Complete atrioventricular septal defects: results of repair, risk factors, and freedom from reoperation.

Background Several perioperative risk factors influence outcomes after repair of complete atrioventricular septal defects. This study was conducted to determine their association with perioperative mortality and need for reoperation. Method and Results Between July 1982 and February 1995, 363 children underwent defect repair (median age, 8.3 months; mean, 17.4±1.3). Tetralogy of Fallot was present in 21 patients, double-outlet right ventricle in 4, subaortic stenosis in 8, ventricular hypoplasia in 8, coarctation in 5, atrial isomerism in 2, and other congenital anomalies in 9. Down's syndrome was present in 235 (65%). One-patch technique was applied in 99, two-patch in 243. During repair, the anterior bridging leaflet was divided in 12, the posterior bridging leaflet in 31, both leaflets in 71, and neither in 249. Left atrioventricular valve (LAVV) cleft was closed partially in 181 and completely in 112. Early mortality was 10.5%; 10-year survival, 83% (95% confidence interval, 0.79 to 0.87). At 10 years, freedom from reoperation for LAVV repair was 86%; LAVV replacement, 90%; subaortic stenosis, 95%; residual ventricular septal defect, 97%; permanent pacemaker insertion, 98%; and other types of reoperation, 95%. At the time of operation, greater age, shorter ischemic time, absence of a double-orifice LAVV, and cleft closure were found to be significant independent predictors of survival. Conclusions Repair of atrioventricular septal defects has acceptable early and late mortality and a low incidence of reoperation. Double-orifice LAVV remains a risk factor. Repairs that include complete cleft closure may confer better survival.