Key result
His bundle electrogram recordings in 12 patients with atrial fibrillation revealed frequent ventricular, fascicular, and junctional beats, and concealed penetration in the fascicular system.
Observational (n=12)
His bundle electrograms in patients with atrial fibrillation reveal that ventricular, fascicular, and junctional beats can often be recognized, and concealed penetration of atrial impulses in the fascicular system may occur.
His bundle electrograms may identify concealed conduction in AF; hypothesis-generating for ventricular response mechanisms and needs prospective validation.
His bundle electrograms were recorded in 12 patients with atrial fibrillation. In all cases but one, the dominant rhythm was atrial fibrillation. In 1 case the dominant rhythm was fascicular tachycardia due probably to digitalis overdosage. However ventricular, fascicular and junctional beats could be often recognized on His bundle tracings, even when QRS configuration was similar to supraventricular conducted beats due to atrial fibrillation. In the patients in whom sinus rhythm occurred, the H-V interval was unchanged. Although it is admitted that during atrial fibrillation the zone of concealment of A-V conduction is in the A-V nodal area, concealed penetration of atrial impulses in the fascicular system may be encountered in patients not treated with digitalis.
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Gavrilescu et al. (1976) conducted an observational in Atrial fibrillation (n=12). His bundle electrogram recording was evaluated. His bundle electrogram recordings in 12 patients with atrial fibrillation revealed frequent ventricular, fascicular, and junctional beats, and concealed penetration in the fascicular system.
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