高齢敗血症患者における予後栄養指数と28日死亡率:MIMICデータベースに基づく後ろ向き分析
Yuewen Yang1, Zhihong Zhou1, Huajie Dai2
1Department of Intensive Care, Shunde Hospital, Guangzhou University of Chinese Medicine, Foshan, China.
Northern clinics of Istanbul
|January 23, 2026
まとめ
極端な予後栄養指数(PNI)値は、高齢敗血症患者における28日死亡率の上昇と関連している。本研究はPNIと死亡リスクの非線形関係を明らかにし、PNIが敗血症の転帰予測に役立つ可能性を示唆している。
科学分野:
- 老年医学; 集中治療医学; 栄養科学
背景:
- 末梢血リンパ球数と血清アルブミンは、敗血症における既知の死亡予測因子である。
- 以前の研究は個々の指標に焦点を当て、それらの複合的な予後価値を見過ごしていた。
- 予後栄養指数(PNI)は、包括的な栄養評価のためにアルブミンとリンパ球を統合する。
研究 の 目的:
- 高齢敗血症患者における予後栄養指数(PNI)と28日全死因死亡率との関連を調査すること。
- PNIと死亡リスクの非線形関係を探求すること。
- 敗血症の予後リスク層別化におけるPNIの有用性を評価すること。
主な方法:
- MIMIC-IVデータベース(2008-2019年)から2,121人の高齢敗血症患者の後ろ向き分析を実施。
- 28日転帰に基づいた生存群と死亡群への分類。
- PNIが死亡率に与える影響を評価するために、制限立方スプライン(RCS)分析、カプランマイヤー曲線、およびCox比例ハザードモデルを使用した。
主要な成果:
- PNI値は生存群と比較して非生存群で有意に低かった。; PNIと28日死亡リスクの間には非線形関係が観察された。; 極端なPNI値(低値または高値)は、28日全死因死亡率の増加と独立して関連していた(HR=1.349、p=0.004)。
結論:
- 本研究は、高齢敗血症患者におけるPNIと28日死亡率との非線形関連を実証する。
- 極端なPNI値は、死亡率の独立した危険因子として特定された。
- PNIは、敗血症における予後リスク層別化のための効果的なツールとしての可能性を示す。
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