advanced dementia. This study was well designed and leveraged strengths of Medicare claims data linked with MDS assessments to capture outcome measures including pain, pressure ulcer, and restraint use that would otherwise be difficult to ascertain. However, as in all retrospective cohort design, there were limitations in this study. For instance, secondary outcomes were determined from a single time point (ie, first MDS assessment completed between 120 to 240 days following hip fracture) and thus data capture may be incomplete. Additionally, other conditions important to complex decision making in the care of frail older adults including postoperative complications (eg, delirium, infections, cardiac complications) and in-hospital mortality were not examined. Despite these limitations, this study has enhanced our understanding of the clinical course of long-term care NH residents with advanced dementia who endured hip fracture.

Applications for Clinical Practice

Patients’ goals of care should guide medical decision making in the management of hip fracture in NH residents with advanced dementia. The increased survival benefit of surgical repair of hip fracture in this patient population should be considered in the medical decision-making process if life-prolongation is preferred. However, palliative and hospice care need to be an important facet of discussion given the high rates of mortality, pain, pressure ulcer, and restraint use in this vulnerable subset of older adults.

—Fred Ko, MD, MS

Study Overview

Objective. To compare clinical outcomes (mortality, pain, physical restraint use, pressure ulcer, antipsychotic drug use) in long-term care nursing home (NH) residents with advanced dementia and hip fracture who underwent surgical repair or nonsurgical management.

Design. A retrospective cohort study utilizing nationwide Medicare (Parts A, B, D and hospice) claims data linked with Centers for Medicare & Medicaid Services Minimum Data Set (MDS version 2.0) assessments.

Setting and participants. Long-stay NH residents older than 65 years with advanced dementia (defined as being assigned to Cognitive Performance Scale category 5 or 6 and a diagnosis of dementia or Alzheimer disease) and without a do not hospitalize (DNH) directive before hip fracture were identified by using MDS assessments completed from January 1, 2008 to December 31, 2013. Medicare (Part A – inpatient, or Part B – outpatient) claims data was then used to identify those residents who experienced a hip fracture within 2 years of the full MDS assessment using the International Classification of Diseases, Ninth Revision diagnostic codes. Procedure codes were used to determine whether a resident who experienced hip fracture underwent surgical repair.

Main outcome measures. The main outcome measure was all-cause mortality after hip fracture ascertained by the Medicare Enrollment File through 2013. The secondary outcome measures were documented pain, physical restraint use, pressure ulcers, antipsychotic drug use, and ambulatory status in NH residents who survived 6 months after hip fracture. These outcome measures were captured from the first MDS assessment completed between 120 and 240 days following the fracture or Medicare Part D claims. Documented pain was determined using a validated MDS 2.0 nursing assessment pain instrument within 7 days preceding MDS assessment. Physical restraint use was defined by the use of trunk, limb, or chair restraint within 7 days prior to MDS assessment. Pressure ulcer was defined as any stage 2 to 4 pressure ulcer. Antipsychotic drug use of any medication subclass was determined using Medicare Part D claims data and affirmative if drug was administered 180 days after hip fracture. Ambulatory status between 120 and 240 days following the fracture was determined in a subset of NH residents who were ambulatory before the hip fracture. The utilization of comfort-focused care after hip fracture was determined in NH residents who had a Medicare hospice claim or a new DNH directive in the 180 days after hip fracture.

The differences in survival among NH residents with advanced dementia and hip fracture were described by Kaplan-Meier curves. The association between surgical repair and survival was determined using multivariable Cox proportional hazards for all NH residents and stratified by pre-fracture ambulatory status. In those who survived 6 months after hip fracture, the associations between surgical repair and outcomes including documented pain, physical restraint use, pressure ulcers, antipsychotic drug use, and ambulatory status were determined using multivariable logistic regression models. Adjustment for differences in characteristics before hip fracture was performed using inverse probability of treatment weighting (IPTW) models.

Main results. 3083 long-stay NH residents with advanced dementia and hip fracture were included in the study. The cohort’s mean age was 84.2 ± 7.1 years, 79.2% were female (n = 2441), and 28.5% were ambulatory before hip fracture (n = 879). Of these NH residents, 84.8% (n = 2615) underwent surgical repair and 15.2% (n = 468) received nonsurgical management. At 6 months after hip fracture, mortality was 31.5% in the surgical group compared to 53.8% in the nonsurgical group. The greatest mortality difference between groups occurred in the first 30 days after hip fracture (11.5% in surgical group versus 30.6% in nonsurgical group). Surgical repair was associated with a decreased risk of death (Cox proportional hazard ratio) in the unadjusted (hazard ratio [HR], 0.55 [95% confidence interval {CI}, 0.49-0.61), multivariable adjusted (adjusted HR, 0.56 [95% CI, 0.49-0.63]), and IPTW (adjusted HR, 0.88 [95% CI, 0.79-0.98]) models. Similarly, surgically treated NH residents were less likely to die than those managed non-surgically when mortality was stratified by pre-fracture ambulatory status.

Among NH residents who survived 6 months after hip fracture, those who underwent surgical repair compared with those who received nonsurgical management had less documented pain (29.0% versus 30.9%), fewer pressure ulcers (11.2% versus 19.0%), greater physical restraint use (13.0% versus 11.1%), and greater antipsychotic drug use (29.5% versus 20.4%). In the adjusted IPTW models, surgical repair was associated with less pain (adjusted HR, 0.78 [95% CI, 0.61-0.99]) and fewer pressure ulcers (adjusted HR, 0.64 [95% CI, 0.47-0.86]).

Overall, 21.5% of NH residents utilized comfort-focused care within 6 months after hip fracture, with a mean time to utilization of hospice care of 56 ± 49 days. In those who were managed surgically, 19.3% utilized hospice care, as compared with 33.8% in those who did not receive surgical intervention. In NH residents who survived 6 months after hip fracture, only 1.1% in both groups acquired a DNH directive.

