title: The two anoxias.
mesh_terms: D000766:Anesthesia, Dental / Q000009:adverse effects*; D001775:Blood Circulation / Q000187:drug effects; D001921:Brain / Q000098:blood supply; D006801:Humans; D000860:Hypoxia / Q000139:chemically induced; D013575:Syncope / Q000209:etiology*