Complete transposition of the great arteries

Complete transposition of the great arteries means that the two great arteries are transposed in position: the aorta receives systemic venous blood from the right ventricle, while the pulmonary artery receives oxygenated pulmonary venous blood from the left ventricle, thus forming two separate circulatory systems: right atrium → right ventricle → aorta → systemic circulation → systemic veins → right atrium constitutes one circuit; left atrium → left ventricle → pulmonary artery → lungs → pulmonary veins → left atrium constitutes the other circulatory system. When the ventricular position is normal and the aortic opening is located to the right of the pulmonary artery, it is called dextro-transposition of the great arteries (D-TGA). D-TGA is the clinically common type and is often associated with atrial septal defect, ventricular septal defect, patent ductus arteriosus, pulmonary stenosis, and atrioventricular canal malformations.