Coronary Flow Reserve (CFR) in Cardiovascular Risk Stratification

Inclusion Criteria: * Patients referred for myocardial ischemia screening Exclusion Criteria: * Patient already suffering from coronary disease with angioplasty, bypass surgery or myocardial infarction. * Contraindications related to the stress test: Acute Coronary Syndrome \<5 days Unstable angina Stenosis of left main artery untreated Uncontrolled severe rhythm disorders Uncontrolled heart failure * Contraindications to dipyridamole and regadenoson: Hypotension (systolic \<90mmHg) Severe pulmonary arterial hypertension Bradycardia \<40 beats / minute Sinusal Dysfunction and 2nd or 3rd degree Atrioventricular block Decompensated Heart Failure with Ejection Fraction \<25% Stenosis of supra-aortic trunks unilateral\> 70% or bilateral\> 50% Dipyridamole and regadenoson allergy * Patients with pacemaker, or who have had valvular surgery, * Well-known dilated cardiopathy * Pregnant or breastfeeding women, * Minor people * Persons under guardianship or under guardianship