18 Transposition of the Great Arteries
3. The outflow assessment reveals transposition of the great arteries (TGA) (aorta anterior and to the right of the pulmonary artery), with mild asymmetry. Aorta–to–pulmonary artery diameter ratio is 1:0.7 (Fig. 18-1).
b. Pulmonary outflow should be monitored for progressive pulmonary outflow tract obstruction as well as progressive main and branch pulmonary arteries and change in direction of ductus arteriosus flow.