Transient New-Onset Atrial Fibrillation Is Associated With Poor Clinical Outcomes in Patients With Acute Myocardial Infarction

Background:Atrial fibrillation (AF) is considered to be associated with poor clinical outcomes in patients with acute myocardial infarction (AMI). However, it remains uncertain whether transient new-onset AF (NOAF) during AMI has a subsequent increased risk of poor clinical outcomes.Methods and Results:Transient NOAF was defined as AF that developed during AMI without a prior history and not documented for 1 month after discharge. The primary endpoints were major adverse cardiac events (MACE) and all-cause death. We enrolled 2,105 consecutive AMI patients. Overall, AF was observed in 209 (9.9%) and transient NOAF occurred in 102 (4.8%) among 150 patients (7.1%) with NOAF. The transient NOAF group showed higher 1-month (21.8 vs. 7.0%, P