脳対肺:上部空腔肺連結を有する単一心房患者のフィードバックループの階層
Mark A Fogel1, Suzanne Durning, Gil Wernovsky
1Division of Cardiology, Department of Pediatrics, The Children's Hospital of Philadelphia, The University of Pennsylvania School of Medicine, Philadelphia, Pa 19104, USA. fogel@email.chop.edu
Circulation
|September 15, 2004
まとめ
SCPCの生理学では,二酸化炭素 (CO2) のレベルが上昇すると,脳と肺の血流が著しく増加し,CO2が示されます.
科学分野:
- 心血管生理学 心血管の生理学
- ペディアトリック・カルディオロジー
- 呼吸器生理学 呼吸器生理学とは
背景:
- 脳血管系はCO2で血管を広げ,O2で血管を収縮させるが,肺血管系は逆の反応を示している.
- 連続循環における主要なフィードバックメカニズム (脳と肺) は不明である.
- 上部腔肺連結 (SCPC) 生理学は,競合する血管フィードバックループを調査するためのユニークなモデルを提供します.
研究 の 目的:
- SCPC生理学における脳および肺血管フィードバックメカニズムの階層を決定する.
- 変化したCO2とO2レベルが脳と肺の血流に与える影響を評価する.
- 酸素輸送と心臓の出力に与える影響を評価するために.
主な方法:
- SCPCの生理学を持つ12人の単一室患者 (年齢2.2±0.5歳) が研究されました.
- 磁気共鳴画像 (MRI) 速度マッピングにより,動脈と大動脈の血流が評価されました.
- 測定は室内の空気,高炭水化物 (高CO2),100%O2の条件下で行われ,動脈血中ガス分析が行われました.
主要な成果:
- 増加したCO2 (40から63mmHg) は,脳と肺の血流量 (1.5から2.7L/分/m2) と心臓指数 (4.3から5.4L/分/m2) を大幅に増加させた.
- 心臓指数の上昇は,脳と肺への血流の増加と相関していた (R=0.73,P=0.02).
- 高酸素症 (100%O2) は,動脈のO2レベルが大幅に上昇したにもかかわらず,脳および肺の血流を変化させなかった.
結論:
- 脳のCO2フィードバックループは,SCPC生理学における肺のO2フィードバックループよりも優位である.
- CO2濃度の上昇は,脳と肺の血流分布に大きく影響し,脳の酸素供給を改善する.
- 発見は,SCPC患者における神経学的合併症とFontan完了タイミングの理解を促す可能性がある.
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