fig57

Figure 57. Echocardiographic study in parasternal short-axis projections featuring a small patent ductus arteriosus (PDA) (arrow in A) with a shunt from the descending aorta (DAo) to the pulmonary artery (PA). High Doppler flow velocity through the PDA by continuous wave Doppler sampling (B) indicates a low PA pressure. The Doppler flow velocity in diastole (Diast) (arrow) of 2.9 m/s may be utilized to compute the PA diastolic pressure (see the text in Part I for additional discussion). Reproduced from Ref.^[36]. Ao: Aorta; P: peak velocity.