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Cardiac conduction abnormalities during percutaneous balloon mitral or aortic valvotomy
M D Carlson1, I Palacios, J D Thomas
1Cardiac Unit, Massachusetts General Hospital, Boston 02114.
Circulation
|June 1, 1989
Summary
Percutaneous balloon valvotomy can prolong His-Purkinje conduction (HV interval) and QRS duration, potentially causing intraventricular conduction defects. However, complete heart block was not observed in this study of cardiac conduction changes.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Percutaneous balloon valvotomy is a common procedure for treating valvular heart disease.
- Understanding its impact on the cardiac conduction system is crucial for patient safety.
Purpose of the Study:
- To assess electrophysiologic changes in the cardiac conduction system during percutaneous mitral or aortic balloon valvotomy.
- To evaluate the incidence of conduction abnormalities post-procedure.
Main Methods:
- Prospective study of 19 patients undergoing percutaneous mitral/aortic balloon valvotomy.
- Recorded His bundle electrograms, measured AV node effective refractory period, and performed Holter monitoring.
- Follow-up ECGs were obtained to assess long-term changes.
Main Results:
- A significant prolongation of the maximum His-Purkinje conduction time (HV interval) was observed during valvotomy.
- Mean QRS complex duration increased significantly during and after the procedure, indicating intraventricular conduction delay.
- Five patients developed new intraventricular conduction defects or bundle branch blocks; four had persistent defects on follow-up.
Conclusions:
- Percutaneous balloon valvotomy can induce transient and sometimes persistent conduction abnormalities within the His-Purkinje system.
- While significant conduction delays occur, complete heart block was not observed in this patient cohort.