筋肉のNa+K+ATPアゼ活性とセプティックショックにおける乳酸濃度の上昇との関連:前向きな研究
Bruno Levy1, Sébastien Gibot, Patricia Franck
1Service de Réanimation Médicale, Hôpital Central, 54035 Nancy, France. b.levy@chu-nancy.fr
Lancet (London, England)
|March 9, 2005
まとめ
セプティックショックでは,骨格筋は,単に低酸素からではなく,Na + K + ATPase刺激を通じてエアロビック的に乳酸を産生します. この酵素を阻害すると,筋肉の乳酸が減少し,乳酸が酸素欠乏の指標ではなく,疾患マーカーであることを示唆しています.
科学分野:
- バイオケミストリー バイオケミストリー
- 生理学 生理学とは
- クリティカルケア・メディシン
背景:
- セプティックショックにおける高乳糖血症は,しばしば組織低酸素と誤って関連付けられる.
- この状態は,一貫して perfusion インディケータと関連付けられず,酸素の供給の増加によって改善されるわけではありません.
- 骨格筋は,Na + K + ATPaseの活動に関連して,有酸素的に乳酸を生成することができます.
研究 の 目的:
- Na+K+ATPアゼを阻害することで,セプティックショック患者における筋肉の乳酸酸の産生を減少させることができるかどうかを調査する.
主な方法:
- 14人のセプティックショック患者では,マイクロダイアライシスプローブを四頭筋に挿入した.
- 探査機にはオアバイン (Na+K+ ATPase inhibitor) またはリンガー溶液を注入した.
- 乳酸塩とピルバ酸塩の濃度は,透析液と動脈血で測定されました.
主要な成果:
- 患者は血中乳糖値が上昇した (平均4.0mmol/L).
- 筋肉の乳酸塩とピルバートは,動脈のレベルより有意に高かった.
- オアバインの注入は,筋肉の乳酸塩およびピル酸塩の産生を効果的に停止させた (p=0.0001).
結論:
- Na+K+ ATPaseによって刺激される骨格筋は,エアロビック・グリコリシスによるセプティック・ショックにおける重要な乳酸源である.
- セプティックショックにおける乳酸塩濃度は,必ずしも酸素欠乏ではなく,疾患の重度と悪い結果を示す.
- 乳酸は代謝信号と見なされるべきであり,そのクリアランスは貴重な蘇生エンドポイントである可能性があります.
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