The aorta is the main artery in the heart. It carries oxygen-rich blood from the heart to the body. Aortic coarctation is the narrowing of the aorta. This slows or blocks blood flow. It is often associated with other heart and vascular conditions. Examples include abnormal heart valves or aneurysms, which can lead to further health problems.

Anatomy of the Heart
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Aortic coarctation is a congenital heart defect. This means that it is present at birth. It occurs because of a problem with the way the aorta develops while the fetus is growing in the womb.