Amsacrine treatment of patients with supraventricular arrhythmias and acute leukemia.

Three patients with a history of supraventricular arrhythmia presented with relapse of acute leukemia. Two of the three patients were in sinus rhythm, receiving digoxin and/or verapamil daily. The third patient was in atrial fibrillation, but her heart rate was controlled with daily digoxin. All three patients received amsacrine without the occurrence of cardiac events. Although amsacrine may cause ventricular arrhythmias in the setting of hypokalemia, correction of the electrolyte abnormality permits its use in patients with a history of supraventricular arrhythmias.