[Atrial double-rhythm with total intraatrial block (author's transl)].

Report about a 52-year old patient with hypertension, who showed a transitory atrial double-rhythm and a total intraatrial block. The actions of one atrium with a frequency of 55--60/minute were transmitted regularly to the ventricles; the actions of the other atrium had a frequency of 90/minute and were not transmitted. In later controls of the ECG this phenomenon could not be seen again; at this time the rhythm was changing between a sinusrhythm with polytope ventricular extrasystoles and an absolute arrhythmia due to atrial fibrillation.