Torsade de pointer is often associated with syncope, particularly when prolonged. We report a cane of prolonged asymptomatic torsade de pointes in a 68‐year‐old woman being treated with quinidine gluconate for paroxysmal atrial fibrillation. Ambulatory monitoring obtained one week after an increase in the daily qninidine dosage demonstrated one minute of polymorphous ventricular tachycardia. The patient remained entirely asymptomatic throughout the time of the arrhythmia. Therefore, a lack of symptoms in patients at risk for torsade de pointes may not exclude the presence of this arrhyth