fig4

Figure 4. Echo-Doppler studies demonstrating the site of the sample volumes in the pulmonary artery (PA) (A) and the aorta (Ao) (B) in parasternal short-axis and apical five-chamber views, respectively; note that the bottom panels display pulsed Doppler recordings. Normal values are typically about 1.0 m/s. Reproduced from Ref.^[19].