The anticoagulation therapy is needed when rhythm control strategy is applied in atrial
fibrillation patients but adverse events such as major bleeding exist. This study aims to
examine the prognostic inpact of the duration of anticoagulation after radiofrequency
ablation of paroxismal atrial fibrillation in patients with low thromboembolic risk.
Paroxismal atrial fibrillation patients with 0 or 1 CHADS2-Vasc score undergoing
radiofrequency ablation is randomized into one month anticoagulation group and two months
anticoagulation group after the procedure. Thromboembolic event and adverse event including
major or minor bleeding would be compared.