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[Paradoxical atrioventricular block within the bundle of His]
Archives Des Maladies Du Coeur Et Des Vaisseaux
|December 1, 1977
Summary
A 76-year-old patient experienced syncope due to atrio-ventricular block dependent on bradycardia. Electrophysiological study localized the block to the bundle of His, revealing a first-degree block related to diastolic duration.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Electrophysiology
Background:
- Syncope evaluation in elderly patients.
- Understanding atrio-ventricular conduction disturbances.
Observation:
- A 76-year-old patient presented with syncopal attacks.
- Basal electrocardiogram revealed no significant conduction delays.
- No tachycardia was observed, only bradycardia-dependent atrio-ventricular block.
Findings:
- Intracavitary electrophysiological investigation precisely localized the block.
- The block was identified within the main trunk of the bundle of His.
- A first-degree block, dependent on preceding diastole duration, was confirmed under basal conditions.
Implications:
- Highlights the importance of electrophysiological studies in diagnosing syncope.
- Provides insight into His bundle block localization.
- Contributes to understanding bradycardia-related conduction abnormalities.