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Intra-His bundle block. Clinical, electrocardiographic, and electrophysiologic characteristics
Eduardo M Andrea1, Jacob Atie, Washington A Maciel
1Hospital Universitário Clementino Fraga Filho - UFRJ, Instituto Estadual de Cardiologia Aloysia de Castro, Rio de Janeiro, RJ, Brazil. eandrea@openlink.com.br
Arquivos Brasileiros De Cardiologia
|November 26, 2002
Summary
Intra-His bundle block, a cause of second-degree atrioventricular block, frequently presents with syncope and is more common in elderly females. Electrocardiogram findings often show Mobitz I or 2:1 atrioventricular block.
Area of Science:
- Cardiology
- Electrophysiology
- Internal Medicine
Background:
- Intra-His bundle block is a specific type of conduction abnormality within the His bundle.
- It can lead to various degrees of atrioventricular block and associated symptoms.
Purpose of the Study:
- To characterize the clinical, electrocardiographic, and electrophysiologic features of patients with intra-His bundle block.
- To understand the prevalence and presentation of this condition during electrophysiologic studies.
Main Methods:
- Analysis of 16 patients with second-degree atrioventricular block and symptoms of syncope or dyspnea.
- Conventional electrophysiologic study (EPS) was performed to document intra-His bundle block.
Main Results:
- Intra-His bundle block was identified in all 16 patients during EPS.
- The most common clinical presentation was syncope or presyncope (68%).
- Electrocardiographic findings frequently included Mobitz I or 2:1 atrioventricular block.
Conclusions:
- Intra-His bundle block is a significant finding in patients with second-degree atrioventricular block and syncope.
- This condition is more prevalent in elderly individuals and females.
- Understanding these characteristics aids in diagnosis and management.