fig49

Figure 49. Selected video frames from parasternal short-axis 2D and color flow recording (A) showing a patent ductus arteriosus (PDA) shunting left-to-right. A high Doppler flow velocity (B) via the PDA (≈ 4 m/s) suggests that the PDA is small and the pressure in the pulmonary artery is low. Aorta (Ao), diastolic (D), descending aorta (DAo), right ventricle (RV), and systolic (S) are labeled. Reproduced from Ref.^[16].