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Both Electrical Isolation and Lesion Homogeneity Should be Focused: Evidence From Repeat Atrial Fibrillation Ablation
Jiaju Li1, Aiju Tian1, Keping Chen1
1Cardiac Arrhythmia Center, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
Journal of Cardiovascular Electrophysiology
|June 23, 2026
Summary
Lesion homogeneity is crucial for preventing iatrogenic atrial tachyarrhythmia (AT) after atrial fibrillation (AF) ablation. Optimizing ablation strategies improves lesion quality and reduces recurrence.
Area of Science:
- Electrophysiology
- Cardiac Ablation
- Arrhythmia Mechanisms
Background:
- Recurrent atrial tachyarrhythmia (AT) is a significant complication post-catheter ablation for atrial fibrillation (AF).
- Pulmonary vein (PV) reconnection is a known cause, but the role of ablation lesion heterogeneity in iatrogenic AT is unclear.
Purpose of the Study:
- To investigate the clinical features of recurrent AT specifically caused by focal potentials resulting from ablation.
- To analyze the mechanisms contributing to AT recurrence after AF ablation.
Main Methods:
- Retrospective analysis of 113 patients undergoing repeat ablation for recurrent AT.
- High-resolution electroanatomic mapping to identify AT recurrence mechanisms.
- Categorization of recurrence into five types, including nonuniform ablation-related AT (iatrogenic).
Main Results:
- Gap conduction was the most frequent recurrence mechanism (51.3%).
- Nonuniform ablation-related AT occurred in 14.2% of cases.
- Nonuniform ablation-related AT often presented as AF and atrial flutter (AFL) mix, unlike AF-dominant gap-related recurrence.
Conclusions:
- Lesion homogeneity is vital for minimizing iatrogenic AT post-ablation.
- Ablation strategies should focus on optimizing electrical isolation and lesion quality.
- Findings guide refinement of ablation techniques and catheter technology development.
