Complete transposition of the great arteries is a congenital heart defect with atrioventricular concordance and ventriculoarterial discordance in which the aorta arises from the morphologic right ventricle and the pulmonary artery arises from the morphologic left ventricle, resulting in severe cyanosis. Transposition of the great arteries (TGA) is frequently associated with other cardiac malformations such as ventricular septal defect. TGA is divided into three groups. Group I is TGA with intact ventricular septum. Group II is TGA with ventricular septal defect (TGA/VSD). Group III is TGA/VSD with pulmonary stenosis.
