消化道出血的临床症状是单纯的,但其病因却是多种的,共同点是发生快,一定有血管病变,且较严重,炎症反应不明显。有时可发现胃粘膜弥漫性紫癜,无肉眼可见的溃疡。但如大量和反复出血时,通常可发现一个或几个边缘清楚的溃疡,易侵蚀小动脉或易穿孔。内科疾病并发消化道出血时,溃疡的位置较多见于十二指肠,外科手术后并发出血时,溃疡的位置多见于胃部。慢性呼吸衰竭过程中消化道出血慢性呼吸衰竭特别多见于患慢性阻塞性支气管疾患的老年男性病人。出血主要发生在支气管继发感染后需要进行呼吸救护的病人。支气管继发感 The clinical symptoms of gastrointestinal bleeding is simple, but its causes are varied, the common occurrence is fast, there must be vascular disease, and more serious, the inflammatory response is not obvious. Sometimes gastric mucosal diffuse purpura can be found, no visible ulcer. However, such as massive and repeated bleeding, usually found one or more clear edge of the ulcer, easy to corrode arterioles or perforation. Internal diseases with gastrointestinal bleeding, the ulcer is more common in the duodenum, bleeding after surgery, bleeding, ulcer more common in the stomach. Chronic respiratory failure is particularly common in elderly male patients with chronic obstructive bronchial disease. Bleeding occurs primarily in patients who require resuscitation after a secondary bronchial infection. Bronchial secondary flu