Conclusion. In older long-stay NH residents with advanced dementia and hip fracture, surgical repair was associated with lower all-cause mortality, less documented pain, and fewer pressure ulcers compared to nonsurgical management. However, adverse clinical outcomes such as pain, physical restraint use, pressure ulcers, and antipsychotic drug use were common regardless of treatment modality. The high incidence of these adverse outcomes and hazardous interventions, coupled with low utilization of comfort-focused care and DNH directive, highlight an opportunity to improve the quality of care in this vulnerable population.

Commentary

Hip fracture is very common in NH residents, with an overall incident rate of 2.3 per 100 person years and is associated with a high mortality rate of 36.2% by 6 months after fracture.^1,2 Moreover, Neuman and colleagues have recently reported that among NH residents who have some degree of functional independence in locomotion prior to hip fracture, 54% either die or develop new total dependence in locomotion within 6 months of fracture and that severe cognitive impairment is a risk factor highly associated with these adverse outcomes.³ Despite this emerging knowledge, surgical repair of hip fracture remains the mainstay treatment in many NH residents in the hope of alleviating pain and improving mobility, and palliative care is considered only when patients are imminently dying or have deteriorated past the point of meaningful recovery. In cases of NH residents with advanced dementia whose life expectancy is limited and whose care goals may favor maintaining comfort, the health care proxies are frequently challenged with a difficult choice of either pursuing or foregoing surgical management—a complex medical decision to be made in the absence of sufficient evidence in this uniquely frail patient population.

The study reported by Berry and colleagues provides an important and timely investigation in examining associations of adverse clinical outcomes (mortality, pain, pressure ulcer) and hazardous interventions (physical restraint and antipsychotic drug use) in long-stay NH residents with advanced dementia and hip fracture who underwent surgical repair or nonsurgical management. The authors reported a 6-month mortality rate of 31.5% in NH residents who underwent surgical repair, an event rate similar to that reported by Neuman and colleagues. While surgical repair after hip fracture was associated with a decreased risk of death compared to nonsurgical management, high incidences of pain (29.0% to 30.9%) and pressure ulcers (11.2% to 19.0%), and frequent physical restraint use (11.1% to 13.0%) and antipsychotic drug use (20.4% to 29.5%) were noted in NH residents who survived 6 months after fracture regardless of treatment modality. These findings are consistent with the high rate of post-hip fracture functional disability previously reported by Neuman and colleagues, and highlight the trajectory of decline, frequent distressing symptoms, and prevalent use of pharmacologic and nonpharmacologic restraints in long-stay NH residents after hip fracture. Taken together, the low utilization of comfort-focused care (21.5%) and DNH directive (1.1%) in NH residents who survived 6 months suggest a missed opportunity to integrate palliative care in a patient population that stands to benefit from this intervention.

This study is the first to report the associations between hip fracture surgery and a reduction in adverse outcomes such as pain and pressure ulcer that commonly affect vulnerable NH residents with advanced dementia. This study was well designed and leveraged strengths of Medicare claims data linked with MDS assessments to capture outcome measures including pain, pressure ulcer, and restraint use that would otherwise be difficult to ascertain. However, as in all retrospective cohort design, there were limitations in this study. For instance, secondary outcomes were determined from a single time point (ie, first MDS assessment completed between 120 to 240 days following hip fracture) and thus data capture may be incomplete. Additionally, other conditions important to complex decision making in the care of frail older adults including postoperative complications (eg, delirium, infections, cardiac complications) and in-hospital mortality were not examined. Despite these limitations, this study has enhanced our understanding of the clinical course of long-term care NH residents with advanced dementia who endured hip fracture.

Applications for Clinical Practice

Patients’ goals of care should guide medical decision making in the management of hip fracture in NH residents with advanced dementia. The increased survival benefit of surgical repair of hip fracture in this patient population should be considered in the medical decision-making process if life-prolongation is preferred. However, palliative and hospice care need to be an important facet of discussion given the high rates of mortality, pain, pressure ulcer, and restraint use in this vulnerable subset of older adults.

—Fred Ko, MD, MS

Study Overview

Objective. To compare clinical outcomes (mortality, pain, physical restraint use, pressure ulcer, antipsychotic drug use) in long-term care nursing home (NH) residents with advanced dementia and hip fracture who underwent surgical repair or nonsurgical management.

Design. A retrospective cohort study utilizing nationwide Medicare (Parts A, B, D and hospice) claims data linked with Centers for Medicare & Medicaid Services Minimum Data Set (MDS version 2.0) assessments.

Setting and participants. Long-stay NH residents older than 65 years with advanced dementia (defined as being assigned to Cognitive Performance Scale category 5 or 6 and a diagnosis of dementia or Alzheimer disease) and without a do not hospitalize (DNH) directive before hip fracture were identified by using MDS assessments completed from January 1, 2008 to December 31, 2013. Medicare (Part A – inpatient, or Part B – outpatient) claims data was then used to identify those residents who experienced a hip fracture within 2 years of the full MDS assessment using the International Classification of Diseases, Ninth Revision diagnostic codes. Procedure codes were used to determine whether a resident who experienced hip fracture underwent surgical repair.

Main outcome measures. The main outcome measure was all-cause mortality after hip fracture ascertained by the Medicare Enrollment File through 2013. The secondary outcome measures were documented pain, physical restraint use, pressure ulcers, antipsychotic drug use, and ambulatory status in NH residents who survived 6 months after hip fracture. These outcome measures were captured from the first MDS assessment completed between 120 and 240 days following the fracture or Medicare Part D claims. Documented pain was determined using a validated MDS 2.0 nursing assessment pain instrument within 7 days preceding MDS assessment. Physical restraint use was defined by the use of trunk, limb, or chair restraint within 7 days prior to MDS assessment. Pressure ulcer was defined as any stage 2 to 4 pressure ulcer. Antipsychotic drug use of any medication subclass was determined using Medicare Part D claims data and affirmative if drug was administered 180 days after hip fracture. Ambulatory status between 120 and 240 days following the fracture was determined in a subset of NH residents who were ambulatory before the hip fracture. The utilization of comfort-focused care after hip fracture was determined in NH residents who had a Medicare hospice claim or a new DNH directive in the 180 days after hip fracture.

