Evidence of Concealed Atrioventricular Conduction in Man

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Abstract
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.