LAUSR

We aimed to investigate whether the sequence of wide circumferential pulmonary vein isolation (PVI) ablation had an effect on the acute reconnection or long-term effectiveness in patients with paroxysmal atrial fibrillation (AF). One hundred consecutive paroxysmal AF patients, who were scheduled to accept PVI, were enrolled and randomized into two groups: (1) optimized group. Lesions were first applied to the anterior/posterior carina and the ridge between the left atrial (LA) appendage and the left pulmonary vein (PV). Then both circles were closed with continuous lesions. (2) Sequential group—continuous circular lesions were created counter-clockwise and started from the site of 6 o’clock. The primary endpoint was the freedom from non-blanking period recurrence of any atrial tachyarrhythmias lasting for 30 s or longer during the 1-year follow-up period after a single procedure. The secondary endpoint included safety endpoints, LA dwelling time, and fluoroscopy time/dose. Forty-nine patients in the optimized group and 48 patients in the sequential group were available for analysis. There was no difference between the AF-free rate of the optimized group and the sequential group (75.5% vs. 72.9%, p = 0.7715). Cox regression analysis found that acute reconnection had the potential to predict long-term recurrence at 1 year (Risk ratio 2.175, p = 0.0818). Both groups had similar safety endpoints, LA dwelling time, and fluoroscopy time/dose. Adjusting the ablation sequence of PVI by ablating the anterior/posterior carina and the ridge between the left PV and the LA appendage first did not improve 1-year AF-free rate for paroxysmal AF.