Angiographic images of percutaneous closure of a patent ductus arteriosus

(A) Angiogram demonstrating a PDA (arrow) with left-to-right shunt from the aorta (Ao) into the main pulmonary artery (MPA).
(B) Repeat angiogram after placement of an Amplatzer ductal occluder device (outlined). There is residual flow into the device, but no residual shunt into the main pulmonary artery. Flow into the device will resolve with reversal of heparinization, and ultimately the device will be completely endothelialized.