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）。

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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）。

youdao