"Aortic insufficiency: MedlinePlus Medical Encyclopedia" http://www.nlm.nih.gov/medlineplus/ency/article/000179.htm Aortic Insufficiency "Aortic insufficiency: MedlinePlus Medical Encyclopedia" [nlm.nih.gov] www.nlm.nih.gov/medlineplus/ency/article/000179.htm aortic insufficiency