The differences in survival among NH residents with advanced dementia and hip fracture were described by Kaplan-Meier curves. The association between surgical repair and survival was determined using multivariable Cox proportional hazards for all NH residents and stratified by pre-fracture ambulatory status. In those who survived 6 months after hip fracture, the associations between surgical repair and outcomes including documented pain, physical restraint use, pressure ulcers, antipsychotic drug use, and ambulatory status were determined using multivariable logistic regression models. Adjustment for differences in characteristics before hip fracture was performed using inverse probability of treatment weighting (IPTW) models.

Main results. 3083 long-stay NH residents with advanced dementia and hip fracture were included in the study. The cohort’s mean age was 84.2 ± 7.1 years, 79.2% were female (n = 2441), and 28.5% were ambulatory before hip fracture (n = 879). Of these NH residents, 84.8% (n = 2615) underwent surgical repair and 15.2% (n = 468) received nonsurgical management. At 6 months after hip fracture, mortality was 31.5% in the surgical group compared to 53.8% in the nonsurgical group. The greatest mortality difference between groups occurred in the first 30 days after hip fracture (11.5% in surgical group versus 30.6% in nonsurgical group). Surgical repair was associated with a decreased risk of death (Cox proportional hazard ratio) in the unadjusted (hazard ratio [HR], 0.55 [95% confidence interval {CI}, 0.49-0.61), multivariable adjusted (adjusted HR, 0.56 [95% CI, 0.49-0.63]), and IPTW (adjusted HR, 0.88 [95% CI, 0.79-0.98]) models. Similarly, surgically treated NH residents were less likely to die than those managed non-surgically when mortality was stratified by pre-fracture ambulatory status.

Among NH residents who survived 6 months after hip fracture, those who underwent surgical repair compared with those who received nonsurgical management had less documented pain (29.0% versus 30.9%), fewer pressure ulcers (11.2% versus 19.0%), greater physical restraint use (13.0% versus 11.1%), and greater antipsychotic drug use (29.5% versus 20.4%). In the adjusted IPTW models, surgical repair was associated with less pain (adjusted HR, 0.78 [95% CI, 0.61-0.99]) and fewer pressure ulcers (adjusted HR, 0.64 [95% CI, 0.47-0.86]).

Overall, 21.5% of NH residents utilized comfort-focused care within 6 months after hip fracture, with a mean time to utilization of hospice care of 56 ± 49 days. In those who were managed surgically, 19.3% utilized hospice care, as compared with 33.8% in those who did not receive surgical intervention. In NH residents who survived 6 months after hip fracture, only 1.1% in both groups acquired a DNH directive.

Conclusion. In older long-stay NH residents with advanced dementia and hip fracture, surgical repair was associated with lower all-cause mortality, less documented pain, and fewer pressure ulcers compared to nonsurgical management. However, adverse clinical outcomes such as pain, physical restraint use, pressure ulcers, and antipsychotic drug use were common regardless of treatment modality. The high incidence of these adverse outcomes and hazardous interventions, coupled with low utilization of comfort-focused care and DNH directive, highlight an opportunity to improve the quality of care in this vulnerable population.

Commentary

Hip fracture is very common in NH residents, with an overall incident rate of 2.3 per 100 person years and is associated with a high mortality rate of 36.2% by 6 months after fracture.^1,2 Moreover, Neuman and colleagues have recently reported that among NH residents who have some degree of functional independence in locomotion prior to hip fracture, 54% either die or develop new total dependence in locomotion within 6 months of fracture and that severe cognitive impairment is a risk factor highly associated with these adverse outcomes.³ Despite this emerging knowledge, surgical repair of hip fracture remains the mainstay treatment in many NH residents in the hope of alleviating pain and improving mobility, and palliative care is considered only when patients are imminently dying or have deteriorated past the point of meaningful recovery. In cases of NH residents with advanced dementia whose life expectancy is limited and whose care goals may favor maintaining comfort, the health care proxies are frequently challenged with a difficult choice of either pursuing or foregoing surgical management—a complex medical decision to be made in the absence of sufficient evidence in this uniquely frail patient population.

The study reported by Berry and colleagues provides an important and timely investigation in examining associations of adverse clinical outcomes (mortality, pain, pressure ulcer) and hazardous interventions (physical restraint and antipsychotic drug use) in long-stay NH residents with advanced dementia and hip fracture who underwent surgical repair or nonsurgical management. The authors reported a 6-month mortality rate of 31.5% in NH residents who underwent surgical repair, an event rate similar to that reported by Neuman and colleagues. While surgical repair after hip fracture was associated with a decreased risk of death compared to nonsurgical management, high incidences of pain (29.0% to 30.9%) and pressure ulcers (11.2% to 19.0%), and frequent physical restraint use (11.1% to 13.0%) and antipsychotic drug use (20.4% to 29.5%) were noted in NH residents who survived 6 months after fracture regardless of treatment modality. These findings are consistent with the high rate of post-hip fracture functional disability previously reported by Neuman and colleagues, and highlight the trajectory of decline, frequent distressing symptoms, and prevalent use of pharmacologic and nonpharmacologic restraints in long-stay NH residents after hip fracture. Taken together, the low utilization of comfort-focused care (21.5%) and DNH directive (1.1%) in NH residents who survived 6 months suggest a missed opportunity to integrate palliative care in a patient population that stands to benefit from this intervention.

This study is the first to report the associations between hip fracture surgery and a reduction in adverse outcomes such as pain and pressure ulcer that commonly affect vulnerable NH residents with advanced dementia. This study was well designed and leveraged strengths of Medicare claims data linked with MDS assessments to capture outcome measures including pain, pressure ulcer, and restraint use that would otherwise be difficult to ascertain. However, as in all retrospective cohort design, there were limitations in this study. For instance, secondary outcomes were determined from a single time point (ie, first MDS assessment completed between 120 to 240 days following hip fracture) and thus data capture may be incomplete. Additionally, other conditions important to complex decision making in the care of frail older adults including postoperative complications (eg, delirium, infections, cardiac complications) and in-hospital mortality were not examined. Despite these limitations, this study has enhanced our understanding of the clinical course of long-term care NH residents with advanced dementia who endured hip fracture.

