ハイパートロフィック心筋症候群において,仰向け運動に対する異常な血管反応
P J Counihan1, M P Frenneaux, D J Webb
1Department of Cardiological Sciences, St. George's Hospital Medical School, London, UK.
Circulation
|August 1, 1991
まとめ
運動中の異常な外周血管応答は,高圧性心筋病 (HCM) の運動低血圧と関連しています. これらの血液動力学的不安定性,特にHCMの家族歴のある若い患者では,突然の心臓死につながる可能性があります.
科学分野:
- 心臓病学 心臓病学
- 運動生理学 運動生理学
- 血管生物学 血管生物学
背景:
- 運動による低血圧は,多動性心筋病 (HCM) で観察される.
- この低血圧は,心臓の出力の低下によるものではなく,むしろ,高い作業量中に全身血管抵抗の不適切な減少によるものです.
研究 の 目的:
- HCM患者の運動中の周周血管応答を調査する.
- HCMにおける異常な血管反応と運動による低血圧の関係を見極める.
主な方法:
- HCM患者103人が,前腕の血流量測定と横たわる自転車運動を行いました.
- 前腕の血流が少なくとも12%減少することは正常とみなされた.
- 患者はまた,勃起した運動中に血圧応答を評価するためにトレッドミルの運動テストを受けました.
主要な成果:
- 2つの前腕の血流パターンが観察されました:64人の患者は適切な減少を示し,39人は減少または増加を示しませんでした.
- 前腕の血流反応が異常な患者は,より若く,HCMの家族歴や突然死亡の発生率が高かった.
- 前腕の異常な血流反応を有する39人の患者のうち31人が,勃起した状態でのテスト中に運動低血圧を示した.
結論:
- 異常な外周血管応答は,HCMにおける運動低血圧と相関しており,血動力学的不安定性を示している.
- 高リスク患者における異常な血管反応の存在は,HCM内の突然心臓死における血液動力学的メカニズムの役割を示唆しています.
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