大動脈弁の狭窄症患者の運動に対する全身動脈応答
Warren K Laskey1, William G Kussmaul, Abraham Noordergraaf
1Division of Cardiology, Department of Medicine, University of New Mexico, Albuquerque, NM 87131, USA. warrenlaskey@earthlink.net
Circulation
|February 11, 2009
まとめ
大動脈弁の狭窄症 (AVS) の患者は,動脈の負荷と硬さが増加し,運動中に脳卒中の出力反応が低下します. この動脈硬化は,AVSで観察される運動能力の低下の重要な要因です.
科学分野:
- 心血管生理学 心血管の生理学
- バイオメディカルエンジニアリング
- クリニカル・ヘモダイナミクス
背景:
- システミック動脈血動力学は,大動脈弁狭窄症 (AVS) の重症度および結果の評価に不可欠です.
- AVSにおける動脈負荷を理解することは,患者のアウトカムを管理するために不可欠です.
研究 の 目的:
- 静止状態および運動中のAVS患者における全身動脈動脈動力学的特性を調査する.
- AVSにおける運動反応の低下に対する動脈負荷の寄与を決定する.
主な方法:
- 高精度カテーテルで,主動脈圧の上昇と血流の速度を記録した.
- 18人のAVS患者と11人の対照群で,休憩状態と横の自転車運動中に測定を行った.
- システム血管抵抗,動脈適合,動脈弾性,大動脈特異阻害を計算した.
主要な成果:
- AVS患者では,対照群と比較して,全身血管抵抗,動脈弾性,および静止状態における大動脈特有阻害が増加した.
- 静止状態のAVS患者では全動脈コンプライアンスが低く,対照群とは異なり,運動によって増加することはなかった.
- 運動はAVS患者の動脈弾力性の増加につながり,脳卒中の流れの増加は弱まりました.
結論:
- AVSの患者は,圧力に関係なく,安定した脈動性の動脈負荷成分が上昇しています.
- AVSにおける持続的な動脈硬化が,運動に対する脳卒中出力反応の低下に大きく寄与する.
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