The goal of this observational study is to evaluate the clinical utility of cardiac magnetic resonance (CMR) in patients with acute myocardial infarction (AMI). This is a retrospective and prospective cohort study that has already enrolled a number of patients and will continue to enroll additional patients on a rolling basis.

The main question it aims to answer is:

How does CMR, performed acute phase, contribute to risk stratification, prognostic assessment, and long-term clinical management in patients with AMI?

Participants who have had an AMI will undergo CMR within one week of symptom onset. After discharge, they will be regularly followed up at 1, 3, 6, 9, and 12 months, and then every 6 months thereafter. Clinical outcomes will be collected during each follow-up visit.

This is an ambispective observational cohort study. The study will include patients who have already undergone CMR examination and meet the eligibility criteria, as well as consecutively enrolled patients who will undergo CMR during the prospective study period.

Inclusion Criteria:

• Patients aged 18 years or older.
• Patients diagnosed with acute myocardial infarction.
• Patients who complete cardiovascular magnetic resonance imaging during the acute phase after symptom onset.
• Patients with available clinical, CMR, and follow-up data.

Exclusion Criteria:

• History of previous myocardial infarction.
• Severe renal insufficiency, defined as estimated glomerular filtration rate <30 mL/min/1.73 m².
• Presence of malignant tumors.
• Poor CMR image quality unsuitable for analysis.

Patients diagnosed with AMI and who underwent CMR within the acute phase of symptom onset.