Data derived from clinical, electro- and polycardiographic observations of 68 patients subjected to electric stimulation therapy are presented. The evaluation of late results of the treatment showed that clinical factors such as the patients' age, the nature of the affection, the degree of cardiac insufficiency, the standing of auricular fibrillation are not decisive in determining indications and contraindication for electric stimulation therapy. A considerable worsening of the cardiac dynamics with developing fibrillation arrhythmia, especially in patients suffering from cardiosclerosis, and a distinct improvement of the polycardiographic indices after defibrillation point to the need of attempting, whenever this is possible, to bar the auricular fibrillation. A pretreatment with potassium preparations and lengthy maintenance therapy with quinidine or quinidine-like agents is recommended. An analysis of the ECG findings after the electric stimulation therapy (heart rate, and its regularity, the state of the intraatrial and atrioventricular conduction) enable it to foresee the retention time of the re-established rhythm.