Extended Period Outcomes of Posterior Box Isolation in 4 Randomized Atrial Fibrillation Catheter Ablation Trials

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Previous studies indicate that catheter-based posterior box isolation (POBI) and circumferential pulmonary vein isolation (CPVI) do not enhance rhythmic outcomes in atrial fibrillation catheter ablation.
• The efficacy of POBI in conjunction with CPVI for long-term atrial fibrillation management remains under investigation.

Purpose of the Study:

• To evaluate the long-term rhythm outcomes of comparing CPVI alone versus CPVI plus additional POBI.
• To analyze recurrence mechanisms in patients undergoing repeat procedures after initial ablation.

Main Methods:

• A meta-analysis of 4 randomized controlled trials involving 575 patients with atrial fibrillation.
• Comparison of clinical recurrence rates and major adverse cardiac events between CPVI alone and CPVI plus POBI groups.
• Analysis of recurrence mechanisms, including pulmonary vein reconnection and atrial tachycardia, in patients requiring repeat procedures.

Main Results:

• After a median 48-month follow-up, no significant differences in clinical recurrence or major adverse cardiac events were observed between the groups.
• The CPVI plus POBI group experienced significantly longer procedure times and a higher rate of atrial tachycardia recurrence.
• Pulmonary vein reconnection rates were similar, but re-entrant atrial tachycardia was more frequent in the POBI group, while extrapulmonary vein triggers were more common in the CPVI alone group.

Conclusions:

• The addition of POBI to CPVI does not improve long-term rhythm outcomes for atrial fibrillation catheter ablation.
• The findings suggest that POBI may increase the risk of atrial tachycardia without providing additional long-term rhythm control benefits.