慢性血栓栓性肺高血圧患者の酸素経路の制限

Erin J Howden¹, Sergio Ruiz-Carmona^2,1, Mathias Claeys^3,4

¹Baker Heart and Diabetes Institute (E.J.H., S.R.-C., A.L.G., G.C.), Melbourne, Australia.

Circulation

|April 15, 2021

まとめ

慢性栓塞性肺高血圧 (CTEPH) の患者は,酸素経路の障害により運動能力が低下します. 介入によって酸素の供給が改善されても周辺の酸素抽出は限られているので更に治療が必要だと考えられます

科学分野:

心肺医学
運動生理学
血管生物学

背景:

運動不耐性は慢性肺栓塞性高血圧 (CTEPH) の主要な制限である.
伝統的な理解は中央の血液動力学的要因に焦点を当てていたが,介入後も限界が残っている.
酸素経路の体系的な評価は,残留機能的欠陥を理解するために不可欠です.

研究の目的:

酸素経路を評価することによって,CTEPH患者の機能的制限の原因を解明する.
CTEPH患者の酸素輸送カスケードステップを健康な個人と比較する.
肺血管介入が酸素カスケードに与える影響を評価する.

主な方法:

心臓の磁気共鳴画像と侵入的血液動力学的モニタリングを使用しました
口からミトコンドリアへの O2 輸送の段階を定量化した.
介入後のサブセット (n=10) を含む,CTEPH患者 (n=20) と健康な対照群を評価した.

主要な成果:

CTEPH患者では,対照群と比較して,ピーク酸素摂取量 (Vo2) が著しく減少した (56%).
酸素の供給,骨格筋の拡散,肺の拡散に障害が認められた.
心臓の出力と肺の拡散を高めることで,ピークVo2 (予測の70%まで) が改善されたが,周辺のO2抽出は変化しなかった.

結論:

CTEPHの患者は,運動能力に影響する,広範囲にわたるO2利用カスケード障害を示します.
肺血管介入は酸素の供給を改善することで運動能力を部分的に回復させます
外周酸素抽出は治療戦略の必要性を強調しています

キーワード:

心臓の出力運動する心臓の心室肺高血圧磁気共鳴画像検査システム生物学

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