Intracardiac repair of tetralogy of fallot

One-hundred and twenty-two patients underwent intracardiac repair for tetralogy of Fallot between the ages of four and twenty-one. Isolated infundibular stenosis was seen in 63.6 per cent combined infundibular and valvular stenosis in 17.3 per cent, diffuse hypoplasia of outflow tract and main pulmonary artery in 10 per cent and isolated valvular stenosis in 9 per cent. Narrowing of right pulmonary artery was seen in two patients. Outflow patch was necessary in seventy-seven. Nineteen patients died. The causative factors were transannular patch for diffuse hypoplasia, infection and inadequate repair. Residual right ventricular hypertension was an important cause for mortality and morbidity. Myocardial blood flow was also found reduced, especially when residual right ventricular pressure was high.