慢性的な右心房圧過負荷に対する右心房および右心房の適応
Sydney L Gaynor1, Hersh S Maniar, Jeffrey B Bloch
1Division of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, MO 63110-1013, USA.
Circulation
|September 15, 2005
まとめ
慢性的な右心室圧力の過負荷は,腹動脈機能を損なうが,心動脈機能を維持する. 右心房は収縮性と伸縮性を高め,右心室の充填を維持し,肺高血圧の不全を防ぐために適応します.
科学分野:
- 心臓病学 心臓病学
- 生理学 生理学とは
- 肺高血圧の研究について
背景:
- 右心房圧の上昇は,肺高血圧の死亡率と関連しています.
- 右心房圧過負荷が右心房と心房の動態に与える影響に関する理解は限られている.
- 右心房の補充を維持する右心房の適応メカニズムは不明である.
研究 の 目的:
- 慢性的な右心室圧力過負荷が右心房および心室動態に及ぼす影響を調査する.
- 圧力過負荷条件下で右心房の充填を維持する際に右心房の適応反応を解明する.
主な方法:
- 3ヶ月間にわたって進行的な肺動脈帯形成の犬のモデルを使用しました.
- 導電性キャセテリゼーションを用いて右心房と心室の圧力と体積を測定した.
- 計算された右心房および心室の弾性および静脈硬化;定量化された右心房の貯水池および導管機能.
主要な成果:
- 慢性肺動脈帯膜症は,シストリック右心室圧力を著しく増加させましたが,心臓の出力を維持しました.
- 右心室の弾力性と硬さが増加し,シストリック機能の保存とダイアストリック機能の障害を示しています.
- 右心房の収縮性が改善され,心房はより伸縮しやすくなり,貯水器の機能が向上し,管の機能が低下しました.
結論:
- 慢性的な右心室圧力の過負荷は,シストリック機能を保ちますが,ダイアストリック機能を損なう.
- 右心房は,収縮性と伸縮性を高めることで補償し,硬化した心室を十分に満たすようにします.
- 右心房の適応反応は,慢性肺高血圧の臨床不全を予防する上で極めて重要です.
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