Key result
His bundle recordings in 50 children demonstrated that the H-V interval lengthened with age, while P'-H and H-V intervals did not differ significantly across different cardiovascular lesions.
Why the study?
Do His bundle intervals (P'-H and H-V) differ among children with normal hearts and various congenital heart diseases, or change with age?
Observational (n=50)
Do His bundle intervals (P'-H and H-V) differ among children with normal hearts and various congenital heart diseases, or change with age?
In children, the H-V interval lengthens with age, but His bundle intervals do not differ significantly between normal hearts and various congenital cardiovascular lesions.
His bundle potentials were recorded in 50 children. Eight had normal hearts, 11 had ventricular septal defects, seven had the tetralogy of Fallot, seven had secundum atrial septal defects, and eight had pulmonary valve stenosis. There were miscellaneous defects in nine children. Ages ranged from 2 weeks to 14 years. Two intervals were measured on recordings: (1) from the initial atrial activity (P') to the His bundle potential (H), the P'-H interval, and (2) from H to the initial ventricular activity (V), the H-V interval. The H-V interval lengthened with age. The P'-H and H-V intervals did not differ significantly when different cardiovascular lesions were compared.
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Roberts et al. (1972) conducted an observational in Normal hearts and congenital heart disease (n=50). His bundle recordings vs. Different cardiovascular lesions vs normal hearts was evaluated on P'-H and H-V intervals. His bundle recordings in 50 children demonstrated that the H-V interval lengthened with age, while P'-H and H-V intervals did not differ significantly across different cardiovascular lesions.
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