Original Article   

Minerva Cardiology and Angiology 2022 Mar 25

DOI: 10.23736/S2724-5683.22.05892-6

Copyright © 2022 EDIZIONI MINERVA MEDICA

language: English

Stepwise mapping and ablation algorithm in patients undergoing ablation of unstable, unmappable scar-based atrial tachycardias

Emir BASKOVSKI ¹, Basar CANDEMIR ¹ ✉, Timucin ALTIN ¹, Omer AKYUREK ¹, Volkan KOZLUCA ¹, Yakup Y. YAMANTURK ¹, Baris KAVVASOGLU ², Eralp TUTAR ¹

¹ Department of Cardiology, Ankara University, Ankara, Turkey; ² Hatay Egitim Arastirma Hastanesi, Hatay, Turkey

BACKGROUND: Scar based atrial tachycardia (AT)’s usually presents with a complex electrophysiological substrate. It is not uncommon that multiple instable ATs are present in a single patient. The aim of this study was to analyze clinical and electrophysiological characteristics of patients who had undergone ablation for instable ATs, and report outcomes of the stepwise substrate ablation procedure during the follow-up.
METHODS: Patients scheduled to undergo AT ablation were screened for enrollment to the study. When instable ATs were diagnosed a stepwise mapping and ablation algorithm was applied to all patients. After the procedure, patients were clinically and electrocardiographically followed.
RESULTS: Twenty-six patients were enrolled in the study. The mean number of ATs observed during the procedures is 3.1±0.7. At the end of the procedure, 18(69.2%) patients had isolated posterior wall. Anterior mitral line ablation was successfully performed in 13(50%), mitral isthmus line in 4(15.4%), roof line in 4(15.4%) patients. The mean follow-up was 13.5months±5.4. During the follow-up period 6(23.1%) patients developed arrhythmia recurrence.
CONCLUSIONS: A reasonable mid-term success can be expected in patients with instable ATs undergoing ablation according to the stepwise substrate modification algorithm, however due to extensive ablation it should be reserved for patients where conventional activation mapping cannot be performed.

KEY WORDS: Atrial fibrillation; Atrial tachycardia; Posterior wall isolation; Radiofrequency ablation; Substrate modification