fig63

Figure 63. Echo-Doppler studies in parasternal short-axis views demonstrating the results of transcatheter buttoned device closure of patent ductus arteriosus (PDA). Panel (A) secured prior to PDA occlusion clearly demonstrates PDA (arrow in A). Panel (B) recorded following PDA closure shows no evidence for residual shunt. Note laminar (blue) flow in the main (MPA), left (LPA) and right (RPA) pulmonary arteries (B) in the study secured following PDA closure. These data clearly indicate that there is no obstruction in the LPA. Aorta (Ao) is labeled. Reproduced from Ref.^[41].