[Practice of emergency nursing: hematemesis and melena].
D004630:Emergencies; D006471:Gastrointestinal Hemorrhage / Q000150:complications / Q000451:nursing*; D006396:Hematemesis / Q000209:etiology / Q000451:nursing*; D006801:Humans; D008551:Melena / Q000209:etiology / Q000451:nursing*