イシュケミアの反応として急性右心房の膨張は,左心房のシストリックパフォーマンスを著しく低下させます
Circulation
|August 18, 1999
まとめ
右心室梗塞は部分的に左心室のシストリック機能の障害による血液動力学的不安定を引き起こし,プレロードまたはコンプライアンスの変化だけでなく. これは,心臓の出力と心室の性能に影響を及ぼします.
科学分野:
- 心血管生理学 心血管の生理学
- 心臓外科手術について
- ヘモダイナミクス (血動力学)
背景:
- 心臓発作による右心房 (RV) の膨張は,血液動力学的不安定性を引き起こす可能性があります.
- この不安定性は,従来,左心室 (LV) のプレロードとコンプライアンスが低下したためとされている.
- この研究では,幾何学的変化がLVのシストリックパフォーマンスを損なうかどうかを調べました.
研究 の 目的:
- RVの膨張がLVのシストリックパフォーマンスに悪影響を及ぼすという仮説を検証する.
- プレロード/コンプライアンスによる変化の影響をシストリック機能不全から区別する.
主な方法:
- 両心室に導電性カテーテルとマイクロマノメーターを組み込んだ12頭の豚を研究した.
- 左右の右冠動脈閉塞経由で誘発されたRVイシュケミアが,様々な心周状態とイノトロプ的サポート下で発生する.
- 記録された同時圧力,体積,および派生した収縮機能指数.
主要な成果:
- 完ぺきな心帯:RVイシュミアは,LVの末期ダイアストリック体積と収縮機能を低下させた.
- 開いた心帯:RVとLVの膨張は,心臓の出力とLVのパフォーマンスにマイナスの影響を及ぼさなかった.
- イシュケミア中のイノトロプ的サポートは,LVの収縮性能を改善しました.
結論:
- 急性RV膨張における血液動力学的妥協は,部分的にLVのシストリック性能の低下によるものです.
- 影響は,LVのプレロードまたはコンプライアンスによってのみ説明できない.
- 心筋の制約は,VVの拡張がLVの機能に与える影響に大きな影響を与えます.
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