Related Experiment Video
Updated: May 19, 2026

Cox-Maze IV Procedure Concomitant with Valvular Surgery In Situs Inversus Dextrocardia: A Single-Center Experience in China
Published on: February 11, 2022
Exercise-induced Atrioventricular Block Progressing to Complete Atrioventricular Block 4 Years after the Initial
Tomo Komaki1,2,3, Yusuke Ajimu1,2, Toyonori Arinaga1,2
1The Cardiac Arrhythmia Center and EP Laboratory, Fukuoka University Hospital, Japan.
Abstract:
A 66-year-old man presented with dyspnea which occurred while running for 3 months. His resting electrocardiogram was normal, but a treadmill test revealed a 2:1 atrioventricular (AV) block when the sinus rate increased to 142 beats per minute. We diagnosed exercise-induced AV block and implanted a dual-chamber pacemaker. Initially, the ventricles were paced mainly during exercise. However, the patient became dependent on ventricular pacing at rest 4 years after the initial presentation, and progression to complete AV block was thereafter confirmed. This case highlights that exercise-induced AV block is not a benign condition, and AV conduction can deteriorate further over time.
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...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias
Dysrhythmias VI: Management of Dysrhythmias
Mitral Stenosis I: Introduction
Cardiomyopathy IV: Restrictive Cardiomyopathy

