Monocusp valve in right ventricular outflow tract.

Sixty patients aged 5 days-10.3 years (mean 2.9 years) received monocusp valve implants in the right ventricular outflow tract in corrective surgery for congenital heart disease. The free edge of the monocusp valve was attached to the posterior wall of the new pulmonary tract to cover the entire root of the pulmonary tract when the monocusp valve closed. Follow-up was 3.8 (0-11.5) years. Early mortality was 8.3% (5/60) and late mortality 3.6% (2/55). Monocusp valve regurgitation developed in all patients. Moderate or severe valve failure was found in 30 patients at median 1.4, mean 2.2 (0.2-6.8) years postoperatively. Repeat surgery was performed in seven cases because of monocusp failure. It is emphasized that monocusps potentially give short-term reduction of pulmonary regurgitation when used for right ventricular outflow tract reconstruction. Only long-term follow-up can disclose whether all patients with a monocusp valve will require repeat surgery.