Follow-up
All patients were followed up at the outpatient clinic in our institution at 1,3, 6, 9, and 12 months after ablation. They were asked about symptoms and underwent both 12-lead ECG recording and 24-hour Holter ECG monitoring. A mobile ECG recorder was used at the discretion of the physician. AF recurrence was defined as any atrial tachyarrhythmias lasting for more than 30 seconds occurring after 3-month blanking period.