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Related Experiment Videos

His-bundle parasystole masquerading as exercise-induced 2:1 atrioventricular block.

Y Kasaoka1, K Ajiki, N Hayami

  • 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
PubMed
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.

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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.

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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.