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Updated: May 12, 2026

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Quantitative Autonomic Testing
Published on: July 19, 2011
思春期における体位静脈血管性シンコープとスプランク性高血量症の関係
Julian M Stewart1, Kenneth J McLeod, Sanjukta Sanyal
1Department of Pediatrics, The Center for Pediatric Hypotension, Suite 618, Munger Pavilion, New York Medical College, Valhalla, NY 10595, USA. stewart@nymc.edu
Circulation
|October 20, 2004
まとめ
単純な昏睡は,立つので胸部血量減少とスプランク血量増加によって引き起こされる可能性があります. これらの発見は,姿勢性昏睡のメカニズムについての洞察を提供します.
科学分野:
- 心血管生理学 心血管の生理学
- 自律神経系の機能 自律神経系の機能
- 人間の生理学 人間生理学
背景:
- 昏睡の一般的な原因である単純な昏睡の根本的なメカニズムは,完全に理解されていません.
- 本研究では,姿勢性昏睡を経験する患者の静止状態中の血液量再分配の役割を調査しています.
研究 の 目的:
- 直立した姿勢中の過剰な胸部低血圧症とスプランク性高血圧症が,姿勢による単純な昏睡と関連しているかどうかを判断する.
- オーソスタティック・ストレスのときの弱体と健康な個人の血量変化を比較するために.
主な方法:
- 再発した姿勢性昏睡の34人の患者と11人の健康な対照群は,仰向けと70度直立の傾きテストを受けました.
- 静脈閉塞プレシスモグラフィーとインピデンスプレシスモグラフィーを使用して,血流と体積の再分配を評価しました.
- 被験者は,テスト中に昏睡した者 (S+) と,昏睡しなかった者 (S-) とに分けられた.
主要な成果:
- 前腕や小児の血流量,心臓指数,全周回路抵抗,全血量などにおいて,グループ間で有意な差異は認められなかった.
- 直立の傾きは,すべての被験者において胸部血量減少とスプランク,骨盤,足の血量増加を示した.
- 昏睡した患者 (S+) は,対照群と比較して胸部血量の大幅な減少を示し,最大心拍数と相関していました.
結論:
- 姿勢による単純な昏睡は,直立した姿勢では,胸部ヒポヴォーレミアとスプランクニクヒポヴォーレミアの強化と関連しています.
- これらの発見は,血液量再分配の特定のパターンが,単純な昏睡の病理生理学に貢献することを示唆しています.
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