fig19

Figure 19. 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). Continuous wave Doppler interrogation of the PDA in (B) depicts high velocity (~4 m/s) indicating that the pressure in the pulmonary artery is likely to be low (see the text). Aorta (Ao), diastolic (D), descending aorta (DAo), pulmonary artery (PA), right ventricle (RV), and systolic (S) are labeled. Reproduced from Ref.^[20].