Applications for Clinical Practice

Patients’ goals of care should guide medical decision making in the management of hip fracture in NH residents with advanced dementia. The increased survival benefit of surgical repair of hip fracture in this patient population should be considered in the medical decision-making process if life-prolongation is preferred. However, palliative and hospice care need to be an important facet of discussion given the high rates of mortality, pain, pressure ulcer, and restraint use in this vulnerable subset of older adults.

—Fred Ko, MD, MS

After a disappointing interim analysis, Roche and its collaborator AC Immune are halting two phase 3 trials of the antiamyloid antibody crenezumab.

CREAD 1 and CREAD 2 enrolled patients with prodromal-to-mild sporadic Alzheimer’s disease. The preplanned interim safety and efficacy analysis determined that neither study was likely to meet the primary endpoint of change from baseline on the Clinical Dementia Rating-sum of boxes score.

There were no unexpected safety signals associated with the drug, despite a quadrupling of the phase 3 dose from that used in phase 2. The company in its press release said that it will continue to conduct the Autosomal Dominant Alzheimer’s Disease (ADAD) trial as part of the Alzheimer’s Prevention Initiative (API). ADAD is a large South American trial of crenezumab in Colombian families with familial Alzheimer’s caused by mutations in the presenilin-1 gene (PSEN1).

Roche did not release any data but said the trial results will be discussed at an upcoming scientific meeting.

“While the results with crenezumab are disappointing, they meaningfully contribute to our understanding of Alzheimer’s disease,” Sandra Horning, MD, Roche’s chief medical officer and executive vice president for global development, said in an interview. “We gratefully acknowledge the participants in the CREAD trials and the efforts of everyone involved in this important program.”

The decision was not a surprise to researchers who have followed the antibody’s development. It advanced into phase 3 with lackluster phase 2 cognitive, imaging, and biomarker data. Its selection as the therapeutic agent for the ADAD trial was a key driver in its continued development, securing Roche $100 million in federal funds to help launch ADAD, the first-ever Alzheimer’s primary prevention study.

Despite its failure in sporadic Alzheimer’s, there is still some hope that crenezumab might benefit people with the PSEN1 mutation, said Richard Caselli, MD, professor of neurology at the Mayo Clinic Arizona in Scottsdale and associate director and clinical core director of the Arizona Alzheimer’s Disease Center.

“The Colombian trial is aimed at dominantly-inherited AD due to a PSEN1 mutation, so it is different enough to imagine it still might make a difference in patients in whom amyloid metabolism is actually defective due to functionally altered amyloid precursor protein or gamma secretase,” he said in an interview. “Possibly some might argue that many of the patients in the crenezumab trial likely had additional pathologies so that even if the AD component responded, the overall clinical picture might not reflect it due to the other components. That would be interesting if proven and could even argue against equating young-onset with late-onset AD, at least for clinical purposes, as is currently envisioned.”

Michael Wolfe, PhD, had a different take on the matter.

“Although amyloid-beta [Abeta] production is not necessarily altered in sporadic AD, there is essentially the same pathology, presentation, and progression with familial and sporadic AD, suggesting a common molecular mechanism,” said Dr. Wolfe, who is the Mathias P. Mertes Professor of Medicinal Chemistry at the University of Kansas, Lawrence. “It’s hard to say Abeta is the pathogenic species in familial but not sporadic AD.

The antibodies that have been failing for 5 years now were designed in the early 2000s, Dr. Kupiec pointed out, when knowledge of the various amyloid species was still immature. Newer candidates can target specific conformations of the protein – monomers and oligomers – before they aggregate into insoluble sheets. “Solanezumab was the first of these, paving the way for this new generation of antibodies,” Dr. Kupiec said.

Because they target soluble Abeta, not amyloid plaques, these domain-specific antibodies are less likely to elicit ARIA (amyloid-related imaging abnormalities), the inflammatory reaction that’s been associated with plaque dissolution in other antibody trials. ARIA has been a dose-limiting step for antiamyloid antibodies – one that conformationally targeted antibodies could avoid, Dr. Kupiec said.

“There may be some limited success with the these, and there may be enough of a treatment effect to secure approval,” he said. “The question is: Can we generate a higher effect size with an antibody that is more selective to the toxic forms of Abeta?”

PMN310 is ProMIS’ attempt to thread this needle. In preclinical studies, the antibody did not bind to amyloid monomers, plaques, or vascular Abeta aggregates. The company expects to take this antibody into phase 1 trials later this year.

“If we have a molecule that doesn’t bind to monomers or to plaques, but only to the toxic oligomer, then that is an something well worth testing in the clinic,” he said.

Dr. Caselli and Dr. Wolfe have no financial disclosures.

msullivan@mdedge.com

After a disappointing interim analysis, Roche and its collaborator AC Immune are halting two phase 3 trials of the antiamyloid antibody crenezumab.

CREAD 1 and CREAD 2 enrolled patients with prodromal-to-mild sporadic Alzheimer’s disease. The preplanned interim safety and efficacy analysis determined that neither study was likely to meet the primary endpoint of change from baseline on the Clinical Dementia Rating-sum of boxes score.

There were no unexpected safety signals associated with the drug, despite a quadrupling of the phase 3 dose from that used in phase 2. The company in its press release said that it will continue to conduct the Autosomal Dominant Alzheimer’s Disease (ADAD) trial as part of the Alzheimer’s Prevention Initiative (API). ADAD is a large South American trial of crenezumab in Colombian families with familial Alzheimer’s caused by mutations in the presenilin-1 gene (PSEN1).

Roche did not release any data but said the trial results will be discussed at an upcoming scientific meeting.

