If I had a melaena.
D001803:Blood Transfusion; D004724:Endoscopy; D006801:Humans; D006993:Hypnotics and Sedatives / Q000627:therapeutic use; D008551:Melena / Q000209:etiology / Q000601:surgery / Q000628:therapy; D008722:Methods
D006993:Hypnotics and Sedatives