姿勢性短心症候群における低血圧ストレスへの反応として交感性神経の活動
1Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Mass 02215, USA.
Circulation
|November 10, 2004
まとめ
姿勢性低血圧症候群 (POTS) の患者は,静止状態では正常な交感性神経活動を示すが,低血圧状態では過剰な反応を示し,潜在的交感性無神経化を示唆する. これは,POTS.で血液動力学的コントロールに影響します.
科学分野:
- 心血管生理学 心血管の生理学
- 自律神経系の研究
- 神経学 神経学とは
背景:
- 姿勢性短心症候群 (POTS) は,交感性神経系の機能の変化と関連しています.
- POTSの病理生理学と血液動力学的制御における交感神経流出の正確な役割は不明である.
研究 の 目的:
- 交感神経流出とPOTS患者の血液動力学的調節への貢献を調査する.
- 低血圧チャレンジ中にPOTS患者と健康な対照群の間の共感反応を比較する.
主な方法:
- 骨筋の交感神経の活動は,9人のPOTS患者と9人の対照群で記録された.
- 測定は,静止状態と,ニトロプルーシドによる低血圧状態の間に行われました.
- 重要な指標には,バーストの頻度,バースト発生率,および平均バースト面積が含まれていました.
主要な成果:
- POTSの患者は,対照群よりも高血圧と高心率を発症しました.
- POTS患者では,休息時の交感性バーストの発生率が低かったが,バーストの頻度は類似していた.
- ニトロプルーシドは,同様の血圧低下にもかかわらず,POTS患者における同情性アウトフローのより大きな増加を誘導しました.
結論:
- POTSでは,静止した心拍数と正常な勃発頻度は,正常または高血圧に寄与する.
- 低血圧の間,POTS患者は心血管ホメオスタシスを維持するために,交感性アウトフローの増加を示します.
- 平均爆破面積の増加の欠如は,POTSで交感性神経細胞の活性化障害が交感性神経変異の基礎にある可能性があることを示唆しています.
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