Late survival and symptoms after repair of tetralogy of Fallot.

The long-term results of 414 patients who underwent repair of tetralogy of Fallot between 1967 and 1977 were studied and correlated with the results of others. There were nine late deaths (8-year actuarial survival 95.8%). Six of the deaths wee directly related to the malformation or its treatment. Eight patients (2.4%) required reoperation. Ten patients (4.8%) had arrhythmic symptoms. Eight (3.1%) had congestive heart failure that required treatment. The risk factors associated with late events of all types, including death, were: older age at repair, a high mean ratio of peak systolic right-to-left ventricular pressures (PLV/RV) immediately after repair, and the presence of a Potts anastomosis. Neither a transannular patch nor a previous Blalock-Taussig or Waterson anastomosis was an incremental risk factor. Bacterial endocarditis was not observed. Three hundred seven patients underwent repair primarily or after a single Blalock-Taussig or Waterston shunt and had a PRV/LV of 0.85 or less after repair. Among these selected patients, the actuarial survival was 98.1%, which is still lower than that for the general population (p = 0.12), and freedom from events was 95.9%. Late after repair, PRV/LV was lower by 6 +/- 28% (+/- SD) than PRV/LV immediately after repair (p = 0.03) in the 33 restudied patients with such data. The higher the PRV/LV immediately after repair, the greater the percent reduction.