[Cardiac pacing therapy of late intermittent AV block after surgery for tetralogy of Fallot]

Postoperative atrioventricular block may be the cause of early or late death unless diagnosed and treated in time. The authors describe the development of late intermittent complete intraventricular block in an 11-year-old girl with syncope nine years after radical correction of the tetralogy of Fallot. Incomplete trifascicular block was diagnosed by electrophysiological examination of the conduction system four years before the development of complete trifascicular block. With regard to the serious character of an intermittent block cardiac pacing therapy was used.