左心室の逆転リモデリングは臨床的な改善ではないが,心臓再同期療法後の長期的な生存を予測する
Cheuk-Man Yu1, Gabe B Bleeker, Jeffrey Wing-Hong Fung
1Division of Cardiology, Department of Medicine and Therapeutics, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, Hong Kong. cmyu@cuhk.edu.hk
Circulation
|September 8, 2005
まとめ
心臓再同期療法 (CRT) の後の左心室末縮量 (LVESV) の10%の減少は,重要な逆転改造を示しています. この改善は,重度の心不全の患者において,よりよい長期生存率とより少ない心不全イベントを予測する.
科学分野:
- 心臓病学 心臓病学
- 心不全管理について
- 医療介入 医療介入について
背景:
- 心臓再同期療法 (CRT) は,左心室 (LV) の機能と重度の心不全での生存を改善します.
- LV逆転改造の長期的な予後的意義と,CRT後の臨床的に有意義な程度は不明である.
研究 の 目的:
- CRT後のLVリバースリモデリングが長期的な予後を予測するかどうかを判断する.
- 患者のアウトカムにとって臨床的に重要なLVリバースリモデリングの特定の程度を特定する.
主な方法:
- 進行性心不全でCRTを投与された141人の患者を平均695日間追跡した.
- 3~6ヶ月の左心室末縮容量 (LVESV) の減少は,死亡率予測のカットオフ値を見つけるために,受容器操作特性 (ROC) 曲線を使用して分析されました.
- カプラン・マイヤー生存とコックスの回帰分析では,リバースリモデリングに反応した人と反応しなかった人の結果を比較した.
主要な成果:
- 死亡率を予測するための最適なカットオフとして,LVESVの≥9.5%の減少が特定されました (70%の感度,全原因の70%の特異性;心血管疾患の87%の感度,69%の特異性).
- 患者の61.7%は,リバースリモデリングへの反応として分類されました.
- 回答者は,すべての原因による死亡率 (6.9% vs. 30.6%),心血管疾患による死亡率 (2.3% vs. 24.1%),心不全イベント (11.5% vs. 33.3%) が,非回答者と比較して有意に低いことを示しました.
- LVESVの変化は,臨床パラメータを上回る死亡率の最も強力な予測因子でした.
結論:
- LVESVの≥10%の減少は,CRT後の臨床的に重要な逆転改造を意味します.
- この程度の逆転改造は,長期的な死亡率の低下と心不全の発生を予測する強力な指標です.
- 介入後の体積変化の評価は,心不全患者のための貴重な予後情報を提供します.
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