“While the results with crenezumab are disappointing, they meaningfully contribute to our understanding of Alzheimer’s disease,” Sandra Horning, MD, Roche’s chief medical officer and executive vice president for global development, said in an interview. “We gratefully acknowledge the participants in the CREAD trials and the efforts of everyone involved in this important program.”

The decision was not a surprise to researchers who have followed the antibody’s development. It advanced into phase 3 with lackluster phase 2 cognitive, imaging, and biomarker data. Its selection as the therapeutic agent for the ADAD trial was a key driver in its continued development, securing Roche $100 million in federal funds to help launch ADAD, the first-ever Alzheimer’s primary prevention study.

Despite its failure in sporadic Alzheimer’s, there is still some hope that crenezumab might benefit people with the PSEN1 mutation, said Richard Caselli, MD, professor of neurology at the Mayo Clinic Arizona in Scottsdale and associate director and clinical core director of the Arizona Alzheimer’s Disease Center.

“The Colombian trial is aimed at dominantly-inherited AD due to a PSEN1 mutation, so it is different enough to imagine it still might make a difference in patients in whom amyloid metabolism is actually defective due to functionally altered amyloid precursor protein or gamma secretase,” he said in an interview. “Possibly some might argue that many of the patients in the crenezumab trial likely had additional pathologies so that even if the AD component responded, the overall clinical picture might not reflect it due to the other components. That would be interesting if proven and could even argue against equating young-onset with late-onset AD, at least for clinical purposes, as is currently envisioned.”

Michael Wolfe, PhD, had a different take on the matter.

“Although amyloid-beta [Abeta] production is not necessarily altered in sporadic AD, there is essentially the same pathology, presentation, and progression with familial and sporadic AD, suggesting a common molecular mechanism,” said Dr. Wolfe, who is the Mathias P. Mertes Professor of Medicinal Chemistry at the University of Kansas, Lawrence. “It’s hard to say Abeta is the pathogenic species in familial but not sporadic AD.

The antibodies that have been failing for 5 years now were designed in the early 2000s, Dr. Kupiec pointed out, when knowledge of the various amyloid species was still immature. Newer candidates can target specific conformations of the protein – monomers and oligomers – before they aggregate into insoluble sheets. “Solanezumab was the first of these, paving the way for this new generation of antibodies,” Dr. Kupiec said.

Because they target soluble Abeta, not amyloid plaques, these domain-specific antibodies are less likely to elicit ARIA (amyloid-related imaging abnormalities), the inflammatory reaction that’s been associated with plaque dissolution in other antibody trials. ARIA has been a dose-limiting step for antiamyloid antibodies – one that conformationally targeted antibodies could avoid, Dr. Kupiec said.

“There may be some limited success with the these, and there may be enough of a treatment effect to secure approval,” he said. “The question is: Can we generate a higher effect size with an antibody that is more selective to the toxic forms of Abeta?”

PMN310 is ProMIS’ attempt to thread this needle. In preclinical studies, the antibody did not bind to amyloid monomers, plaques, or vascular Abeta aggregates. The company expects to take this antibody into phase 1 trials later this year.

“If we have a molecule that doesn’t bind to monomers or to plaques, but only to the toxic oligomer, then that is an something well worth testing in the clinic,” he said.

Dr. Caselli and Dr. Wolfe have no financial disclosures.

msullivan@mdedge.com

After a disappointing interim analysis, Roche and its collaborator AC Immune are halting two phase 3 trials of the antiamyloid antibody crenezumab.

CREAD 1 and CREAD 2 enrolled patients with prodromal-to-mild sporadic Alzheimer’s disease. The preplanned interim safety and efficacy analysis determined that neither study was likely to meet the primary endpoint of change from baseline on the Clinical Dementia Rating-sum of boxes score.

There were no unexpected safety signals associated with the drug, despite a quadrupling of the phase 3 dose from that used in phase 2. The company in its press release said that it will continue to conduct the Autosomal Dominant Alzheimer’s Disease (ADAD) trial as part of the Alzheimer’s Prevention Initiative (API). ADAD is a large South American trial of crenezumab in Colombian families with familial Alzheimer’s caused by mutations in the presenilin-1 gene (PSEN1).

Roche did not release any data but said the trial results will be discussed at an upcoming scientific meeting.

“While the results with crenezumab are disappointing, they meaningfully contribute to our understanding of Alzheimer’s disease,” Sandra Horning, MD, Roche’s chief medical officer and executive vice president for global development, said in an interview. “We gratefully acknowledge the participants in the CREAD trials and the efforts of everyone involved in this important program.”

The decision was not a surprise to researchers who have followed the antibody’s development. It advanced into phase 3 with lackluster phase 2 cognitive, imaging, and biomarker data. Its selection as the therapeutic agent for the ADAD trial was a key driver in its continued development, securing Roche $100 million in federal funds to help launch ADAD, the first-ever Alzheimer’s primary prevention study.

Despite its failure in sporadic Alzheimer’s, there is still some hope that crenezumab might benefit people with the PSEN1 mutation, said Richard Caselli, MD, professor of neurology at the Mayo Clinic Arizona in Scottsdale and associate director and clinical core director of the Arizona Alzheimer’s Disease Center.

“The Colombian trial is aimed at dominantly-inherited AD due to a PSEN1 mutation, so it is different enough to imagine it still might make a difference in patients in whom amyloid metabolism is actually defective due to functionally altered amyloid precursor protein or gamma secretase,” he said in an interview. “Possibly some might argue that many of the patients in the crenezumab trial likely had additional pathologies so that even if the AD component responded, the overall clinical picture might not reflect it due to the other components. That would be interesting if proven and could even argue against equating young-onset with late-onset AD, at least for clinical purposes, as is currently envisioned.”

Michael Wolfe, PhD, had a different take on the matter.

“Although amyloid-beta [Abeta] production is not necessarily altered in sporadic AD, there is essentially the same pathology, presentation, and progression with familial and sporadic AD, suggesting a common molecular mechanism,” said Dr. Wolfe, who is the Mathias P. Mertes Professor of Medicinal Chemistry at the University of Kansas, Lawrence. “It’s hard to say Abeta is the pathogenic species in familial but not sporadic AD.

