Beyond pulmonary vein isolation for persistent atrial fibrillation: sequential high-resolution mapping to guide...

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Atrial fibrillation (AF) remains a significant clinical challenge, particularly persistent (PsAF) and long-standing persistent (LsPsAF) subtypes.
• Conventional ablation strategies, such as pulmonary vein isolation (PVI), have limitations in achieving long-term rhythm control for these complex AF types.

Purpose of the Study:

• To assess if individualized mapping (IM) can enhance AF ablation success rates beyond PVI alone.
• To evaluate the efficacy of an ablation strategy guided by IM in patients with PsAF and LsPsAF.

Main Methods:

• A pilot study involving 20 patients with PsAF or LsPsAF undergoing first-time ablation.
• Individualized mapping was performed after PVI, utilizing high-density mapping to identify focal and rotational activity.
• Ablation strategy was tailored to target identified arrhythmogenic areas, with comparison to a matched control cohort (CC) undergoing conventional ablation.

Main Results:

• The individualized mapping group achieved significantly higher cumulative freedom from AF at 1 year (94% vs. 75%, p=0.02) compared to the control group.
• Despite a higher comorbidity score in the IM group, superior AF-free survival was observed.
• Procedure duration was extended in the IM group (median increase of 31.5 minutes).

Conclusions:

• Individualized mapping-guided ablation demonstrates superior efficacy for achieving AF-free survival in persistent AF compared to conventional PVI.
• This approach holds promise as a primary treatment strategy for complex AF.
• Larger randomized trials are warranted to confirm these findings.