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| Aortic Valve Insufficiency Aortic Incompetence | Aortic Regurgitation | Aortic Valve Incompetence | Regurgitation, Aortic Valve | Incompetence, Aortic | Incompetence, Aortic Valve | Insufficiency, Aortic Valve | Regurgitation, Aortic Backflow of blood from the aorta into the left ventricle, owing to imperfect functioning of the aortic semilunar valve. |