The negative nitrogen balance of control group was more seriously than PN group(P<0.05).
术后PN支持组的负氮平衡改善较常规补液组明显（P＜0.05）。
2
Time of resumption of gastrointestinal function in EN group was earlier that in PN group (P <0.01);
胃肠道功能恢复时间肠内营养组明显早于肠外营养组（P<0.01）；
3
Catheter time of infection, parenteral nutrition(PN) rate, tracheotomy rate, hospital stay and costs were higher(P<0.05), albumin level lower than that of the control group(P<0.05);