English: What is coarctation of the aorta? An aortic coarctation is a narrowing of the aorta, which is split into infant and adult forms. In the infant form, it's often accompanied by patent ductus arteriosus, and mixing of deoxygenated and oxygenated blood, whereas in the adult form, the ductus arteriosus has closed off. This video covers the pathphysiology for both forms, as well as important complications and treatment options.