Key result
An interposed atrial depolarization during right atrial pacing prolonged subsequent A-V conduction by 0.03 to 0.13 seconds, demonstrating concealed conduction in the normal human heart.
Why the study?
Does an intervening atrial depolarization affect A-V conduction time in humans during right atrial pacing?
Observational
Does an intervening atrial depolarization affect A-V conduction time in humans during right atrial pacing?
This study provides direct evidence of concealed conduction in the normal human heart by showing that an interposed atrial depolarization prolongs subsequent A-V conduction.
Answers are grounded in this paper and cite their sources.
Alerts to concealed effects on AV timing in atrial pacing; leaves open its role in clinical arrhythmias.
The occurrence of 2:1 A-V block during right atrial pacing in man provided the opportunity to compare A-V conduction time with and without an intervening atrial depolarization at similar ventricular rates. The presence of the interposed atrial depolarization produced prolongation of the subsequent A-V conduction by 0.03 to 0.13 sec, and thus provided evidence of concealed conduction in the normal human heart.
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Carleton et al. (1966) conducted an observational in Normal human heart. Interposed atrial depolarization during right atrial pacing vs. No intervening atrial depolarization was evaluated on A-V conduction time (Prolongation by 0.03 to 0.13 sec). An interposed atrial depolarization during right atrial pacing prolonged subsequent A-V conduction by 0.03 to 0.13 seconds, demonstrating concealed conduction in the normal human heart.
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