Randomized comparison between pulmonary vein antral isolation versus complex fractionated electrogram ablation for...

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Paroxysmal atrial fibrillation (PAF) is a common arrhythmia.
• Ablation therapy, including circumferential pulmonary vein antral isolation (PVAI) and complex fractionated electrogram (CFE) ablation, is used to treat drug-refractory PAF.
• Comparative data on the efficacy of PVAI versus CFE ablation for PAF is limited.

Purpose of the Study:

• To compare the efficacy of PVAI and CFE ablation as standalone strategies for drug-refractory PAF.
• To evaluate the recurrence rates of atrial fibrillation (AF) and atrial tachycardia (AT) after each ablation strategy.

Main Methods:

• A randomized trial involving 118 patients with drug-refractory PAF.
• Patients were assigned to either PVAI (n=60) or CFE ablation (n=58).
• Ablation guided by circular mapping catheter for PVAI and automated software for CFE, with crossover for persistent/inducible AF.

Main Results:

• After initial ablation, AF persisted/was inducible in 41% of PVAI patients versus 59% of CFE patients (P=0.05).
• At 22.6 months follow-up, PVAI was more effective in achieving AF/AT control off drugs (72% vs 57%) and had a significantly lower AT recurrence rate (11.9% vs 34.5%, P=0.004).
• CFE ablation alone resulted in a significantly lower overall success rate (38%) compared to PVAI alone (77%) or combined PVAI+CFE ablation (69%).

Conclusions:

• Circumferential pulmonary vein antral isolation (PVAI) is a more effective standalone strategy for paroxysmal atrial fibrillation (PAF) compared to complex fractionated electrogram (CFE) ablation.
• CFE ablation alone is associated with a higher recurrence rate of atrial tachycardia, making it less suitable as a sole therapeutic option for PAF.