How are anomalous pulmonary venous return & transposition of great vessels different?

Both cause cyanosis: Both are congenital heart defects that cause cyanosis (less oxygen than normal in the arterial blood.) however that is the only similarity. In transposition of the great arteries, the primary problem is that the aorta arises from the right ventricle instead of the left ventricle. In t(total)apvr, the primary problem is that the pulmonary veins do not connect directly with the left atrium.