Open AccessTachycardia cycle length alternans caused by alternate conduction velocity on the slow conduction zone in a postoperative scar‐related atrial tachycardia
Author(s) -
Su Chen,
Liu Menghui,
Ma Yuedong,
Wang Lichun
Publication year - 2019
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 - 10.1002/joa3.12177
Subject(s) - medicine , ablation , cardiology , tachycardia , atrial tachycardia , beat (acoustics) , nerve conduction velocity , thermal conduction , catheter ablation , physics , optics , thermodynamics
The underlying mechanism for stable beat‐to‐beat cycle length variability ( CL alternans) in scar‐related atrial tachycardia ( AT ) had not been elucidated clearly. We described a case with postoperative dual‐loop reentrant AT in right atrium. When the loop depended on cavo‐tricuspid isthmus was blocked by ablation, the AT transformed into a CL alternate tachycardia. High density and resolution mapping revealed that the CL alternans was caused by the alternate conduction velocities at the slow conduct region. A further ablation line was created from the slow conduction zone to the inferior vena cave, and afterward no AT was inducible.