Post-procedural Follow up
After discharge, all patients underwent a 24-hour Holter monitoring every three months for one year and every six months thereafter. Patients were advised to return to our hospital or nearby clinics to record a 12-lead electrocardiogram when patients experienced symptoms suggestive of AF recurrence. Otherwise, patients were offered to undergo additional 24-hour Holter monitoring or patient-driven event monitor (HCG-801, Omron Healthcare Co., Kyoto, Japan) according to the duration and frequency of the symptoms. In patients with a cardiac implantable electronic device, AF recurrence was also monitored with the device. AF recurrence was defined as the appearance of sustained AF or atrial tachycardia (AT) lasting more than 30 seconds. The first three months after the procedure was the blanking period.