fig18

Figure 18. Selected video frames from parasternal short-axis 2D and color Doppler study displaying a patent ductus arteriosus (PDA) with left-to-right shunt in (A). Pulse Doppler interrogation of the PDA in (B) depicts low velocity (1.0-1.4 m/s) indicating that the pressure in the pulmonary artery is likely to be high (see the text). Aorta (Ao), descending aorta (DAo), pulmonary artery (PA), and right ventricle (RV) are labeled. Reproduced from Ref.^[20].