上消化道大出血是多种原因所致的常见临床急症,病因以食管静脉曲张出血(BEV)、消化性溃疡(PU)、急性胃粘膜炎等为多.大多数经保守治疗可顺利恢复,病死率约8～10%.近年发现,急性上消化道出血有自限性,PU所致者约4/5的病例可自行停止;死亡病例80%在入院48h后.因此,及时发现活动性出血(AH,包括继续出血和再出血)是降低病死率的关键,确切地计算失血量是确定治疗方案和减少治疗性干扰的依据 Upper gastrointestinal bleeding is a common clinical emergency caused by a variety of reasons, the cause of esophageal variceal bleeding (BEV), peptic ulcer (PU), acute gastric mucositis, etc. Most of the conservative treatment can be successfully recovered, died of Rate of about 8 ~ 10% .In recent years, found that acute upper gastrointestinal bleeding has self-limiting, PU caused by about 4/5 cases can stop on their own; 80% of deaths after admission 48h.Therefore, timely detection of active bleeding (AH, including continued bleeding and rebleeding) is the key to reduce the mortality rate, the exact calculation of blood loss is to determine the treatment options and reduce the therapeutic interference