# Pulsed-field ablation versus radiofrequency ablation in patients undergoing repeat catheter ablation for atrial fibrillation

## TL;DR

This study compares pulsed-field ablation and radiofrequency ablation for repeat heart procedures in patients with recurring atrial fibrillation.

## Contribution

The study is the first to assess pulsed-field ablation for repeat catheter ablation after failed thermal procedures.

## Key findings

- PFA and RFA had similar procedure times and safety outcomes in repeat ablation.
- PFA showed comparable arrhythmia-free survival rates as RFA after one year.
- PFA had longer fluoroscopic time but no additional complications compared to RFA.

## Abstract

Pulsed-field ablation (PFA) is noninferior compared with thermal energy sources such as radiofrequency ablation (RFA) or cryoballoon ablation for de novo pulmonary vein isolation (PVI). However, its potential value for repeat catheter ablation (CA) after unsuccessful thermal PVI has not been assessed.

This study aimed to compare the procedural characteristics, safety, and efficacy between PFA and RFA in patients undergoing repeat CA after previous thermal PVI.

Patients with recurrent atrial fibrillation (AF) undergoing repeat CA at a tertiary referral center were prospectively enrolled. All redo procedures were guided by a 3-dimensional electroanatomic mapping system and performed using either PFA or RFA.

A total of 185 patients underwent repeat CA for AF (median age 68 years [60–74], 31% female, 53% paroxysmal AF, and 47% persistent AF). PFA was used in 71 patients (38%), whereas RFA was used in 114 patients (62%). The median procedure time was similar between the PFA and RFA groups (61 minutes [50–71] vs 56 minutes [45–82] P = .956), whereas fluoroscopic time was longer in the PFA group (8 minutes [6–12] vs 4 minutes [2–8], P < .001). A total of 4 complications occurred, all in the RFA group. Recurrence-free survival rates after repeat CA were 61% and 69% in the PFA vs the RFA group after a follow-up of 365 days (Plog-rank = .082). Posterior wall isolation was more commonly performed in the PFA group (72% vs12%).

In patients undergoing repeat CA after thermal PVI, PFA resulted in similar procedural characteristics, safety, and arrythmia-free survival compared with RFA.