Related Experiment Video
Updated: Jul 17, 2026

Cox-Maze IV Procedure Concomitant with Valvular Surgery In Situs Inversus Dextrocardia: A Single-Center Experience in China
Published on: February 11, 2022
Detour conduction can mimic complete conduction block at the cavo-tricuspid isthmus
Takumi Yamada1, Yoshimasa Murakami, Vance J Plumb
1Division of Cardiovascular Diseases, University of Alabama at Birmingham, Birmingham, Alabama 35294-0019. takumi-y@fb4.so-net.ne.jp
Abstract:
A 54-year-old man with typical atrial flutter underwent linear ablation at the cavo-tricuspid isthmus. Though standard tricuspid annulus (TA) mapping and differential pacing suggested complete isthmus conduction block, electroanatomic mapping revealed that detoured conduction through a residual conduction gap around the inferior vena cava far from the TA mimicked complete conduction block. Though the double potential interval along the block line was not long enough to guarantee a complete line of block after eliminating the conduction gap, electroanatomic remapping accurately confirmed a complete block line, suggesting electroanatomic mapping may be the most reliable method to confirm complete isthmus conduction block.
More Related Videos
Related Concept Videos
Dysrhythmias IV: Characteristics of Bradyarrhythmias
Disturbances in Heart Rhythm
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Conduction System of the Heart
This system relies on the unique properties of nodal and Purkinje cells:...
Conduction System of the Heart
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
Mitral Regurgitation I: Introduction
Cardiovascular System Abnormal Findings II: Auscultation
Abnormal Heart Sounds
Gallops:

