コカインは,中心的な作用機構を通じて,人間の心血管系を刺激します
W Vongpatanasin1, Y Mansour, B Chavoshan
1Divisions of Hypertension and Cardiology, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Circulation
|August 3, 1999
まとめ
コカインは,ヒトの中央交感神経活動 (SNA) を著しく増加させ,血管収縮と心拍数の増加につながります. この研究は,コカインの直接的な証拠を提供します.
科学分野:
- 心血管生理学 心血管の生理学
- 神経薬理学神経薬理学について
- 人間の生理学 人間生理学
背景:
- コカインの心臓血管への影響は,部分的にノレピネフリン再吸収を阻害していることに起因する.
- 以前の理解は,コカインが中央交感性および準交感性アウトフローに与える影響を完全に明らかにしなかった.
研究 の 目的:
- コカインが心臓血管系を刺激し,中央交感性流出を増加させるかどうかを調査する.
- コカインが心拍のパラシンパティック制御を低下させるかどうかを判断する.
主な方法:
- マイクロニューログラフィーは,コカインに慣れていない健康なヒトの皮膚交感神経活動 (SNA) を測定するために使用されました.
- 血圧,心拍数,および皮膚の血流は,鼻内コカインまたはリドカイン投与前,中,および後にモニタリングされました.
- コカインが心拍数に及ぼす影響の媒介性を評価するために,薬理学的阻害 (プロプラノロール,アトロピン) を採用した.
主要な成果:
- 鼻内コカインは,90分間,皮膚SNAの有意で持続的な増加を誘発しました.
- コカインの投与は,皮膚の血流の減少,血管抵抗の増大,心拍の上昇につながった.
- コカイン誘発の低心拍はベータアドレナージック阻害によって解消されたが,ムスカリン阻害によって解消されなかった.
結論:
- 直接的なマイクロニューログラフィの証拠は,鼻内コカインがヒトの中央交感性アウトフローを刺激することを確認しています.
- コカインによって誘発される交感性活性化は,皮膚循環 (血管収縮) と心臓 (心拍不全) に影響します.
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