ウサギにおけるセシウム誘発の早期脱極化と心室不律に対する管刺激の効果
1Department of Laboratory Medicine, Oita Medical University, Japan.
Circulation
|December 1, 1992
まとめ
陰道刺激は,ウサギの早期アフターデポラライゼーション (EAD) を軽減することによって,多形心室性心拍動脈 (PVT) を抑制しました. モノモルフィック心室性低心率 (MVT) は抑制されず,陰道刺激によって再起動することができました.
科学分野:
- 心臓病学 心臓病学
- 電気生理学 電気生理学
- 薬理学 薬理学とは
背景:
- 交感性トーンが上昇すると,セシウム塩化物 (Cs) 誘発の早期アフターデポラライゼーション (EADs) と心室性短動脈 (VTs) が悪化する.
- Cs誘発性不律の調節におけるパラシンパティック活動,特に管刺激の役割は,まだ十分に理解されていません.
研究 の 目的:
- ウサギの心臓モデルで,Cs誘発のEADと心室不律に対する Vagus刺激の影響を調査する.
- ポリモルフィックVT (PVT) とモノモルフィックVT (MVT) のメカニズムと,それぞれに対する管刺激の影響を区別する.
主な方法:
- モノフェーシックアクションポテンシャル (MAP) と表面心電図は,ウサギの心臓で記録された.
- 2つのプロトコルが採用されました:Cs注射と陰道刺激による自発的なリズム,および制御された陰道刺激または陰道刺激の条件下でCs注射による心房ペース.
主要な成果:
- 塩化セシウム誘発EADとPVTとMVTの両方.
- ヴァガス刺激はPVTを抑制したが,MVTは抑制せず,自発的に終了した後にMVTを再開することができた.
- 陰道刺激は,対照群と比較して,EADの振幅を著しく低下させた.
結論:
- PVTはEADによって誘発されるように見えますが,MVTは異なる基礎メカニズムを持っています.
- ヴァガス刺激は,EADの振幅を低下させることでPVTに抗不律効果を発揮し,異なるVT形態学に対する差異的な効果を強調します.
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