The antibodies that have been failing for 5 years now were designed in the early 2000s, Dr. Kupiec pointed out, when knowledge of the various amyloid species was still immature. Newer candidates can target specific conformations of the protein – monomers and oligomers – before they aggregate into insoluble sheets. “Solanezumab was the first of these, paving the way for this new generation of antibodies,” Dr. Kupiec said.

Because they target soluble Abeta, not amyloid plaques, these domain-specific antibodies are less likely to elicit ARIA (amyloid-related imaging abnormalities), the inflammatory reaction that’s been associated with plaque dissolution in other antibody trials. ARIA has been a dose-limiting step for antiamyloid antibodies – one that conformationally targeted antibodies could avoid, Dr. Kupiec said.

“There may be some limited success with the these, and there may be enough of a treatment effect to secure approval,” he said. “The question is: Can we generate a higher effect size with an antibody that is more selective to the toxic forms of Abeta?”

PMN310 is ProMIS’ attempt to thread this needle. In preclinical studies, the antibody did not bind to amyloid monomers, plaques, or vascular Abeta aggregates. The company expects to take this antibody into phase 1 trials later this year.

“If we have a molecule that doesn’t bind to monomers or to plaques, but only to the toxic oligomer, then that is an something well worth testing in the clinic,” he said.

Dr. Caselli and Dr. Wolfe have no financial disclosures.

msullivan@mdedge.com

A new iteration of the SPRINT MIND hypertension trial will seek to prove conclusively the original study’s tantalizing suggestion: that intensive blood pressure control decreases the risk of developing mild cognitive impairment (MCI) and, eventually, dementia.

SPRINT MIND 2.0 will re-recruit SPRINT MIND subjects and enable another follow-up cognitive assessment and other clinical tests as they remain on their standard of care blood pressure regimen. It is largely funded by an $800,000 grant from the Alzheimer’s Association.

Initially released last July at the Alzheimer’s Association International Conference, the results of the SPRINT MIND have now appeared online in JAMA. Although it failed to meet its primary endpoint of reducing dementia incidence, the study did score on two secondary endpoints. Patients who reduced their systolic blood pressure to less than 120 mm Hg were 19% less likely to develop MCI and 17% less likely to be diagnosed with all-cause dementia than were those who achieved a hypertension target of less than 140 mm Hg.

The secondary results, and positive movement in the primary results, sparked excitement in the dementia research community last summer. They have suggested that the median 5-year follow-up just wasn’t long enough to show any significant effects on dementia, which can take years to fully manifest. Adding 2 more years with SPRINT MIND 2.0 should be long enough to discern those benefits, if indeed they exist.

“SPRINT MIND 2.0 and the work leading up to it offers genuine, concrete hope,” Maria C. Carrillo, PhD, chief science officer for the Alzheimer’s Association, said in a press statement. “MCI is a known risk factor for dementia, and everyone who experiences dementia passes through MCI. When you prevent new cases of MCI, you are preventing new cases of dementia. The Alzheimer’s Association finds these data to be compelling and is committed to getting clarity and certainty on the dementia outcome by following participants for a longer period of time.”

The study strengthens the new and energetic push to find ways to prevent dementia, which has proven itself intractable in every drug study to date.

“This study is in line with where the field of dementia research is going: preventing memory loss earlier,” said Laurie Ryan, PhD, chief of the dementias of aging branch in the National Institute on Aging. “Much like we have research-based interventions for heart health and cancer prevention, we hope to have guidance based on this and subsequent studies that will more definitively show how to slow or even stop dementia well before symptoms appear.”

NIA director Richard J. Hodes, MD, agreed.

“Dementia continues to be a large public health challenge, and based on the primary results of this study, we still have yet to find an intervention strategy proven to reduce the risk of dementia,” he said in a press statement. “Nevertheless, the secondary results showing that intensive lowering of blood pressure may reduce risk for MCI, a known risk factor for dementia, gives us additional avenues to explore on the path to prevention.”

SPRINT MIND was a substudy of the Systolic Blood Pressure Intervention Trial (SPRINT). It compared two strategies for managing hypertension in older adults. The intensive strategy had a target of less than 120 mm Hg, while standard care had a target of less than 140 mm Hg. SPRINT showed that more intensive blood pressure control produced a 25% reduction in the composite primary composite endpoint of cardiovascular events, stroke, and cardiovascular death. The intensive arm was so successful that SPRINT helped inform the 2017 high blood pressure clinical guidelines from the American Heart Association and American College of Cardiology.

Michelle Sullivan/MDedge News

The SPRINT MIND substudy, headed by Jeff D. Williamson, MD, of Wake Forest University, Winston-Salem, NC, asked whether intensive management had any effect on probable all-cause dementia or MCI, as well as imaging evidence of changes in white matter lesions and brain volume. It followed patients for up to 7 years and comprised 9,361 SPRINT subjects at least 50 years old (mean, 68 years) with at least one cardiovascular risk factor. Nearly a third (30%) were black, and 10% Hispanic. The primary outcome was incident probable dementia. Secondary outcomes were MCI and a composite of MCI and/or probable dementia. About a third had a SBP of 132 mm Hg or less, another third had a systolic pressure of 132-145 mm Hg, and the remainder had a systolic pressure greater than 145 mm Hg.

Physicians could use their choice of antihypertensive treatments. The study protocol encouraged, but did not mandate, thiazide-type diuretics as a first-line agent, followed by loop diuretics and beta-adrenergic blockers. Chlorthalidone was encouraged as the primary thiazide-type diuretic, and amlodipine as the preferred calcium-channel blocker.

The interventions did successfully control blood pressure, with a significant difference between the treatment groups. The mean SBP was 121.6 mm Hg in the intensive therapy group and 134.8 mm Hg in the standard group – a statistically significant difference of 13.3 mm Hg.

Dementia developed in 149 in the aggressive control group and 176 in the standard group – a nonsignificant difference of 17% (hazard ratio, 0.83). MCI developed in 287 in the intensive group and 353 in the standard treatment group. This amounted to a statistically significant 19% reduction. There was also a significant 15% reduction in the composite outcome of MCI or probable dementia in favor of intensive treatment.

