冠動脈干渉後の異常な冠動脈の流れ速度予備は,心筋マーカーの上昇と関連しています
J Herrmann1, M Haude, A Lerman
1Department of Cardiology, University Clinic Essen, Essen, Germany.
Circulation
|May 23, 2001
まとめ
ステントを挿入した後の冠動脈の流れ速度の減少は,しばしばマイクロ血管障害を示唆します. この研究では,rCVRの減少は心臓酵素の上昇と関連しており,冠動脈手術中の栓塞によるマイクロ血管損傷を示唆しています.
科学分野:
- 心血管医学 心血管医学
- 介入性心臓病学 介入性心臓病学
- マイクロ血管生理学
背景:
- 冠動脈外科介入後の相対冠動脈流動速度準備 (rCVR) の低下は,マイクロ血管機能障害と関連しています.
- これらの症例における心臓酵素上昇が,栓塞性心筋損傷のマーカーとして発生する頻度は,まだ十分に研究されていない.
研究 の 目的:
- 冠動脈ステントの成功後に心臓酵素上昇 (クレアチンキナーゼとトロポニンT) の発生率を調査する.
- 術後のrCVRと心臓酵素上昇の相関を判断する.
- 心筋損傷を予測するためにrCVRのカットオフ値を特定する.
主な方法:
- 冠動脈ステントをペリプロシジュラル・イントラコロナリー・ドップラー分析で成功させた55人の患者を研究した.
- クレアチンキナーゼ (CK) および心臓トロポニンT (cTnT) レベルは,介入前および介入後24時間まで測定されました.
- rCVRと酵素上昇の関係を評価するために,相関と受容器動作特性 (ROC) の分析が行われました.
主要な成果:
- 術後のrCVRは独立してcTnT (r=-0.498,P<0.001) とCK上昇 (r=-0.406,P=0.002) と相関していた.
- rCVRのカットオフ値は0.78で,cTnTとCKの上昇を最もよく区別しています (感度83.3%/69.2%,特異性79.1%/76.2%).
- rCVR <0.78の患者は,cTnT (52.6%) とCK (36.8%) の上昇率が,rCVR ≥0.78 (5.6%の両方,P<0.001) の患者と比較して,著しく高かった.
結論:
- 心臓マーカーの上昇は,減少したrCVRに関連した冠動脈の手術後に頻繁に起こります.
- rCVRの持続的な低下は,アテロトロンボティック破片の手順的エンボライゼーションを示唆しています.
- 微血管機能障害と心筋損傷は,介入後の酵素上昇の潜在的根本的なメカニズムです.
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