Follow-up
Patients were discharged 3±1 days after CA. After CA, we performed 12-lead ECG every 1 or 2 months and 24 h Holter recording at 6 and 12 months post-CA. We defined AF recurrence as any atrial tachyarrhythmia lasting ≥30 s detected on ECG after a 3-month blanking period during the 1-year observational period. Patients with AF recurrence were categorized into the Recurrence group, and those without AF recurrence were categorized into the Non-Recurrence group.