本文对36例晚发性维生素K缺乏症的临床和实验室资料进行了描述和分析。其中28例有颅内出血,12例进行了脑CT检查,均显示出血病灶。本组用维生素K_1、输新鲜血、激素与脱水剂等综合治疗,死亡2例。我们认为对于单纯用母乳喂养或有肝炎、长期腹泻和服抗生素的小婴儿应该用维生素K_1预防此症。 This article describes and analyzes the clinical and laboratory data of 36 patients with late onset vitamin K deficiency. Among them, 28 cases had intracranial hemorrhage and 12 cases had brain CT examination, all showing hemorrhagic lesions. This group of vitamin K_1, lose new blood, hormones and dehydration agent and other comprehensive treatment, 2 patients died. We think that for young infants who are breast-fed or have hepatitis, long-term diarrhea and antibiotics, we think vitamin K-1 should be used to prevent this condition.