[Transient supernormality of AV-conduction (author's transl)].

A case is presented which is believed to demonstrate a transient supernormal phase of av-conduction in the presence of av-block complicating acute inferior wall myocardial infarction. During the initial period following the infarct there was a regular av-escape rhythm without av-conduction. Then on the 12th and 13th day supernormal av-conduction occurred. At the end of this period the supernormal phase became longer and more atrial impulses were conducted to the ventricles. Following the administration of atropine, there was a shortening of the supernormal phase to the previous values. The ECG taken one day later revealed normal av-conduction. It appears that supernormality occurred as a transient phenomenon during the phase of restitution of av-block, possibly by the ventricular complexes retrogradely invading the av-node.