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A case of dissociation with interference of the heart is described and the underlying mechanism of the arrhythmia is discussed. The special features of the case are: For the last eleven years at least sinus bradycardia was present, as shown by the history and verified by electrocardiograms. There was electrocardiographic evidence of disturbances of conduction both in the bundle of His and in the auricles. Atrioventricular rhythm occurred at times, the impulses originating in the lower parts of the atrioventricular node, stimulating the auricles as well as the ventricles. Small doses of digitalis effected a symptomatic cure.