_:vb50950082 . _:vb50950082 . _:vb50950082 . _:vb50950082 . _:vb50950082 "url:https://rarediseases.info.nih.gov/diseases/5830/aortic-valve-stenosis"^^ . _:vb50950082 . _:vb50950082 . _:vb50950082 "An aortic valve disease that is characterized by narrowing of the heart's aortic valve opening."^^ . _:vb50950082 "url:http://en.wikipedia.org/wiki/Aortic_valve_stenosis"^^ .