LEFT-VENTRICULAR TRANSVENOUS ELECTRODE DISLODGMENT AFTER MUSTARD REPAIR FOR TRANSPOSITION OF THE GREAT-ARTERIES

An 11-year-old girl who underwent Mustard's operation for complete tra nsposition of the great arteries in infancy, developed Mobitz type II second-degree AV block 8 1/2 years later. A transvenous, active fixati on left ventricular lead was inserted and connected to a rate responsi ve pacemaker. Two years later the lead dislodged due to the child's gr owth. A new active fixation electrode was positioned in the left ventr icle below the pulmonary valve, leaving an electrode loop in the ventr icle. Such an approach may prevent lead dislodgement due to growth aft er intraatrial repair for transposition of the great arteries, but reg ular radiological or echocardiographic follow-up of lead position is r ecommended in these patients.