Evaluation of the Benefit of Exercise Testing for the Diagnosis of Obstruction in the Coronary Arteries of the Heart

Double product DP (product of systolic blood pressure and heart rate) is directly related to the myocardial oxygen consumption (MVO2). Since O2 extraction by the myocyte in maximal at rest, only an increase in coronary blood flow can increase MVO2 during exercise. Therefore, if a coronary stenosis limits the maximal coronary flow, it will limit MVO2 and DP at exercise. Patients with both an exercise test and a coronary artery imaging (cardiac CT or coronary angiography) within 3 months, are included. DP increase (DP max/DP at rest) is measured during a maximal, symptom-limited exercise on a cycloergometer. DP at rest is measured either before the exercise test, at the end of the recovery period or during a visit to the cardiologist in the 2 months of the test, whichever is the smallest. The predictive power to detect a significant coronary artery stenosis is assessed by computing a Receiving Operating Characteristic (ROC) curve, its area under the curve, sensitivity, specificity, and decision thresholds. Number expected: 100-120 Time period of data collection: 1/1/2019 to 3/1/2022