Sequential versus optimized pulmonary vein isolation for paroxysmal atrial fibrillation: a pilot study

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Paroxysmal atrial fibrillation (AF) is a common arrhythmia requiring effective treatment.
• Pulmonary vein isolation (PVI) is a standard ablation procedure for AF.
• The sequence of lesion application during PVI may influence procedural outcomes.

Purpose of the Study:

• To evaluate if altering the sequence of wide circumferential PVI ablation impacts acute reconnection or long-term efficacy in paroxysmal AF patients.
• To compare an optimized ablation sequence (targeting specific anatomical areas first) against a standard sequential PVI approach.

Main Methods:

• One hundred paroxysmal AF patients were randomized into two groups: optimized PVI sequence and sequential PVI sequence.
• The optimized group targeted anterior/posterior carina and LA appendage-PV ridge first, followed by lesion closure.
• The sequential group used continuous counter-clockwise lesions. The primary endpoint was 1-year freedom from atrial tachyarrhythmia recurrence.

Main Results:

• No significant difference in the 1-year AF-free rate was observed between the optimized (75.5%) and sequential (72.9%) groups.
• Acute reconnection showed a trend towards predicting long-term recurrence (Risk ratio 2.175, p=0.0818).
• Both groups exhibited similar safety profiles, left atrial dwelling times, and fluoroscopy exposure.

Conclusions:

• The specific sequence of PVI ablation, including targeting the anterior/posterior carina and LA appendage-PV ridge first, does not enhance the 1-year AF-free rate in paroxysmal AF patients.
• The findings suggest that the overall completeness of PVI may be more critical than the precise sequence of lesion delivery.
• Further research may explore other factors influencing PVI success beyond ablation sequence.