高解像度光学マッピングで評価された肺静脈のリズム不振性基板
Rishi Arora1, Sander Verheule, Luis Scott
1Krannert Institute of Cardiology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
Circulation
|April 1, 2003
まとめ
肺静脈 (PVs) は,リエントリーと焦点放電を通じた焦点心房細動を開始することができます. 高解像度の光学マッピングにより,電導速度の減速とPVの再極化異質性が明らかになり,これらのメカニズムを裏付けました.
科学分野:
- 心血管電気生理学 心血管電気生理学
- 心律不整症とは,心律不整症のこと.
- 肺静脈の研究について
背景:
- 心房細動 (AF) は,肺静脈 (PVs) 内の焦点源から発生することがあります.
- PVの焦点AFを駆動する正確な電気生理学的メカニズムは,まだ完全に理解されていません.
- PV電気生理学の研究は,AFの起源を理解するために不可欠です.
研究 の 目的:
- 肺静脈の電気生理学的性質を特徴づけるために.
- PVs内の再入場と焦点放電の可能性を調査する.
- PVsから発生する焦点心房細動の基質を明らかにする.
主な方法:
- 高解像度光学マッピングを使用して,孤立した冠動脈に浸透した全心房の犬用製剤を使用しました.
- PVの4cm2の領域に同時に256のトランスメブランアクションポテンシャルを記録しました.
- プログラムされた電気刺激を行い,導電速度と再極化特性を評価した.
主要な成果:
- 他の領域と比較して,近親肺静脈で有意な伝導の減速が観察されました.
- 顕著な再極化異質性を特定し,PV内心部で最も長いアクションポテンシャル持続時間を示した.
- 誘発された不持続のリエントラントビートと視覚化されたリエントラントループ; 静脈性オスティウム近くの内臓表面から持続した焦点放電が発生しました.
結論:
- 正常な肺静脈は,再侵入と焦点活動の両方をサポートするための電気生理学的基板を持っています.
- 再入力は,主にPV内のより遠くに観察され,焦点活動はより近接的に発生しました.
- これらの発見は,PVを焦点心房細動の重要な源として強調しています.
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