Right ventricular thrombosis in two patients with pulmonary atresia with intact ventricular septum.

Thrombosis was detected in the right ventricle 7 days after a bidirectional Glenn operation in a 1-year-old boy with pulmonary atresia with intact ventricular septum (PAIVS) and immediately before pulmonary valvuloplasty in a 21-day-old boy with PAIVS. The risk of thrombosis and the blood clotting cascade should be assessed by blood tests, and surveillance echocardiography should be frequently applied in order to diagnose thrombosis early in such patients.