fig59

Figure 59. Echocardiographic study in parasternal short-axis projections (similar to [Figures 57 and 58], but from a different premature infant) featuring a large patent ductus arteriosus (PDA) (arrow in A) with a shunt from the descending aorta (DAo) to the pulmonary artery (PA). Doppler flow velocity through the PDA by pulsed wave Doppler sampling (B) was low (< 0.5 m/s) with laminar flow, indicating a high (near-systemic) PA pressure. Aorta (Ao), peak velocity (P), and right ventricle (RV) are marked. Reproduced from Ref.^[36].