Clinical follow-up
Anti-arrhythmic drugs (AADs) were prescribed after ablation according to the discretion of the patient’s attending cardiologist. Twelve-lead electrocardiograms (ECGs) were recorded at every follow-up visit or an emergency visit due to symptoms suggestive of an arrhythmia recurrence. In addition, 24-hour Holter ambulatory ECG monitoring was performed to detect recurrence of paroxysmal arrhythmias. An arrhythmia recurrence was defined as any documented atrial arrhythmia lasting longer than 30 seconds after the initial 90-day blanking period.