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Women experience more severe arrhythmogenic substrates. This study hypothesized that an extensive ablation strategy, such as linear ablation and/or complex fractionated atrial electrogram (CFAE) ablation in addition to pulmonary vein isolation (PVI-plus), might be effective for women, whereas the PVI alone strategy (PVI-alone) might be sufficient for men to maintain sinus rhythm. The aim of this study was to test this hypothesis.Methods and Results: This study is a post-hoc subanalysis of the EARNEST-PVI trial focusing on sex differences in the efficacies of different ablation strategies. The EARNEST-PVI trial was a prospective, multicenter, randomized, and open-label non-inferiority trial in patients with persistent AF. The primary endpoint was recurrence of AF, atrial flutter, or atrial tachycardia. The EARNEST-PVI trial randomized 376 (76%) men (PVI-alone 186, PVI-plus 190) and 121 (24%) women (PVI-alone 63, PVI-plus 58). The event rate was significantly lower for men and numerically lower for women in the PVI-plus than the PVI-alone group, and there was no interaction between men and women (hazard ratio, 0.641; 95% confidence interval, 0.417-0.985; P value, 0.043 for men vs. hazard ratio, 0.661; 95% confidence interval, 0.352-1.240; P value, 0.197 for women; P value for interaction, 0.989).

Sex Differences in the Efficacy of Pulmonary Vein Isolation Alone vs. Extensive Catheter Ablation in Patients With Persistent Atrial Fibrillation