fig51

Figure 51. A selected video frame from 2D (A) and color Doppler (B) suprasternal notch views of the aortic arch in a neonate with hypoplastic left heart syndrome. A markedly hypoplastic ascending aorta (AAo) is shown and serves only to deliver blood in a retrograde fashion to the coronary arteries. Retrograde flow (RF) in the arch of the aorta (B) suggests a ductal-dependent systemic circulation. Reproduced from Ref.^[21]. DAo: Descending aorta; LSA: left subclavian artery.