title: Early investigation of haematemesis and melaena.
mesh_terms: D000368:Aged; D001466:Barium Sulfate; D002986:Clinical Trials as Topic; D004238:Diverticulitis / Q000175:diagnosis; D004381:Duodenal Ulcer / Q000175:diagnosis; D004386:Duodenum; D004932:Esophageal and Gastric Varices / Q000175:diagnosis; D006471:Gastrointestinal Hemorrhage / Q000209:etiology* / Q000401:mortality; D005773:Gastroscopy; D006396:Hematemesis / Q000175:diagnosis* / Q000209:etiology; D006548:Hernia, Diaphragmatic / Q000175:diagnosis; D006801:Humans; D008551:Melena / Q000175:diagnosis* / Q000209:etiology; D008722:Methods; D010437:Peptic Ulcer / Q000150:complications; D013274:Stomach Neoplasms / Q000175:diagnosis; D013276:Stomach Ulcer / Q000175:diagnosis; D013997:Time Factors
chemical_list: D001466:Barium Sulfate