Postoperative supraventricular arrhythmias and the role of prophylactic digoxin in cardiac surgery

A prospective study of 182 patients undergoing cardiac surgery was performed. The patients were divided into three groups. Group I consisted of 83 patients who had never been treated with digitalis. Group II comprised 59 patients who were taking digoxin before operation and had medication discontinued 24 to 48 hours prior to surgery; they did not receive maintenance digoxin in the postoperative periods. Group III was made up of 40 patients who were given prophylactic digoxin in the perioperative period; none had taken digoxin before. Sixty of 83 group I patients (72%) and two of the group III patients (5%) developed postoperative supraventricular tachyarrhythmia. Digoxin was reinstituted in 56 of group II patients (95%) for supraventricular arrhythmia and/or heart fallure. Of the various factors evaluated, only valvular surgery and ECG evidence of myocardial infarction were associated with postoperative supraventricular tachyarrhythmias.