positive e nitrogen balance 正氮平衡
However, this can BC reversed by early BCAA-rich total parenteral nutrition with early attainment of positive nitrogen balance.
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。
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