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His-bundle parasystole masquerading as exercise-induced 2:1 atrioventricular block
1Department of Cardiovascular Medicine, Graduate School of Medicine, University of Tokyo, Japan. kasaokay-int@h.u-tokyo.ac.jp
Journal of Cardiovascular Electrophysiology
|August 22, 2001
Summary
This study details a rare case of pseudo-atrioventricular (AV) block caused by His-bundle parasystole. This condition mimicked exercise-induced AV block, highlighting a unique cardiac electrophysiology phenomenon.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
- Heart Rhythm Disorders
Background:
- Atrioventricular (AV) block is a common condition affecting heart rhythm.
- Exercise-induced AV block can present diagnostic challenges.
- His-bundle parasystole is a rare arrhythmia originating from the His bundle.
Observation:
- A patient presented with symptomatic pseudo-AV block during exercise.
- The condition mimicked typical exercise-induced 2:1 AV block.
- Electrophysiologic study was crucial for accurate diagnosis.
Findings:
- His-bundle parasystole was identified as the underlying cause.
- The fluctuating parasystolic cycle length was explained by modulated parasystole.
- Modulated parasystole may maintain stable 2:1 AV conduction within specific heart rate ranges during exercise.
Implications:
- This case expands the understanding of His-bundle parasystole and its clinical presentations.
- Recognizing modulated parasystole is important for diagnosing atypical AV block.
- Accurate diagnosis of His-bundle parasystole can guide appropriate patient management and treatment strategies.