This paper provides an introductory overview of coarctation of the aorta, a congenital defect characterized by a narrowing of the body's main artery. It explains the condition's anatomical basis, its association with related disorders such as Turner's syndrome and bicuspid aortic valve, and the resulting blood pressure imbalances between the upper and lower body. The paper also covers prevalence, symptom range from infancy through adulthood, diagnostic tools including echocardiography and MRI, and the three main surgical approaches used to correct the defect, noting how patient age, size, and cardiac stability influence surgical outcomes and risk.
Coarctation of the aorta is a congenital birth defect in which the aorta — the major artery carrying blood away from the heart — has a narrowed point somewhere along its length. Most commonly, this narrowing occurs just past the junction where the subclavian artery meets the aorta. The condition is sometimes called aortic coarctation, but both terms refer to the same defect. The word coarctation itself means narrowing, and so the name is directly descriptive of the anatomical abnormality.
Because the aorta supplies blood and nutrients to many branching arteries throughout the body, any narrowing has significant hemodynamic consequences. Arteries that branch off after the narrowed point tend to experience lower blood pressure and reduced blood flow, while arteries closer to the heart experience elevated pressure. As a result, coarctation of the aorta commonly produces high blood pressure in the upper body and low blood pressure in the lower body.
The condition is also associated with certain genetic disorders, most notably Turner's syndrome. There is additionally a recognized association between coarctation and aortic valve abnormalities, particularly a bicuspid aortic valve (health.yahoo.com, 2004).
Approximately one in every 10,000 people has coarctation of the aorta. It is most often identified and diagnosed in children or in adults under 40 years of age. There is currently no known way to prevent the defect; however, awareness of its risk factors can lead to earlier diagnosis and more timely treatment.
The symptoms associated with coarctation of the aorta depend largely on how severely blood flow is restricted. Very severe cases are typically detected during infancy, while mild cases may go unnoticed until adolescence or later. In some cases, there are no symptoms at all.
Common symptoms include decreased exercise performance, cold legs or feet, and shortness of breath — though these can also indicate other disorders. Additional symptoms that may be present include hypertension with exercise, nosebleeds, leg cramps during exercise, a pounding headache, fainting or dizziness, and nodding head movements that occur in rhythm with the heartbeat.
In infants, signs of left-sided heart failure or aortic regurgitation may also be observed. A stethoscope will often detect a harsh cardiac murmur, and a comparison of pulses will typically reveal a weaker or absent groin pulse relative to the carotid pulse in the neck.
"Clinical signs and diagnostic imaging methods"
"Surgical options, patient factors, and mortality risk"
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