Heart failure
Due to the incomplete closure of ventricular septum leading to Left-Right shunt . Often involved the membranous region . This is the last part where endocardial cushion and interventricular muscle ridge fuse together to form the septum . Persistent opening of the ductus arteriosus after 3 months of life . Ductus arteriosus should be obliterated to form ligamentum arteriosum within 3 months of ... ................
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