乳酸酸は,損傷またはセプシスにおける組織低酸素の不確実な指標です
J H James1, F A Luchette, F D McCarter
1Department of Surgery, University of Cincinnati Medical Center, OH, USA. jamesjh@ucmail.uc.edu
Lancet (London, England)
|August 28, 1999
まとめ
トラウマやセプシスにおける血中乳酸の上昇は,単に組織低酸素ではなく,有酸素糖解離から生じる可能性があります. これは,高乳酸が常に貧弱な perfusion をシグナルするという仮定に挑戦しています.
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
- トラウマと重症病棟医療
背景:
- トラウマ/セプシスにおける高血糖 (ハイパーラクタシデミア) は,しばしば組織低酸素と無酸素糖解離を暗示する.
- この仮定は,血液動力学と尿量が正常である場合でも継続します.
- 酸素が充足した組織における乳酸生成のメカニズムは十分に研究されていない.
研究 の 目的:
- 負傷した患者における高乳糖血症の代替仮説を提案する.
- 乳酸生成における有酸素糖解の役割を調査する.
- 血中乳糖値上昇が,高血流の唯一の指標であるという,従来の解釈に異議を唱えるため.
主な方法:
- 細胞のエネルギー生産コンパートメントのレビュー (酸化対グリコリティック).
- Na+-K+ポンプ活動を刺激するエピネフリンの役割の検討.
- 負傷した患者のNa+,K+-ATPaseの活性と低カリミアの相関.
- 乳酸塩源として有酸素糖分解を仮定する.
主要な成果:
- エアロビック・グリコロシスは,エピネフリンによって刺激されるNa+-K+ポンプのためのATPを提供することができる.
- Na+,K+-ATPaseの活性が増加し,潜在的に低血糖症によって示され,エアロビック・グリコロシスを誘発する可能性があります.
- このメカニズムは,なぜ高乳糖血症が輸血指標と相関しないか,または酸素供給で改善しないかを説明する.
結論:
- トラウマ/セプシスにおける血中乳酸の上昇は,エピネフリン刺激によるNa+-K+ポンプ活動による骨格筋の有酸素糖解の増加を反映する可能性があります.
- これは,ヒポパーフュージョンによる無酸素糖解離のみを示す乳酸の伝統的な見方と対照的です.
- 蘇生のために高血糖にのみ依存することは,輸血やイノトロプのような不必要な介入につながる可能性があります.
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