ABSTRACT
Transposition of the great arteries with intact ventricular septum (TGA IVS) is a cyanotic congenital heart disease with high neonatal mortality without early diagnosis. But TGA IVS is known to have good prognosis if treated by arterial switch operation (ASO) within 2 weeks after birth with early diagnosis. We diagnosed two cases of TGA IVS prenatally by fetal echocardiography. A case was diagnosed at 26th weeks of gestation, and the mother was transferred to a cardiac center for planned delivery. The baby had received ASO on postpartum 7th day, but he died of right ventricular failure on postoperative 8th day. The second case was diagnosed at 37th gestational weeks and was transferred to Asan medical center immediately after birth. And he is doing well without any treatment after ASO.