Follow-up
Anticoagulation was discontinued for three months after the index procedure. All patients were followed at one, three, six, and 12 months after the ablation procedure. Moreover, 12-lead electrocardiography (ECG) was performed at every visit, and 24 h Holter ECG monitoring was performed at three months and 12 months after ablation. If patients had a symptom event even if no AF was documented in the Holter ECG, portal ECG monitoring (hcg-801 heartscan, Omron, Japan) was used.