We followed up thirty-three patients, to whom the superior vena cava-pulmonary artery anastomosis (Glenn procedure) was undergone between April 1966 and March 1988. There were eighteen patients with single ventricle and nine with tricuspid atresia, two with pulmonary atresia with intact ventricular septum and four with other complex anomalies. Seven patients (21%), including six with single ventricle, died 0.3 to 14.9 years after operation. Regurgitation of common atrioventricular valve was the cause of death in three patients. Serum hemoglobin level fell down from 19.3 +/- 2.2 g/dl preoperatively to 15.3 +/- 1.9 g/dl after operation but increased gradually to the preoperative level about ten years later. The actuarial survival rate at ten years is 80%. Reoperation was performed in 9 patients and reoperation free rate at 10 years is 78%. This analysis suggests that Glenn procedure is still good palliative operation for ten years, although some patients will be necessitated the second operation in future.