Related Experiment Videos
Electrophysiologic and pathologic correlations in six cases of atrioventricular block
Insights
Electrophysiology studies correlate well with pathology in cardiac conduction disorders. Prolonged intervals like A-H and His potentials indicate specific involvement of the atrioventricular node and His bundle, respectively.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Pathology
Background:
- Understanding cardiac conduction system diseases is crucial for diagnosis.
- Electrophysiologic (EP) studies and pathologic findings are key diagnostic tools.
Observation:
- Prolonged A-H intervals suggest atrioventricular (A-V) nodal involvement.
- Prolonged His potential duration indicates His bundle involvement.
- Complete block distal to the His bundle suggests disruption of both bundle branches.
Findings:
- A-V nodal and His bundle infiltration correlated with A-H block and His potential prolongation.
- Severe fibrosis in bundle branches was observed in cases with complete block.
- Trifascicular disease was suggested by right bundle branch block, left axis deviation, and H-V prolongation.
Implications:
- Electrophysiologic findings closely correlate with pathologic findings in cardiac conduction abnormalities.
- Lesions in the His bundle's penetrating portion can cause A-H block.
- This correlation aids in diagnosing and understanding the severity of conduction system disease.
Abstract:
1) A prolonged A-H interval suggested A-V nodal involvement. 2) A prolonged duration of the His potential suggested moderate His bundle involvement. 3) Complete block distal to H appeared to reflect total disruption of both bundle branches. 4) The lesion at the penetrating portion of the His bundle could be responsible for A-H block. 5) A-H block occurred in a case of cellular infiltration in the A-V node and the His bundle, in which bilateral bundle branch showed severe fibrosis. 6) A combination of right bundle branch block, marked left axis deviation and H-V prolongation suggested trifascicular disease. 7) In case 6, there was a severe pathologic lesion at the origin of the left bundle branch, yet left bundle branch block was not indicated electrocardiographically. This study revealed a close correlation between electrophysiologic and pathologic findings in 4 out of 6 cases.