Wenckebach type H-V block induced by digitalis intoxication.

The atrioventricular conduction system was studied by means of His bundle records in a preuremic patient during digitalis intoxication. A second degree A-V block of Wenckebach periodicity could be detected in the His-Purkinje system. Localization of the block has been found remarkable since, according to hitherto clinical studies, digitalis-induced Wenckebach block had been present commonly in the atrioventricular node.