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Second degree His-Purkinje block during his bundle pacing.
The American Journal of Cardiology
|May 22, 1978
Summary
This study provides the first evidence of Wenckebach and 2:1 His-ventricular (H-V) block during His bundle pacing. These findings help identify conduction disturbances distal to the pacing site, even without typical diagnostic criteria.
Area of Science:
- Electrophysiology
- Cardiology
- Cardiac Pacing
Background:
- His bundle pacing is an emerging technique for cardiac resynchronization therapy.
- Understanding conduction disturbances during His bundle pacing is crucial for its clinical application.
- Previous studies have not clearly demonstrated Wenckebach or 2:1 His-ventricular (H-V) block during His bundle pacing.
Observation:
- This study utilized simultaneous intracardiac electrograms.
- A comparative analysis was performed between selective His bundle pacing and high right atrial pacing at identical rates.
- The presence of Wenckebach and 2:1 H-V block during His bundle pacing was observed.
Findings:
- Clear evidence for Wenckebach and 2:1 H-V block during His bundle pacing is presented for the first time.
- Conduction disturbances distal to the paced His bundle site were identified.
- These findings were established despite the absence of constant stimulus-V intervals, a usual criterion for diagnosing selective His bundle pacing.
Implications:
- This research advances the understanding of conduction abnormalities in His bundle pacing.
- The findings may refine diagnostic criteria for His bundle pacing complications.
- This work contributes to the safe and effective implementation of His bundle pacing strategies.