[Total anomalous pulmonary venous connection. Results of repair in 50 infants].

Fifty infants with isolated total anomalous pulmonary venous connection (TAPVC) were operated between 1/01/73 and 31/12/87. The average weight at surgery, which was performed under hypothermia with circulatory arrest in 92 per cent of cases, was 4.5 Kg. The preoperative pulmonary to systemic pressure ratios (PAP/PS) enabled identification of two groups of patients: Group I: TAPVC without severe pulmonary hypertension (PAP/PS less than 0.85) (n = 35), and Group II: TAPVC with severe pulmonary hypertension (PAP/PS greater than 0.55) (n = 15). The hospital mortality was 22 per cent (8 cases) in Group I compared with 73 per cent (11 cases) in Group II (p less than 0.05). Patients in Group II were younger (64 days compared with 137 days, p less than 0.02), lighter (p less than 0.05) and had preoperative mean pulmonary artery systolic pressures of 83 mmHg (p greater than 0.001). Three patients in Group I required early reoperation for stenosis of the pulmonary veins at the site of repair resulting in pulmonary hypertension, and all died. The global survival was 28 patients with an average follow-up of 7 years (range 1 to 15 years). Six of these patients were reoperated (2 phrenoplications, 4 atrial shunts). All survivors are asymptomatic and have no conduction defects. Control echocardiography in 15 of the 28 survivors was judged to be normal. These results show that obstructive forms of TAPVC (Group II) carry a very poor prognosis: immediate results in this group could only be improved by earlier surgery. The clinical long-term results in those who survive surgery are very satisfactory.