患儿男,60天,足月顺产,母乳喂养,无外伤史家族中无出血性疾患。因腹泻40余天,大便6～7次/日,蛋花汤状,血性大便一次,4天前有血性鼻涕。入院前一日呕吐5～6次,拒奶,抽痉4～5次,不发热,抽痉时自行划破鼻根皮肤而渗血不止。查体:体温37.3℃,体重4公斤。发育营养中等,嗜睡,面色苍白,口周紫钳,鼻根皮肤破损处渗血不止。前囟隆 Children male, 60 days, term full-term, breast-feeding, no history of bleeding without bleeding disorders in the family history. Due to more than 40 days of diarrhea, stool 6 to 7 times / day, egg-shaped soup, bloody stool time, 4 days before bloody nose. Vomiting the day before admission 5 to 6 times, refuse to milk, spasm 4 to 5 times, no fever, spasm spasm scratch the nasal root skin and bleeding more than. Physical examination: body temperature 37.3 ℃, weight 4 kg. Development of moderate nutrition, drowsiness, pale, mouth circumference clamp, nose root skin damage bleeding more than. Before the fontanelle