In patients undergoing repeat ablation for recurrent atrial tachyarrhythmia, gap conduction was the most common mechanism of recurrence (51.3%), followed by nonuniform ablation-related AT (14.2%).
Observational (n=113)
What are the electrophysiological mechanisms of recurrent atrial tachyarrhythmia following catheter ablation for atrial fibrillation?
Lesion heterogeneity contributes to iatrogenic atrial tachyarrhythmias (14.2% of recurrences), emphasizing the need for ablation strategies that ensure both electrical isolation and lesion homogeneity.
ABSTRACT 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.
Li et al. (Tue,) conducted a observational in Recurrent atrial tachyarrhythmia following catheter ablation for atrial fibrillation (n=113). Prior catheter ablation for atrial fibrillation was evaluated on Mechanisms of atrial tachyarrhythmia recurrence. In patients undergoing repeat ablation for recurrent atrial tachyarrhythmia, gap conduction was the most common mechanism of recurrence (51.3%), followed by nonuniform ablation-related AT (14.2%).