We assessed their ductus arteriosus and foramen ovale on the basis of the past several studies. We reviewed the echocardiograms of the fetuses prenatally diagnosed as TGA and managed at our institution between January 2012 and December 2018, retrospectively. We aimed to identify the prenatal echocardiographic features that may predict the need for urgent BAS. In such cases, immediate balloon atrial septostomy (BAS) is needed in order to improve mixing of the pulmonary and systemic circulation. However, some neonates, especially who have intact ventricular septum or small ventricular septal defect (VSD), show severe hypoxemia soon after birth and even die in preoperative period. Prenatal diagnosis of transposition of the great arteries (TGA) has been progressing, and the surgical outcome from the arterial switch operation is usually successful. National Cerebral and Cardiovascular Center, Pediatric Cardiology, Osaka-Japan 2 National Cerebral and Cardiovascular Center, Perinatology, Osaka-Japan 1 Obstetrics - Fetal echocardiography and Congenital Heart Diseases E1060 - PRENATAL ECHOCARDIOGRAPHIC FINDINGS IN FETUSES WITH TRANSPOSITION OF THE GREAT ARTERIES TO PREDICT THE NEED FOR BALLOON ATRIAL SEPTOSTOMY
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