Key result
In 27 patients with PR prolongation and intraventricular conduction defects, P-H was prolonged in most (including 8 of 12 with LBBB), while H-Q was prolonged in 10 of 12 patients with LBBB.
Why the study?
What are the electrophysiological characteristics of first-degree atrioventricular block with intraventricular conduction disturbance?
Population
27 patients with PR prolongation and intraventricular conduction disturbances
Design
Case_series
Authors
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May inform EP localization in first-degree AV block with LBBB; hypothesis-generating for conduction disease patterns.
Observational (n=27)
What are the electrophysiological characteristics of first-degree atrioventricular block with intraventricular conduction disturbance?
In patients with first-degree AV block and intraventricular conduction delay, PR prolongation is primarily due to AV nodal delay, but those with LBBB frequently have additional His-Purkinje system disease.
Rosen et al. (1971) conducted an observational in PR prolongation and intraventricular conduction disturbances (n=27). His bundle electrogram recording was evaluated on P-H and H-Q intervals. In 27 patients with PR prolongation and intraventricular conduction defects, P-H was prolonged in most (including 8 of 12 with LBBB), while H-Q was prolonged in 10 of 12 patients with LBBB.
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