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(Circulation. 1966;34:756.)
© 1966 American Heart Association, Inc.

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Evidence of Concealed Atrioventricular Conduction in Man

RICHARD A. CARLETON M.D.¹ JOHN S. GRAETTINGER M.D.¹

¹ From the Section of Cardio-Respiratory Diseases, Division of Medicine, Presbyterian-St. Luke's Hospital, and the Department of Medicine, University of Illinois College of Medicine, Chicago, Illinois.

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.