患儿,男,4岁,因便血2天人院。患儿因流涕家长给服感冒通2片,约5个小时后出现便血,大便糊状,呈暗红色,共4次,每次量约400克;区吐1次,为食物,无血块;伴头晕,剑突下隐痛,无血尿。既往无腹痛史。查体:T37℃,P160次/分,R20次/分,BP14/10Kpa,面色苍白,心肺无异常,腹软,剑突下轻压痛。实验室检查:大便隐血试验(+++),血红蛋白48g/L,红细胞1.69×10~(12)/L,红细胞压积13.7％,血 Children, male, 4 years old, because of hematochezia 2 days hospital. Children with runny nose due to runny nose to pass flu 2, about 5 hours after the emergence of hematochezia, stool paste, dark red, a total of 4 times, each about 400 grams; vomiting 1 times for the food, no blood clots ; With dizziness, hypanthium under pain, no hematuria. No history of abdominal pain. Examination: T37 ℃, P160 beats / min, R20 beats / min, BP14 / 10Kpa, pale, no abnormal heart and lung, abdominal soft, xiphoid tenderness. Laboratory tests: fecal occult blood test (+++), hemoglobin 48g / L, erythrocyte 1.69 × 10-12 / L, hematocrit 13.7%, blood