Severity?: It is a congenital defect in which the valve that allows blood to pass out of the right ventricle into the pulmonary artery and lungs doesn't open properly. If mild, it causes no symptoms. If severe, it can strain the right ventricle which eventually will fail. The valve can be stretched open with a catheter (valvuloplasty) or replaced with surgery.
Answered 10/4/2014
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