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[Longitudinal dissociation of the bundle of His and infra-His block]
Archivos Del Instituto De Cardiologia De Mexico
|November 1, 1982
Insights
This study presents a unique case of advanced His bundle block, leading to a complete left bundle branch block. Normalization of QRS occurred after a distal His extrasystole, offering insights into His-Purkinje system block differential diagnosis.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Anatomy
Background:
- The His-Purkinje system is crucial for cardiac impulse conduction.
- His bundle block can manifest in various forms, impacting ventricular depolarization.
- Longitudinal dissociation of the His bundle is a rare finding.
Observation:
- A case of advanced supra-His block with an escape pacemaker at the proximal His bundle was observed.
- Longitudinal dissociation of the bundle of His was identified.
- Complete left bundle branch block and a prolonged HV interval were noted.
Findings:
- The observed His bundle alterations resulted in a complete left bundle branch block.
- A distal His extrasystole led to the normalization of the QRS complex.
- The case highlights the dynamic nature of His bundle conduction abnormalities.
Implications:
- This case provides valuable insights into the differential diagnosis of intra-His and infra-His blocks.
- Understanding longitudinal dissociation is important for interpreting complex conduction disturbances.
- Such cases can refine diagnostic criteria for His bundle abnormalities.
Abstract:
A case with advanced supra-His block and escape pacemaker at the proximal His block with longitudinal dissociation of the bundle of His is presented. These alterations caused a complete left bundle branch block and prolonged HV interval obtaining the normalization of the QRS after distal His extrasystole. We comment on the differential diagnosis between first degree intra-His and infra-His blocks.