生まれながらの長QT症候群における電気生理学的基板:心電図画像 (ECGI) による非侵襲的マッピング
Ramya Vijayakumar1,2, Jennifer N A Silva1,3, Kavit A Desouza4
1Cardiac Bioelectricity and Arrhythmia Center, Washington University in St. Louis, Saint Louis, MO.
Circulation
|October 9, 2014
まとめ
生まれながらの長QT症候群 (LQTS) の患者は,標準的なEKGでは見えない地域再偏振異常を示します. これらの発見は,EKG画像が,LQTS患者のリスクの階層化に役立つ可能性があることを示唆しています.
科学分野:
- 心臓病学 心臓病学
- 電気生理学 電気生理学
- メディカルイマージング (医学イメージング)
背景:
- 生まれながらの長QT症候群 (LQTS) は,昏睡と突然死を引き起こす遺伝疾患です.
- LQTS変異とヒトにおける心律乱症の感受性を結びつける正確なメカニズムは不明である.
- 非侵襲的なECGイメージングは,LQTS.の心臓電気生理学的基板を調査するために使用されました.
研究 の 目的:
- ECG画像を用いたLQTS患者の心臓電気生理学的基板のマッピング.
- LQTS患者の地域再極化異質性を示すかどうかを判断する.
- リポラライゼーション異常と臨床症状の関係を評価する.
主な方法:
- ECG画像は25人のLQTS患者 (LQT1,LQT2,LQT3,LQT5) と7人の対照群で実施した.
- 活性化,回復時間,活性化-回復間隔,および再極化分散のエピカルディアの地図が作成されました.
- 分析は,LQTS患者と対照群のリポラライゼーションパラメータを比較することに焦点を当てました.
主要な成果:
- LQTSの患者は,対照群と比較して,回復時間が長く,活性化-回復の間隔が長かった.
- アクティベーション・リカバリー間隔の延長は空間的に異質で,リポラライゼーションのグラデーションがかなり急かった.
- リポラライゼーショングラデーションは,症状のあるLQTS患者では,無症状患者よりも急でした.
結論:
- LQTS患者には,長期にわたるアクションポテンシャル持続の局所的な領域があり,急激な再偏極化分散を引き起こします.
- この分散は,表面心電図で検出できない再発性不律症の基板を形成する.
- ECGイメージングは,LQTSにおけるリスクの階層化,特に症状のある個体において,価値のあるものです.
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