心臓ペースメーカーの刺激中に,前帯状皮質の脳血流と血のノラドレナリン濃度の増加
Hideaki Suzuki1, Shunsuke Tatebe1, Tomoki Irino1
1Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine.
まとめ
心臓の電気刺激は,前帯状皮質 (ACC) を含む脳領域を活性化し,ノラドレナリンレベルを上昇させます. ACCは心臓の信号を処理し,ペースの過程で自律的興奮に影響を与えるように見える.
科学分野:
- 神経科学は神経科学である.
- 心臓病学 心臓病学
- メディカルイマージング (医学イメージング)
背景:
- 胸痛のような胸部症状は,心血管疾患ではよく見られる.
- 心臓アファレント情報に関する脳の処理に関する研究は限られている.
研究 の 目的:
- 心臓の電気刺激中に脳活動の変化を調査する.
- 心臓のアファレント信号の処理に関与する脳領域を特定する.
主な方法:
- ペースメーカーを装着した10人の患者は,脳をH215O-PETスキャンした.
- シームと電気刺激のペースでスキャンが行われました.
- 地域脳血流 (rCBF) と血ノルアドレナリンを測定した.
主要な成果:
- 電気刺激は前帯状皮質 (ACC),後帯状皮質,前頭前皮質,タラマス,桃体,中脳におけるrCBFを増加させた.
- ACC rCBFと血のノルアドレナリン濃度は,刺激中に著しく上昇した.
- ACC rCBFとプラズマのノルアドレナリンとの間に正の相関が認められた.
結論:
- 心臓の電気刺激は,ACCにおけるrCBFを強化し,血のノルアドレナリンを増加させます.
- ACCは,心筋アファレント情報を処理するための中央ハブとして機能します.
- この処理は,心臓のペースを調整する時に自律的興奮に寄与する.
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