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Electrophysiological and Pathological Impact of Medium-Dose External Carbon Ion and Proton Beam Radiation on the Left Ventricle in an Animal Model

Research Project

Project/Area Number 19K17524
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53020:Cardiology-related
Research InstitutionKobe University

Principal Investigator

Takami Mitsuru  神戸大学, 医学部附属病院, 特定助教 (50793717)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords粒子線 / 炭素線 / 陽子線 / 放射線 / 不整脈 / 心室頻拍 / 心室細動 / 粒子線照射 / 電気生理学的変化 / 組織学的変化
Outline of Research at the Start

心臓不整脈に対する治療としてカテーテルを体内に挿入して行うカテーテルアブレーション治療は広く普及してきている。しかし難治性不整脈は少なくなく、かつカテーテルを体内に挿入する事による合併症も解決されていない。我々は体外から心臓に粒子線を照射する事により心臓の電気生理学的、組織学的変化をもたらす事が可能ではないかと考えた。本研究では神戸大学と兵庫県立粒子線医療センターとが共同し動物の心臓に粒子線(炭素線、陽子線)照射を行い電気生理学的、組織学的変化の検討を行う。このエネルギー源を使用すれば体内にカテーテルを挿入する事無く不整脈治療が可能となるかもしれない。

Outline of Final Research Achievements

External beam radiation using medium-dose (25 gray equivalent) carbon ion and proton beam resulted in significant electrophysiological disturbance and pathological changes in the myocardium of the left ventricle.Most electrophysiological and pathological changes were obvious at 3 months after radia-tion and continued at the 6-month follow-up.A large radiation area in the present study re-sulted in pericardial effusion, precordial skin ab-normalities, and partial radiation pneumonitis.Medium-dose carbon ion and proton beam radiation can modify the arrhythmogenic substrate in patients with catheter ablation-resistant ventricular tachycardia or ventricular fibrillation.When using this treatment, the radiation area should be focused as narrowly as possible to minimize radiation exposure to the surrounding normal tissues.

Academic Significance and Societal Importance of the Research Achievements

現在不整脈に対する治療として薬物治療やカテーテル心筋焼灼術などが進歩してきている。しかし難治性でかつ致死的な不整脈も存在し突然死などの原因にもなりうる。
粒子線照射はカテーテルなどを体内に挿入する事なく、体外から照射が可能であり侵襲度も低い。今回の研究結果から心臓への粒子線照射が今後、難治性不整脈に対する革新的治療法となる可能性が示唆された。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (4 results)

All 2021 2020

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

  • [Journal Article] Electrophysiological and Pathological Impact of Medium-Dose External Carbon Ion and Proton Beam Radiation on the Left Ventricle in an Animal Model.2021

    • Author(s)
      Takami M, Hara T, Okimoto T, Suga M, Fukuzawa K, Kiuchi K, Suehiro H, Akita T, Takemoto M, Nakamura T, Sakai J, Yatomi A, Nakasone K, Sonoda Y, Yamamoto K, Takahara H, Hirata KI.
    • Journal Title

      Journal of the American Heart Association

      Volume: 10 Issue: 7

    • DOI

      10.1161/jaha.120.019687

    • NAID

      120007033585

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Impact Of Non-invasive Middle-dose External Particle Beam Radiation On The Electrophysiological And Pathological Changes In The Animal Heart2020

    • Author(s)
      Takami M, Hara T, Okimoto T, Suga M, Fukuzawa K, Kiuchi K, Suehiro H, Akita T, Takemoto M, Nakamura T, Sakai J, Yatomi A, Nakasone K, Sonoda Y, Yamamoto K, Takahara H, Hirata KI.
    • Organizer
      Heart Rhythm 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Impact of Non-invasive External Particle Beam Radiation on the Electrophysiological and Pathological Changes in the Animal Heart2020

    • Author(s)
      Mitsuru Takami
    • Organizer
      第84回日本循環器学会学術集会
    • Related Report
      2019 Research-status Report
  • [Presentation] Impact of Non-invasive Middle-Dose External Particle Beam Radiation on the Electrophysiological and Pathological Changes in the Animal Heart2020

    • Author(s)
      Mitsuru Takami
    • Organizer
      Heart Rhythm 2020
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2022-12-28  

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