イメージング・エレクトロカルディオグラフィー・ディスペルシオン・デポラライゼーション・リポラライゼーション・イン・イシュケミア: 身体表面と表心臓のマッピングを同時に行う
Martyn P Nash1, Chris P Bradley, David J Paterson
1University Laboratory of Physiology, University of Oxford, Oxford, UK. martyn.nash@auckland.ac.nz
Circulation
|April 23, 2003
まとめ
高解像度の幹部EKGマッピングは,標準の12リードEKGとは異なり,心筋不全時の心室再極化分散の変化を効果的に識別します. これは,心臓病の患者におけるリスク層分化の有望なツールです.
科学分野:
- 電気生理学 電気生理学
- 心血管科学の研究について
- メディカルイマージング (医学イメージング)
背景:
- 心筋動脈不全は,心臓の電気的特性を変化させることで,危険な心室不律を引き起こす可能性があります.
- 身体表面の電気測定を用いたリスクのある患者を特定するための現在の方法は,依然として議論の余地があります.
- 本研究は,体内の電気測定の有用性を調べ,イシュケミアの変化を検出する.
研究 の 目的:
- 局所性心室性イシュケミア中の電気変化を検出するために,体幹のEKG測定の感度を評価する.
- リポラライゼーションの異常を特定するために,高解像度トースのECGマッピングを標準の12リードECGと比較する.
- 誘発性イシュケミアの際の表心電図と体幹のEKG信号の関係を調査する.
主な方法:
- 麻酔した豚の表心電図と高密度幹部EKGを同時に記録する.
- 冠動脈結束モデルを用いた局所性心筋不全症の誘導.
- 活性化-回復間隔 (ARIs) と分散量 (QTu,RTu) の計算は,表心部と体幹の両方のデータから行う.
- 解剖学的にカスタマイズされた計算モデルを用いた分析.
主要な成果:
- 左前面下降動脈 (LAD) 閉塞は,上心動脈ARIの分散を大幅に増加させ,最短のARIの位置をシフトさせました.
- トルソのRTu分散も増加し,最短のRTu間隔がトルソ全体に移動した.
- QTuおよびRTu分散の標準の12リードEKG測定は,観察された心筋の変化を一貫して反映していない.
結論:
- 高解像度の幹部EKGマッピングは,局所性イシュケミア中の心筋再極化分散変化を確実に検出することができます.
- 標準の12鉛のEKG指数は,これらの不血症による再偏極化異常を正確に反映するのに不十分です.
- トルソ・EKGマッピングは,心室動脈不律症に敏感な患者のリスクの階層化を改善する可能性を示している.
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