Addition of Six Short Lines on Pulmonary Vein Isolation

We randomly assigned 390 patients with symptomatic, paroxysmal AF to undergo catheter ablation with PVI (PVI group) alone or combined with 6 additional ablation lines extended outside the PVI circumferences at 1, 3 and 6 o'clock of left PV and 6, 9 and 11 o'clock of right PV (PVI+6L group). Patients received monthly 12-lead electrocardiogram, 24-hour Holter at 3, 6 and 9 months and 14-days continuous monitoring at 12 months to detect atrial tachyarrhythmia. The follow-up period was 12 months. The primary end point was freedom from AF recurrence between 91 and 365 days after catheter ablation. The secondary end points included the AF burden, procedural parameters, and complications.