Postoperative arrhythmias in open-heart surgery, A study on fifty cases.

50 consecutive patients undergone open heart surgery were analyzed regarding postoperative arrhythmias in the first postoperative 3 days. Disturbances of rhythm occurred in each case of our group, serious or not serious (100%). Ventricular premature beats were the most frequent type of arrhythmia in the first and second postoperative days (80%). Two cases expired postoperatively. In one of them complete atrioventricular block developed after double valvular replacements (mitral and tricuspid). The other died of low cardiac output syndrome. Etiology of the arrhythmias after open heart surgery is not clear in the absence of electrolyte and metabolic disturbances, digitalis intoxication and surgical trauma to the conduction system and coronary arteries. Low cardiac output syndrome, hypotension and hypoxia can also be blamed in the formation of these arrhythmias. Other factors such as the prolongation of anoxic arrest, irritation of the ventricular septum by valvular prostheses, cardiac irritation by thoracic tubes, psychologic trauma, halothane anesthesia and coronary arterial disease in the old age group may be the possible predisposing factors in these patients.