BurdEn of NEw Onset Atrial FIbrillation in patienTs With Acute Myocardial Infarction

Inclusion Criteria: * Adult patients (\>18 years old); * Patient with AMI (including STEMI and NSTEMI) who developed NOAF during the index hospitalization; * Patients must have received in-hospital CEM for at least 5 days; * Patients must give informed consent. Exclusion Criteria: * Patients with a medical history of pre-existing AF; * Patients with a medical history of rheumatic valvular disease; * Patients with a medical history of sick sinus syndrome; * Patients undergoing emergent coronary artery bypass surgery; * Patients who suffer malignant tumors with an expected lifetime less than 1 year ; * Patients who refuse to receive CEM during hospitalization and the data of heart rhythm cannot be retrieved; * Patients who refuse to receive percutaneous coronary intervention (PCI) or have contraindications for PCI; * Patients who have died during the index hospitalization.