Supravalvular aortic stenosis is a heart issue that develops prior to birth. This problem is a constricting of the large capillary that carries blood from the heart to the remainder of the body. Some people with SVAS also have defects in other blood vessels, most frequently stenosis of the artery from the heart to the lungs. An abnormal heart audio during a heart beat can usually be listened to throughout upper body test.
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