Ablation and clinical endpoints
The primary ablation endpoint was catheter stability, defined by mean and maximal catheter excursion. The secondary clinical endpoint was one year freedom from AF recurrence, following a 3-month blanking period. Recurrence was defined as an atrial arrhythmia lasting longer than 30 seconds on ambulatory monitoring, or an atrial arrhythmia documented on a standard 12 lead electrocardiogram. Recurrences within 3 months were included if they necessitated a repeat ablation.