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Quantification of Nociceptive Pain by EEG Gamma Oscillations in the Primary Somatosensory Cortex for Precision Postoperative Analgesia

Research Project

Project/Area Number 22K09063
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

KAMATA Kotoe  東北大学, 大学病院, 講師 (60339033)

Co-Investigator(Kenkyū-buntansha) 山内 正憲  東北大学, 医学系研究科, 教授 (00404723)
杉野 繁一  東北大学, 大学病院, 准教授 (00423765)
城戸 幹太  北海道大学, 歯学研究院, 教授 (40343032)
萩平 哲  関西医科大学, 医学部, 教授 (90243229)
村上 徹  東北大学, 大学病院, 助教 (90756248)
Project Period (FY) 2022-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2024: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords脳波 / 疼痛 / ガンマ振動 / 疼痛モニタリング / 術後鎮痛
Outline of Research at the Start

われわれは末梢に入力され,疼痛伝達経路を経て,最終的に疼痛を認知する1次体性感覚野(S1)で記録される局所の脳波に着目した.本研究では疼痛モニター開発のために,まず手術中のS1における脳波ガンマ振動と術後痛との関連性を明らかにする.具体的には,1)健常ボランティアにおける侵害受容刺激に対するS1での脳波ガンマ振動の特性変化や,疼痛認知閾値の個体差とS1脳波ガンマ振動の関連の検討,2)マウス足底手術モデルにおけるオプトジェネティックスを用いたS1脳波ガンマ振動変化の術後痛の個体差への影響の検討,3)手術患者における術中のS1脳波ガンマ振動特性と術後痛の個体差の関連の検証,である.

Outline of Final Research Achievements

Pain assessment is subjective, presenting challenges in clinical practice, especially in patients under general anesthesia where conventional tools like NRS or the Faces Pain Scale cannot be used. To explore an objective marker, we focused on gamma oscillations in EEG recordings from the primary somatosensory cortex (S1), which is known for its role in pain processing. Stepwise electrical stimulation was applied to the forearms of healthy volunteers while EEG signals were recorded. Gamma-band activity was reliably elicited in response to stronger stimuli, and its presence correlated with higher NRS scores. These findings suggest that S1 gamma oscillations may reflect both nociceptive input and the perceived intensity of pain.

Academic Significance and Societal Importance of the Research Achievements

多くの手術患者にとって最大の関心事は「術後に痛みがないこと」であり,その実現には的確な疼痛評価が不可欠である.しかし,疼痛が主観的感覚であるがゆえに定量的な評価が困難であることは,これまで臨床現場における大きなジレンマであった.本研究により,一次体性感覚野(S1)の脳波ガンマ振動に基づく客観的な疼痛評価手法の可能性が示されたことは,術後疼痛モニタリングの新たな指標となりうる.今後,本成果を応用した疼痛モニターの開発と,個別化された術後鎮痛戦略への展開が期待される.

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (4 results)

All 2024 Other

All Int'l Joint Research (1 results) Journal Article (1 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] Tampere University(フィンランド)

    • Related Report
      2024 Annual Research Report
  • [Journal Article] 麻酔薬と脳波2024

    • Author(s)
      鎌田ことえ
    • Journal Title

      日本臨床麻酔学会誌

      Volume: 44 Pages: 52-60

    • Related Report
      2024 Annual Research Report
  • [Presentation] 脳波で痛みを見ることはできるか2024

    • Author(s)
      間島卓哉,鎌田ことえ
    • Organizer
      日本区域麻酔学会第11回学術集会
    • Related Report
      2023 Research-status Report
  • [Presentation] Gamma Oscillations of Electroencephalogram after Applications of Electrical Stimulation: A Preliminary Volunteer Study2024

    • Author(s)
      T. Mashima, K. Kamata, T. Lipping, S. Sugino, S. Hagihira, M. Yamauchi
    • Organizer
      Euroanaesthesia
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research

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Published: 2022-04-19   Modified: 2026-01-16  

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