Clinical features and treatment for coronary sinus orifice atresia.

Results CSOA was preoperatively diagnosed in 2 of 6 patients by late phase coronary angiography findings, intraoperatively in 3, and postoperatively in 1. Coronary venous drainage was through the left superior vena cava (LSVC) to innominate vein in 3, through Thevesian veins to right atrium in 2, and both in 1. 3 patients needed surgical treatment without any mortalities. The first patient with ccTGA had undergone the redirection of LSVC to functional left atrium at the timing of double switch operation, because postoperative transient high right SVC pressure would deteriorate coronary venous drainage, and also the presence of LSVC obstructed to create right ventricle to pulmonary artery conduit. Second patient with TA gradually developed hypoxia after the Fontan operation, which was revealed to be caused by the increase of veno-venous shunt blood flow from innominate vein to right atrium through LSVC to Thevesian veins, so that LSVC was ligated and coronary sinus was unroofed. The remaining functional single ventricle patient had undergone ligation of LSVC and unroofing coronary sinus at Fontan operation, to prevent coronary venous drainage failure.