实习医师报告病历：患儿男，年龄1岁2个月。以反复间歇性呕血与黑便2个月余于1996年7月7日入院。2个月前无明显诱因出现呕血，量不多，呕吐物为咖啡样液体。有时呕奶水与奶瓣。数日后出愈柏油样便，每日2～3次，量不定，多则浸湿3～4决尿布，少则浸湿1～2块尿布。便中无粘液与 Interns report medical records: children male, age 1 year and 2 months. To repeated intermittent hematemesis and melena more than 2 months in July 7, 1996 admission. 2 months ago no obvious incentive to hematemesis, small amount of vomit for the coffee-like liquid. Sometimes vomit milk and milk petals. A few days later, asparagus-like stool, 2 to 3 times a day, the amount of uncertainty, as much wet 3 to 4 diapers, wet as little as 1 or 2 diapers. No mucus and no urine