“…Surgical enlargement of the VSD in tricuspid atresia has been performed in only a few cases without transposition of the great vessels (3, II , 14, 35 arterio-venous shunts ( 14,34,38) , absent left pulmonary artery flow if the VSD is small (40), occasionally leading to microt hrombotic vascular pulmonary disease (4), increase of pulmonary vascular resistance (20), and deterioration of gas exchange because of absent pulsatile flow (10 , 38, 55). (19,37,42,48) and dura mater valve (14 ).…”