Recurrent ventricular fibrillation associated with normal QT intervals.

Two patients after being treated for epilepsy for 20 years were found to have recurrent syncope due to ventricular fibrillation. Neither had structural heart disease. The first patient had normal QT and QTc values at all times, and the second had a normal QT interval and an intermittently abnormal U wave. In both patients, attacks were suppressed totally by propranolol. These cases, and some similar patients reported previously suggest that there may be a forme fruste of the long QT syndrome.