术后血支链氨基酸浓度明显下降，支链氨基酸浓度较高的全静脉营养可扭转这种现象并使正氮平衡提前出现。
However, this can BC reversed by early BCAA-rich total parenteral nutrition with early attainment of positive nitrogen balance.
NS组手术后体重、血清蛋白回升较NT组明显提前，由负氮平衡向正氮平衡恢复所需时间较NT组明显缩短。
The recovery of body weight, level of plasma albumen and nitrogen balance in NS group was faster than that of NT group.
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