年幼小儿出血性疾病,根据出血机理,可有血小板性、血浆性及血管性的区别。血小板方面有数量的减少和功能的减弱;血浆方面可有凝血因子的缺陷和抗凝性物质的增加;血管方面则有毛细血管脆性或通透性增强等改变。从出血进展情况来看则有暴发性、急性和慢性 Young children with bleeding disorders, according to the bleeding mechanism, may have platelet, plasma and vascular differences. Platelets in terms of the number of reduced and decreased function; plasma can have coagulation factor defects and anticoagulant substances increased; blood vessels there are capillary fragility or increased permeability and other changes. From the progress of bleeding is bursting, acute and chronic