Abstract Background While pulsed-field ablation (PFA) holds promise for the initial catheter ablation performing pulmonary vein (PV) isolation (PVI) in patients with atrial fibrillation (AF), a repeat procedure remains necessary for those experiencing recurrent atrial tachyarrhythmia (ATA). This study aimed to evaluate the clinical outcomes of repeat procedures following the initial PFA in patients with recurrent ATA by comparing that following the initial CBA. Methods Patients who underwent a second ablation for recurrent ATA following initial PVI with pentaspline PFA or cryoballoon ablation (CBA) were included. Repeat ablation utilized radiofrequency current ablation with three-dimensional mapping guidance, involving repeat PVI combined with linear ablations when necessary. Acute data, such as documented arrhythmia before the repeat procedure, the number of reconnected PVs, procedural characteristics, and clinical follow-up, were analyzed. Results In total, 110 patients underwent initially successful PVI with PFA (N = 51) and CBA (N = 59), followed by a repeat procedure for recurrent ATA with a mean time interval of 365±299 days between the two procedures. The primary indication at the repeat procedure was atrial tachycardia (AT) in the PFA group (N = 27, 53%) and AF in the CBA group (N = 47, 80%). The overall PV reconnection rate per vein was 22.1%, with no significant difference between the two groups (19.1% in PFA vs. 24.7% in CBA, P = 0.16). Repeat PVI was successfully performed in all patients with PV reconnection (41.2% in PFA vs. 55.9% in CBA, P = 0.12). PV reconnection was most commonly found at the right inferior PV in both groups (25.5% vs. CBA; 32.2%, P = 0.44). Additional substrate modification was conducted in 76.5% of the PFA group and 74.6% in the CBA group, respectively (P = 0.82). The mean follow-up period was 349±280 days. The Kaplan-Meier curve indicated no statistical significance in the 1-year arrhythmia-free survival after the repeat procedure (62.4% in PFA vs. and 73.0% in CBA group, P = 0.54, Figure). Conclusion Comparable lesion durability between the initial PVI with PFA and CBA was unveiled during the repeat ablation. The second ablation for recurrent arrhythmia following initial PFA demonstrated a favorable clinical success rate at one year after the subsequent procedure, showing no significant difference compared to repeat ablation subsequent to CBA.arrhythmia-free survival after the repe

Comparative analysis of clinical outcomes in repeat ablation for recurrent atrial tachyarrhythmia following initial pulmonary vein isolation with pulsed-field ablation and cryoballoon ablation