Key result
Atrial pacing during His bundle recording in rate-related LBBB suggests underlying trifascicular disease.
Population
2 patients who developed left bundle-branch block with increase in heart rate. Case 1 is a 45-year-old man…
Design
Case_series
Authors
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May indicate trifascicular disease in some rate-related LBBB; hypothesis-generating and should not yet change practice.
Case Report (n=2)
Electrophysiological studies suggest that certain patients with rate-related left bundle-branch block have trifascicular disease based on differing HV interval responses.
Cannom et al. (1974) conducted a case report in Rate-related intermittent left bundle-branch block (n=2). Atrial pacing during His bundle recording was evaluated on Electrophysiological response in the ventricular specialized conduction system. Atrial pacing during His bundle recording in two patients with rate-related left bundle-branch block showed differing responses, suggesting some patients have trifascicular disease.
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