低梯度大動脈狭窄における術後射出分数に対する術前左心房収縮準備の影響
Jean-Paul Quere1, Jean-Luc Monin, Franck Levy
1Department of Cardiology, INSERM, ERI-12, University Hospital, Amiens, France.
Circulation
|April 6, 2006
まとめ
ドブタミンストレス血液動力学 (DSH) は,低梯度大動脈狭窄症 (AS) の手術リスクを評価することができます. DSHの収縮準備の欠如は,生存者の大動脈弁置換術 (AVR) の後の左心室射出分数 (LVEF) の回復が悪いことを予測しません.
科学分野:
- 心臓病学 心臓病学
- 心臓外科手術について
- ヘモダイナミクス (血動力学)
背景:
- 低梯度性大動脈狭窄症 (AS) は,手術リスクの階層化において課題を提示する.
- ドブタミンストレス血液動力学 (DSH) は,手術リスクを評価するための潜在的なツールです.
- ASにおける左心室収縮準備と術後の左心室放出分数 (LVEF) の関係については,さらなる調査が必要である.
研究 の 目的:
- 低梯度性AS患者の術後のLVEF改善に対するDSHの予測価値を評価する.
- 大動脈弁置換 (AVR) の後のLVEF回復に対する左心房収縮準備の影響を評価する.
主な方法:
- 症状のある重症AS,LVEF ≤40%,平均グラデント ≤40mmHgの66人の患者の将来的な登録.
- DSHを用いた術前収縮準備の評価.
- AVR後のフォローアップにおけるLVEFとニューヨーク心臓協会 (NYHA) のクラス変化の評価.
主要な成果:
- 58%の患者がAVR後の2つのNYHAクラスで改善し,平均LVEFは29%から47%に増加しました.
- LVEFは,収縮準備を持つ患者の83%と,収縮準備を持たない患者の65%で改善され,グループ間の平均LVEF改善も同様でした.
- 多変量分析により,LVEFの改善の予測指標として,多血管冠動脈疾患とベースラインの平均トランザコルティック圧力グラデントが特定されましたが,収縮準備は認められませんでした.
結論:
- LVEFは,手術後に生存した低梯度AS患者のAVR後に一般的に増加します.
- DSHにおける収縮準備の欠如は,より高い手術死亡率と関連していますが,生存者のLVEF回復を妨げることはありません.
- 低梯度ASの手術は,DSHの収縮準備の欠如のみに基づいて禁忌であるべきではありません.
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