DSE vs. FFR in SCAD and BYSTANDER Lesions

Enrollment: * Patients with stable coronary artery disease (SCAD) and moderate coronary artery stenoses (30-70 %) * Patients with acute myocardial infarction and moderate stenosis of non-culprit arteries (NCL; BYSTANDER LESION) Aims: * To assess the diagnostic accuracy of dobutamine stress echocardiography (DSE) and invasive fractional flow reserve (FFR) measurement * To assess the prognostic impact of reclassification by a mismatching negative test Hypothesis: * DSE and FFR have similar prognostic value in both clinical settings (SCAD and NCL) * Considering the strong negative predictive value of both DSE and FFR, one negative test is sufficiently enough to defer revascularisation, even in the case of mismatch