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Congenitally corrected transposition of the great vessels: localization of the site of complete atrioventricular
The American Journal of Cardiology
|September 1, 1976
Insights
Complete atrioventricular block was found in a patient with congenitally corrected transposition of the great vessels. Electrophysiologic studies confirmed the block
Area of Science:
- Cardiology
- Electrophysiology
- Congenital Heart Disease
Background:
- Congenitally corrected transposition of the great vessels (ccTGA) presents unique challenges in cardiac conduction.
- Atrioventricular block (AV block) in ccTGA requires detailed electrophysiologic investigation.
Observation:
- His bundle electrograms were utilized to document complete atrioventricular block.
- The block was located proximal to the bundle of His.
Findings:
- A spontaneous rhythm, likely originating from the bundle of His, was identified.
- This rhythm demonstrated responsiveness to carotid sinus massage, atropine, and exercise (isometric and treadmill).
Implications:
- These findings correlate with recent anatomical studies of ccTGA.
- Understanding the electrophysiologic characteristics of AV block in ccTGA is crucial for patient management.
Abstract:
Complete atrioventricular block proximal to the bundle of His in a patient with congenitally corrected transposition of the great vessels was documented using His bundle electrograms. The spontaneous rhythnm probably originated from the bundle of His and was responsive to carotid sinus massage, atropine and isometric and treadmill exercise. These electrophysiologic observations are consistent with recent anatomic studies of congenitally corrected transposition of the great vessels.