Catheter ablation of atrial tachycardia after CPVA revealed that 88% were re-entrant and related to gaps in prior lines, achieving freedom from AT/AF in 77% of patients at 13 months.
Observational (n=78)
What is the mechanism of atrial tachycardia occurring after circumferential pulmonary vein ablation for atrial fibrillation?
Most atrial tachycardias following circumferential pulmonary vein ablation for AF are re-entrant and related to gaps in prior ablation lines, highlighting the importance of achieving linear block during the initial procedure.
OBJECTIVES: The aim of this study was to determine the mechanism of atrial tachycardia (AT) that occurs after ablation of atrial fibrillation (AF). BACKGROUND: Patients who undergo catheter ablation of AF may develop AT during follow-up. METHODS: Seventy-eight patients underwent an ablation procedure for AT after circumferential pulmonary vein ablation (CPVA) for AF. The 3-dimensional maps from the AF and AT procedures were compared to determine whether AT arose from a prior ablation line. RESULTS: A total of 155 ATs were mapped, and the mechanism was re-entry in 137 (88%) and focal in 18 (12%). The most common left atrial (LA) ablation targets were the mitral isthmus, roof, and septum. The critical isthmus in 115 of the 120 LA re-entrant ATs (96%) traversed a prior ablation line, consistent with a gap-related mechanism. Catheter ablation was successful in 66 of the 78 patients (85%). After a mean follow-up of 13 +/- 10 months, 60 of the 78 patients (77%) were free of AT/AF without antiarrhythmic medications. Re-entrant septal AT was associated with recurrence (odds ratio 7.3; 95% confidence interval 1.5 to 36; p = 0.02), whereas PV isolation during the AT procedure was associated with a favorable outcome (odds ratio 0.17; 95% confidence interval 0.04 to 0.81; p = 0.03). CONCLUSIONS: Approximately 90% of ATs after CPVA are re-entrant, and nearly all are related to gaps in prior ablation lines. These findings suggest that the prevalence of these arrhythmias may be reduced by limiting the number of linear lesions, demonstration of linear block, and pulmonary vein disconnection during the initial AF procedure.
Chae et al. (Mon,) conducted a observational in Atrial tachycardia after circumferential pulmonary vein ablation of atrial fibrillation (n=78). Catheter ablation was evaluated on Freedom from AT/AF without antiarrhythmic medications. Catheter ablation of atrial tachycardia after CPVA revealed that 88% were re-entrant and related to gaps in prior lines, achieving freedom from AT/AF in 77% of patients at 13 months.