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- W1979451239 abstract "Time dependent changes in the electrophysiological properties of the atrioventricular conducting system (AVCS) were determined at two or more cycle lengths (CL) in 22 patients using bundle of His (H) electrograms, incremental atrial pacing and atrial extrastimulus method. The atrioventricular (A-H interval) and intraventricular (H-V interval) conduction times and refractory periods (RP) of the atrium, the A-V node (AVN) and His-Purkinje system (HPS) were measured during the control period, and repeat measurements were made after a 30 minute interval in eight patients (group A), after a 60 minute interval in nine (group B) and after 30 and 60 minute intervals in five (group C). No statistically significant changes from control values were seen after 30 and 60 minute intervals in any group in sinus rate, A-V nodal conduction time and the onset of A-V nodal Wenckebach block. H-V intervals were identical to the control values in all groups. Insignificant changes from control values occurred in RP of the atrium and HPS. Only the functional refractory period (FRP) of the AVN showed a statistically significant decrease from control values in groups B and C. This decrease could be explained by changes in autonomic tone. These observations in general confirm the reproducibility of electrophysiological properties of AVCS within one hour, and further support the validity of the techniques utilized in this and previously reported studies in the evaluation of cardioactive drugs." @default.
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- W1979451239 date "1975-12-01" @default.
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- W1979451239 title "Time dependent changes in the functional properties of the atrioventricular conduction system in man." @default.
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- W1979451239 doi "https://doi.org/10.1161/01.cir.52.6.1012" @default.
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