Follow-up after the procedure
All patients were given follow-up in the outpatient clinic at 1, 3, 6, 9, and 12 months after the procedure and every 6 months thereafter. Atrial tachyarrhythmia (ATA) recurrence was evaluated according to patient symptoms, electrocardiographic recordings, and 24-h ambulatory monitoring (3, 6, 9, and 12 months after the ablation and every 6 months thereafter). Patients with palpitations were encouraged to use portable electrocardiographic monitoring (HCG-801R; Omron, Kyoto, Japan). Recurrence was defined as recurrent symptoms and/or detection of ATAs using aforementioned modalities or data provided by cardiac implantable electrical devices (lasting >30 s) after a 2-month blanking period from the ablation procedure without any anti-arrhythmic drugs (AADs). If AAD was administered for patient after the procedure, it was considered as “ATA recurrence.”