[Action of chloro-acetyl-ajmaline on the electrical properties of the human heart].

The electrophysiological changes caused by the intra-atrial injection of 1.5 mg/kg of chloro-acetyl-ajmaline were studied in 23 patients by recording the His potential and by the stimulustest method. The length of the basal cycle being kept constant by atrial stimulation, measurements were made before and after the injection, on the one hand of the -VA node conduction time (A-H interval) and the infra-His conduction time (H-V interval) and on the other of the refractory periods of the right auricle, A-V node, and the His-Purkinje system.