Open AccessUnidirectional block on the mitral isthmus during radiofrequency application for perimitral atrial tachycardia
Author(s) -
Yamashita Seigo,
Yamane Teiichi,
Matsuo Seiichiro,
Ito Keiichi,
Narui Ryohsuke,
Hioki Mika,
Tanigawa Shinichi,
Tokuda Michifumi,
Inada Keiichi,
Date Taro,
Sugimoto Kenichi,
Yoshimura Michihiro
Publication year - 2013
Publication title -
journal of arrhythmia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.463
H-Index - 21
eISSN - 1883-2148
pISSN - 1880-4276
DOI - 10.1016/j.joa.2012.12.006
Subject(s) - medicine , cardiology , atrial tachycardia , tachycardia , atrial fibrillation , radiofrequency ablation , catheter ablation , radiofrequency catheter ablation , ablation , mitral annulus , diastole , blood pressure
We present the case of a patient who developed regular, narrow QRS tachycardia after ablation for long‐standing persistent atrial fibrillation. During the electrophysiological study, this tachycardia was diagnosed as macroreentrant atrial tachycardia circulating around the mitral annulus. Catheter ablation was performed to treat the tachycardia by targeting the linear region between the annulus and the left inferior pulmonary vein. Although linear radiofrequency application along the mitral isthmus (MI) line resulted in the termination of this tachycardia, a unidirectional conduction block was observed through the MI. Bidirectional conduction block was subsequently achieved by delivering supplemental radiofrequency energies at the gap on the MI.