As evidenced by the Alzheimer’s Association grant, dementia researchers chose to focus on SPRINT MIND’s positive secondary endpoints. At the AAIC meeting, Dr. Williamson even suggested that antihypertensive medications could be seen as disease-modifying agents for cognitive decline. Data support his claim: No dementia intervention yet tested has approached this level of success.

“I think we can say this is the first disease-modifying strategy to reduce the risk of MCI,” Dr. Williamson said during a press briefing. And although the primary endpoint – the 17% relative risk reduction for probable all-cause dementia – didn’t meet statistical significance, “It’s comforting to see that the benefit went in the same direction and was of the same magnitude..”

msullivan@mdedge.com

SOURCE: Williamson JD et al. JAMA 2019 Jan 28. doi:10.1001/jama.2018.21442.

A new iteration of the SPRINT MIND hypertension trial will seek to prove conclusively the original study’s tantalizing suggestion: that intensive blood pressure control decreases the risk of developing mild cognitive impairment (MCI) and, eventually, dementia.

SPRINT MIND 2.0 will re-recruit SPRINT MIND subjects and enable another follow-up cognitive assessment and other clinical tests as they remain on their standard of care blood pressure regimen. It is largely funded by an $800,000 grant from the Alzheimer’s Association.

Initially released last July at the Alzheimer’s Association International Conference, the results of the SPRINT MIND have now appeared online in JAMA. Although it failed to meet its primary endpoint of reducing dementia incidence, the study did score on two secondary endpoints. Patients who reduced their systolic blood pressure to less than 120 mm Hg were 19% less likely to develop MCI and 17% less likely to be diagnosed with all-cause dementia than were those who achieved a hypertension target of less than 140 mm Hg.

The secondary results, and positive movement in the primary results, sparked excitement in the dementia research community last summer. They have suggested that the median 5-year follow-up just wasn’t long enough to show any significant effects on dementia, which can take years to fully manifest. Adding 2 more years with SPRINT MIND 2.0 should be long enough to discern those benefits, if indeed they exist.

“SPRINT MIND 2.0 and the work leading up to it offers genuine, concrete hope,” Maria C. Carrillo, PhD, chief science officer for the Alzheimer’s Association, said in a press statement. “MCI is a known risk factor for dementia, and everyone who experiences dementia passes through MCI. When you prevent new cases of MCI, you are preventing new cases of dementia. The Alzheimer’s Association finds these data to be compelling and is committed to getting clarity and certainty on the dementia outcome by following participants for a longer period of time.”

The study strengthens the new and energetic push to find ways to prevent dementia, which has proven itself intractable in every drug study to date.

“This study is in line with where the field of dementia research is going: preventing memory loss earlier,” said Laurie Ryan, PhD, chief of the dementias of aging branch in the National Institute on Aging. “Much like we have research-based interventions for heart health and cancer prevention, we hope to have guidance based on this and subsequent studies that will more definitively show how to slow or even stop dementia well before symptoms appear.”

NIA director Richard J. Hodes, MD, agreed.

“Dementia continues to be a large public health challenge, and based on the primary results of this study, we still have yet to find an intervention strategy proven to reduce the risk of dementia,” he said in a press statement. “Nevertheless, the secondary results showing that intensive lowering of blood pressure may reduce risk for MCI, a known risk factor for dementia, gives us additional avenues to explore on the path to prevention.”

SPRINT MIND was a substudy of the Systolic Blood Pressure Intervention Trial (SPRINT). It compared two strategies for managing hypertension in older adults. The intensive strategy had a target of less than 120 mm Hg, while standard care had a target of less than 140 mm Hg. SPRINT showed that more intensive blood pressure control produced a 25% reduction in the composite primary composite endpoint of cardiovascular events, stroke, and cardiovascular death. The intensive arm was so successful that SPRINT helped inform the 2017 high blood pressure clinical guidelines from the American Heart Association and American College of Cardiology.

Michelle Sullivan/MDedge News

The SPRINT MIND substudy, headed by Jeff D. Williamson, MD, of Wake Forest University, Winston-Salem, NC, asked whether intensive management had any effect on probable all-cause dementia or MCI, as well as imaging evidence of changes in white matter lesions and brain volume. It followed patients for up to 7 years and comprised 9,361 SPRINT subjects at least 50 years old (mean, 68 years) with at least one cardiovascular risk factor. Nearly a third (30%) were black, and 10% Hispanic. The primary outcome was incident probable dementia. Secondary outcomes were MCI and a composite of MCI and/or probable dementia. About a third had a SBP of 132 mm Hg or less, another third had a systolic pressure of 132-145 mm Hg, and the remainder had a systolic pressure greater than 145 mm Hg.

Physicians could use their choice of antihypertensive treatments. The study protocol encouraged, but did not mandate, thiazide-type diuretics as a first-line agent, followed by loop diuretics and beta-adrenergic blockers. Chlorthalidone was encouraged as the primary thiazide-type diuretic, and amlodipine as the preferred calcium-channel blocker.

The interventions did successfully control blood pressure, with a significant difference between the treatment groups. The mean SBP was 121.6 mm Hg in the intensive therapy group and 134.8 mm Hg in the standard group – a statistically significant difference of 13.3 mm Hg.

Dementia developed in 149 in the aggressive control group and 176 in the standard group – a nonsignificant difference of 17% (hazard ratio, 0.83). MCI developed in 287 in the intensive group and 353 in the standard treatment group. This amounted to a statistically significant 19% reduction. There was also a significant 15% reduction in the composite outcome of MCI or probable dementia in favor of intensive treatment.

As evidenced by the Alzheimer’s Association grant, dementia researchers chose to focus on SPRINT MIND’s positive secondary endpoints. At the AAIC meeting, Dr. Williamson even suggested that antihypertensive medications could be seen as disease-modifying agents for cognitive decline. Data support his claim: No dementia intervention yet tested has approached this level of success.

