Hartzler GO, Maoloney JD. Mayo Clin Proc 52(9):576-81, 1977. In a patient with Wolff-Parkinson-White syndrome, protracted, disabling tachycardia occurred because of low left lateral accessory pathway refractoriness and rapid retrograde conduction, most likely by a septal pathway. Conventional medications, including intravenously administered lidocaine and procainamide, were ineffective in terminating the tachycardia. Transesophageal atrial pacing easily terminated the recurrent supraventricular tachycardia.