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Updated: Jun 25, 2026
Determination of Continuity Index Values in Atrial Fibrillation Ablation with Proactive Esophageal Cooling
Published on: April 19, 2024
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.
Background:
Recurrent atrial tachyarrhythmia (AT) remains a major challenge following catheter ablation for atrial fibrillation (AF). While pulmonary vein (PV) reconnection is a well-recognized mechanism, the contribution of lesion heterogeneity to iatrogenic AT is not clearly defined.
Objective:
To analyze the clinical characteristics of recurrent AT caused by ablation-induced focal potentials.
Methods:
We retrospectively analyzed 113 patients who underwent repeat ablation for recurrent AT. Mechanisms of AT recurrence were identified using high-resolution electroanatomic mapping and categorized into five types. Nonuniform ablation-related AT-considered iatrogenic-was defined as focal or localized reentrant ATs arising from regions of prior ablation.
Results:
Gap conduction was the most common mechanism of recurrence (51.3%), followed by other mechanisms (27.4%) and nonuniform ablation-related AT (14.2%). The number of reconnected PVs was not significantly associated with the timing of all-mechanism recurrence. Nonuniform ablation-related ATs frequently presented as a combination of AF and atrial flutter (AFL), whereas gap-related recurrence typically manifested as AF.
Conclusion:
Lesion homogeneity plays a critical role in minimizing iatrogenic ATs, highlighting the importance of ablation strategies that optimize both electrical isolation and lesion quality. These findings offer insights for the refinement of ablation techniques and the development of improved catheter technologies.
