Narrowing and insufficiency of an aortic valve, illustration
Illustration showing stenosis (narrowing) and insufficiency of an aortic valve caused by rheumatic fever. Here all commissures are merged together. This prevents the outflow of blood from the ventricle into the aorta. The aortic valve also cannot stop the backflow of blood from the aorta into the ventricle., Photo by MEDICAL GRAPHICS/MICHAEL HOFFMANN/SCIENCE PHOTO LIBRARY
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