“I think we can say this is the first disease-modifying strategy to reduce the risk of MCI,” Dr. Williamson said during a press briefing. And although the primary endpoint – the 17% relative risk reduction for probable all-cause dementia – didn’t meet statistical significance, “It’s comforting to see that the benefit went in the same direction and was of the same magnitude..”

msullivan@mdedge.com

SOURCE: Williamson JD et al. JAMA 2019 Jan 28. doi:10.1001/jama.2018.21442.

A new iteration of the SPRINT MIND hypertension trial will seek to prove conclusively the original study’s tantalizing suggestion: that intensive blood pressure control decreases the risk of developing mild cognitive impairment (MCI) and, eventually, dementia.

SPRINT MIND 2.0 will re-recruit SPRINT MIND subjects and enable another follow-up cognitive assessment and other clinical tests as they remain on their standard of care blood pressure regimen. It is largely funded by an $800,000 grant from the Alzheimer’s Association.

Initially released last July at the Alzheimer’s Association International Conference, the results of the SPRINT MIND have now appeared online in JAMA. Although it failed to meet its primary endpoint of reducing dementia incidence, the study did score on two secondary endpoints. Patients who reduced their systolic blood pressure to less than 120 mm Hg were 19% less likely to develop MCI and 17% less likely to be diagnosed with all-cause dementia than were those who achieved a hypertension target of less than 140 mm Hg.

The secondary results, and positive movement in the primary results, sparked excitement in the dementia research community last summer. They have suggested that the median 5-year follow-up just wasn’t long enough to show any significant effects on dementia, which can take years to fully manifest. Adding 2 more years with SPRINT MIND 2.0 should be long enough to discern those benefits, if indeed they exist.

“SPRINT MIND 2.0 and the work leading up to it offers genuine, concrete hope,” Maria C. Carrillo, PhD, chief science officer for the Alzheimer’s Association, said in a press statement. “MCI is a known risk factor for dementia, and everyone who experiences dementia passes through MCI. When you prevent new cases of MCI, you are preventing new cases of dementia. The Alzheimer’s Association finds these data to be compelling and is committed to getting clarity and certainty on the dementia outcome by following participants for a longer period of time.”

The study strengthens the new and energetic push to find ways to prevent dementia, which has proven itself intractable in every drug study to date.

“This study is in line with where the field of dementia research is going: preventing memory loss earlier,” said Laurie Ryan, PhD, chief of the dementias of aging branch in the National Institute on Aging. “Much like we have research-based interventions for heart health and cancer prevention, we hope to have guidance based on this and subsequent studies that will more definitively show how to slow or even stop dementia well before symptoms appear.”

NIA director Richard J. Hodes, MD, agreed.

“Dementia continues to be a large public health challenge, and based on the primary results of this study, we still have yet to find an intervention strategy proven to reduce the risk of dementia,” he said in a press statement. “Nevertheless, the secondary results showing that intensive lowering of blood pressure may reduce risk for MCI, a known risk factor for dementia, gives us additional avenues to explore on the path to prevention.”

SPRINT MIND was a substudy of the Systolic Blood Pressure Intervention Trial (SPRINT). It compared two strategies for managing hypertension in older adults. The intensive strategy had a target of less than 120 mm Hg, while standard care had a target of less than 140 mm Hg. SPRINT showed that more intensive blood pressure control produced a 25% reduction in the composite primary composite endpoint of cardiovascular events, stroke, and cardiovascular death. The intensive arm was so successful that SPRINT helped inform the 2017 high blood pressure clinical guidelines from the American Heart Association and American College of Cardiology.

Michelle Sullivan/MDedge News

The SPRINT MIND substudy, headed by Jeff D. Williamson, MD, of Wake Forest University, Winston-Salem, NC, asked whether intensive management had any effect on probable all-cause dementia or MCI, as well as imaging evidence of changes in white matter lesions and brain volume. It followed patients for up to 7 years and comprised 9,361 SPRINT subjects at least 50 years old (mean, 68 years) with at least one cardiovascular risk factor. Nearly a third (30%) were black, and 10% Hispanic. The primary outcome was incident probable dementia. Secondary outcomes were MCI and a composite of MCI and/or probable dementia. About a third had a SBP of 132 mm Hg or less, another third had a systolic pressure of 132-145 mm Hg, and the remainder had a systolic pressure greater than 145 mm Hg.

Physicians could use their choice of antihypertensive treatments. The study protocol encouraged, but did not mandate, thiazide-type diuretics as a first-line agent, followed by loop diuretics and beta-adrenergic blockers. Chlorthalidone was encouraged as the primary thiazide-type diuretic, and amlodipine as the preferred calcium-channel blocker.

The interventions did successfully control blood pressure, with a significant difference between the treatment groups. The mean SBP was 121.6 mm Hg in the intensive therapy group and 134.8 mm Hg in the standard group – a statistically significant difference of 13.3 mm Hg.

Dementia developed in 149 in the aggressive control group and 176 in the standard group – a nonsignificant difference of 17% (hazard ratio, 0.83). MCI developed in 287 in the intensive group and 353 in the standard treatment group. This amounted to a statistically significant 19% reduction. There was also a significant 15% reduction in the composite outcome of MCI or probable dementia in favor of intensive treatment.

As evidenced by the Alzheimer’s Association grant, dementia researchers chose to focus on SPRINT MIND’s positive secondary endpoints. At the AAIC meeting, Dr. Williamson even suggested that antihypertensive medications could be seen as disease-modifying agents for cognitive decline. Data support his claim: No dementia intervention yet tested has approached this level of success.

“I think we can say this is the first disease-modifying strategy to reduce the risk of MCI,” Dr. Williamson said during a press briefing. And although the primary endpoint – the 17% relative risk reduction for probable all-cause dementia – didn’t meet statistical significance, “It’s comforting to see that the benefit went in the same direction and was of the same magnitude..”

msullivan@mdedge.com

SOURCE: Williamson JD et al. JAMA 2019 Jan 28. doi:10.1001/jama.2018.21442.