肠外营养(parenteral nutrition PN)是指多种原因引起的病人不能或不适宜从胃肠道摄食及高分解代谢状况下,通过肠外途径即静脉供应大部营养素的静脉营养疗法,来维持代谢和各器官的正常功能,促使其蛋白质在体内高效率的合成以减少机体的自身消耗,改善病人的营养不良状态,促进创伤愈合,减少并发症,增加机体免疫功能及抗感染能力,达到治疗的目的,从而降低病死率,提高存活率。 Parenteral nutrition PN refers to the maintenance of metabolism by a variety of causes that cause patients not to be able or unfit for their parenteral route of intravenous nutrient delivery of most nutrients, either from the gastrointestinal tract or under high catabolic conditions And the normal function of various organs to promote the efficient synthesis of its protein in the body to reduce the body’s own consumption, improve the patient’s malnutrition, promote wound healing, reduce complications, increase immune function and anti-infective ability to achieve the treatment The purpose, thereby reducing mortality, improve survival.