In the developing fetus, the ductus arteriosus (DA), also called the ductus Botalli, is a blood vessel connecting the pulmonary artery to the aortic arch. It allows most of the blood from the right ventricle to bypass the fetus's fluid-filled non-functioning lungs. Upon closure at birth, it becomes the ligamentum arteriosum. There are two other fetal shunts, the ductus venosus and the foramen ovale.

In the developing fetus, the ductus arteriosus (DA), also called the ductus Botalli, is a blood vessel connecting the pulmonary artery to the aortic arch. It allows most of the blood from the right ventricle to bypass the fetus's fluid-filled non-functioning lungs. Upon closure at birth, it becomes the ligamentum arteriosum. There are two other fetal shunts, the ductus venosus and the foramen ovale.

Patent Ductus Arteriosus.  When the ductus arteriosus does not close, some oxygenated blood that should be going into circulation gets shunted back into the heart.

Patent Ductus Arteriosus. When the ductus arteriosus does not close, some oxygenated blood that should be going into circulation gets shunted back into the heart.

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Coarctation of the aorta, or aortic coarctation, is a congenital condition whereby the aorta narrows in the area where the ductus arteriosus (ligamentum arteriosum after regression) inserts.

Coarctation of the aorta, or aortic coarctation, is a congenital condition whereby the aorta narrows in the area where the ductus arteriosus (ligamentum arteriosum after regression) inserts.

Illustration of the anatomy of a heart with a patent ductus arteriosus

Illustration of the anatomy of a heart with a patent ductus arteriosus

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