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Effect of ketamine on spinal synaptic transmission: electrophysiological analysis

Research Project

Project/Area Number 18K08810
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 55050:Anesthesiology-related
Research InstitutionNiigata University

Principal Investigator

Furutani Kenta  新潟大学, 医歯学系, 准教授 (40535176)

Project Period (FY) 2022-01-04 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsケタミン / 誘発電位 / 脊髄 / パッチクランプ / 脊髄後角 / 運動誘発電位 / 神経モニタリング / 運藤誘発電位 / 麻酔
Outline of Research at the Start

全身麻酔薬がどこに作用するか、未だ明確ではない。静脈麻酔薬のケタミンは、麻酔作用とともに痛みや抑うつ症状を改善する。この作用は、主にグルタミン酸受容体に対する抑制作用から説明されてきたが、脊髄での作用は明らかにされていない。本研究では、臨床研究、および基礎研究の両面から、ケタミンの脊髄における作用について解明することを目的とする。

Outline of Final Research Achievements

Ketamine had been believed to have little effect on amplitude of motor-evoked potential. However, our double blinded, randomized, placebo-controlled trial demonstrated that a bolus administration of ketamine (1 mg/kg) reduced the amplitude of MEP.
Next,I tried to show the mechanism how ketamine reduce the amplitude of evoked potential. A patch clamp recording from spinal dorsal horn neurons of rat showed that bath-application of ketamine reduced the amplitude of NMDA-induced current. However, ketamine did not affect the frequency and amplitude of spontaneous excitatorry postsynaptic current, These results indicate that ketamine in a clinical dose may not affect synaptic transmission in spinal dorsal horn.

Academic Significance and Societal Importance of the Research Achievements

ケタミンは鎮静作用と鎮痛作用を併せ持つ。術中の運動機能モニタリングに運動誘発電位が用いられているが、運動誘発電位には影響を与えない薬剤とされてきた。しかし、我々はケタミンが運動誘発電位を抑制することを臨床研究によって証明した。
ケタミンには鎮痛作用があるが、痛み感覚の中継場所である脊髄後角ニューロンに対し、どのような作用があるかわかっていなかった。ラットの脊髄を用いた実験により、ケタミンはグルタミン酸受容体を抑制する一方で、シナプス伝達機構には大きな影響を与えないことが分かった。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (8 results)

All 2022 2021 2020 2019 2018

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Low-dose Droperidol Reduces the Amplitude of Transcranial Electrical Motor-evoked Potential2021

    • Author(s)
      Mitsuma Yusuke、Furutani Kenta、Deguchi Hiroyuki、Kamiya Yoshinori、Tanaka Takahiro、Kitamura Nobutaka、Baba Hiroshi
    • Journal Title

      Journal of Neurosurgical Anesthesiology

      Volume: Publish Ahead of Print Issue: 4 Pages: 424-428

    • DOI

      10.1097/ana.0000000000000784

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Low-dose droperidol suppresses transcranial electrical motor-evoked potential amplitude: a retrospective study2020

    • Author(s)
      Deguchi Hiroyuki、Furutani Kenta、Mitsuma Yusuke、Kamiya Yoshinori、Baba Hiroshi
    • Journal Title

      Journal of Clinical Monitoring and Computing

      Volume: Publish Ahead of Print Issue: 1 Pages: 1-1

    • DOI

      10.1007/s10877-020-00464-4

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Epidural Administration of Ropivacaine Reduces the Amplitude of Transcranial Electrical Motor?Evoked Potentials2020

    • Author(s)
      Furutani Kenta、Tobita Toshiyuki、Ishii Hideaki、Deguchi Hiroyuki、Mitsuma Yusuke、Kamiya Yoshinori、Baba Hiroshi
    • Journal Title

      Anesthesia & Analgesia

      Volume: Publish Ahead of Print Issue: 4 Pages: 1-1

    • DOI

      10.1213/ane.0000000000005236

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A Bolus Dose of Ketamine Reduces the Amplitude of the Transcranial Electrical Motor-evoked Potential: A Randomized, Double-blinded, Placebo-controlled Study2019

    • Author(s)
      Furutani K, Degichi H, Matsuhashi M, Mitsuma Y, Kamiya Y, Baba H
    • Journal Title

      J Neurosurg Anesthesiol

      Volume: Oct, 16 Issue: 3 Pages: 1-1

    • DOI

      10.1097/ana.0000000000000653

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Marked attenuation of the amplitude of transcranial motor-evoked potentials after intravenous bolus administration of ketamine: a case report2018

    • Author(s)
      Furutani Kenta、Matsuhashi Mari、Deguchi Hiroyuki、Mitsuma Yusuke、Ohashi Nobuko、Baba Hiroshi
    • Journal Title

      Journal of Medical Case Reports

      Volume: 12 Issue: 1 Pages: 204-204

    • DOI

      10.1186/s13256-018-1741-9

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 運動誘発電位を用いた麻酔薬の作用の解析2022

    • Author(s)
      古谷健太
    • Organizer
      日本臨床麻酔学会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] ケタミンのボーラス投与は運動誘発電位の振幅を減少させる(無作為化比較試験)2018

    • Author(s)
      古谷健太、出口浩之、松橋麻里、三ツ間祐介、馬場洋
    • Organizer
      日本麻酔科学会第65回学術集会
    • Related Report
      2018 Research-status Report
  • [Presentation] Bolus administration of ketamine reduced the amplitude of transcranial electrical motor evoked potential: a randomized controlled trial2018

    • Author(s)
      Kenta Furutani, Hiroyuki Deguchi, Yusuke Mitsuma, Hiroshi Baba
    • Organizer
      annual meeting of the American society of anesthesiologists
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2024-12-25  

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