This study aims to evaluate the sensitivity and specificity of a multi-sensor wireless pressure microcatheter for the diagnosis of CMD in patients with ANOCA/INOCA, using quantitative myocardial perfusion imaging of cardiac magnetic resonance (CMR) as a reference.
Age ≥ 18 years, gender not limited;
Symptoms of angina pectoris, or objective evidence of myocardial ischemia (e.g., electrocardiogram, myocardial injury markers, etc.);
Visual assessment of coronary angiography shows diameter stenosis < 50% and FFR > 0.8 (or cRR > 0.89);
Microvascular function assessment is planned;
Acute myocardial infarction, PCI, CABG, or valvular surgery following angiography within the past 30 days;
Severe valvular disease requiring surgical or interventional treatment;
Chest pain with known non-ischemic causes (e.g., pericarditis, pulmonary hypertension, esophageal spasm);
Contraindications to CMR (e.g., certain types of pacemakers or defibrillators, severe claustrophobia);