晚发性维生素 K缺乏症又称婴儿维生素 K缺乏症 ,亦称获得性凝血酶原减低症。常早期引起颅内出血 ,病情凶猛 ,病死率高 ,存活者多有明显后遗症。我院自 1993～ 1999年收治 40例晚发性维生素 K缺乏患儿 ,报道如下。1　临床资料1.1　一般资料　在 40例患儿中 ,男 2 8例 ,女 12例。 Late onset vitamin K deficiency, also known as vitamin K deficiency in infants, also known as acquired prothrombin reduction. Often caused by intracranial hemorrhage early, fierce condition, high mortality, survivors have obvious sequelae. 40 cases of late onset vitamin K deficiency admitted to our hospital from 1993 to 1999 were reported as follows. 1 Clinical data 1.1 General information in 40 cases of children, 28 males and 12 females.