Severe conduction disturbances and ventricular arrhythmias complicating mediastinal irradiation for Hodgkin's disease: a case report.

A 27-year-old male had undergone mediastinal and retroperitoneal irradiation for stage IIIA Hodgkin's disease at age 19. When he was admitted to the hospital, because of lightheadedness and syncope, trifascicular bundle branch block was noted and the patient underwent a clinical electrophysiological investigation. AH and HV intervals were prolonged and ventricular fibrillation was induced during programmed right ventricular stimulation. Serial electrophysiological studies allowed us to prescribe effective antiarrhythmic drug therapy with no recurrence of symptoms during a follow-up period of 12 months.