The prognostic significance of cardiac magnetic resonance (CMR) derived parameters of myocardial and microvascular injury has not been fully elucidated yet in non-ST-Elevation myocardial infarction (NSTEMI) patients. In the present study the investigators aim to comprehensively investigate the prognostic significance of CMR in a prospective, multicentre registry cohort of NSTEMI patients undergoing early percutaneous coronary intervention (PCI). CMR will be performed within the first week following the index event. The primary endpoint is defined as a composite of death, reinfarction, and new congestive heart failure (major adverse cardiac events) at 12 months.

Inclusion Criteria: Patients are eligible for the study if they have: 1) ischemic symptoms in accordance with a possible NSTEMI diagnosis; 2) elevated cardiac troponin levels above the 99th percentile; and 3) identifiable culprit lesion during early invasive coronary angiography with performed PCI.

Exclusion Criteria: 1) STEMI; 2) presence of cardiogenic shock; 3) no identifiable culprit lesion or culprit lesion ineligible for PCI; 4) indication for acute bypass surgery; 5) age less than 18 years or more than 90 years; 6) pregnancy; and 7) typical contraindications to CMR (e.g. severe claustrophobia, implanted pacemakers and internal cardioverter defibrillators, cerebral or intracranial metallic implants, known allergy to gadolinium and creatinine clearance <30 mL/min).

Patients admitted to the chest pain units of three primary care clinics are screened for study participation.