BARCELONA – Two noninvasive imaging methods for assessing coronary artery disease – cardiac magnetic resonance (CMR) and positron emission tomography using rubidium stress (RbPET) – had nearly identical accuracy for ruling-in or ruling-out coronary disease, making them for at least the time being equally appropriate to use when assessing low- or intermediate-risk patients with symptoms suggestive of possible coronary disease in a prospective, multicenter study with 372 patients.
that used fractional flow reserve assessment via invasive coronary angiography in each patient in the study as the arbiter of the true extent of coronary disease, reported , at the annual congress of the European Society of Cardiology.
This result is good news for practice because clinicians can feel free to use whichever of the two assessment methods is most feasible for each patient, said Dr. Bøttcher, a researcher at Aarhus (Denmark) University Hospital. But the study was limited by its size, and he hopes to run a future study with many more patients to try to more definitively compare RbPET and CMR.
‘The techniques are probably interchangeable’
“There is a very clear result from the data: The performance of the two modalities is similar in the population studied,” commented, professor of cardiology and imaging at the University of Glasgow (Scotland), and designated discussant for the report. “The techniques are probably interchangeable,” he said.
Dr. Bøttcher and his associates designed the Danish Study of Non-Invasive Diagnostic Testing in Coronary Artery Disease 2 (2019 guidelines of the European Society of Cardiology for the management of patients with chronic coronary syndromes, specifically low- or intermediate-risk patients who present with symptoms of possible coronary disease who have been identified as having possibly stenotic coronary lesions using coronary CT angiography. The guidelines cite using noninvasive imaging at this point prior to invasive angiography, but note that the relative performance of the various imaging options available for this step in unknown, said Dr. Bøttcher.) to address a knowledge gap highlighted in the
The researchers enrolled 372 patients at any of four hospitals in Denmark who agreed to participate and had a positive result on a coronary CT examination performed to assess their symptoms of coronary disease. (These 372 patients came from an initial pool of people that was fourfold larger, but three-quarters had negative findings on their coronary CT examination.) Clinicians had referred all of these patients to invasive angiography with fractional flow reserve assessment, and prior to that procedure they each underwent both a RbPET and a CMR examination for the purpose of this study. The researchers used each patient’s eventual invasive angiography result as the definitive determinant of their coronary disease. These patients averaged 64 years old, and 71% were men.
This analysis showed that for all 372 patients RbPET had 63% sensitivity and 87% specificity for identifying hemodynamically obstructive coronary disease, with rates of 60% and 85%, respectively, for CMR. In the subgroup of 71 patients (19%) who had obstructive coronary disease when examined by invasive angiography the sensitivity and specificity of the RbPET examination was 90% and 78%, and for CMR the sensitivity and specificity was 83% and 76%, Dr. Bøttcher reported.