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Establishment of Criteria for Judging the Effectiveness of Laser Photocoagulation Using Fundus Autofluorescence as an Indicator of Scar Formation Process

Research Project

Project/Area Number 20K09777
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 56060:Ophthalmology-related
Research InstitutionNagoya City University

Principal Investigator

Nozaki Miho  名古屋市立大学, 医薬学総合研究院(医学), 教授 (00295601)

Co-Investigator(Kenkyū-buntansha) 高瀬 範明  名古屋市立大学, 医薬学総合研究院(医学), 研究員 (00812124)
小椋 祐一郎  名古屋市立大学, 医薬学総合研究院(医学), 教授 (70191963)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords糖尿病網膜症 / ショートパルスレーザー / 汎網膜光凝固 / 眼底自発蛍光 / レーザー網膜光凝固 / パターンスキャンレーザー / 従来凝固 / ショートパルス凝固 / 自発蛍光 / パターン凝固 / 瘢痕拡大
Outline of Research at the Start

糖尿病網膜症治療で用いられているショートパルスレーザーは、治療効果が従来凝固よりも弱い危険性も示唆されてきている。本研究では、汎網膜光凝固の際、ショートパルスレーザーでは凝固数を増やしても、従来レーザーと同等の効果は得られないのか?という問いに答えるために、
(1)マウスを用い従来レーザーとショートパルスレーザーで光凝固後の網膜・脈絡膜の変化とサイトカイン出現の違いを眼底自発蛍光、免疫染色および分子生物学的手法で解析し、
(2) 臨床的に眼底自発蛍光で観察される凝固斑の低蛍光化の時期を、従来レーザーとショートパルスレーザーで比較し、糖尿病網膜症悪化との相関を後ろ向きに検討する。

Outline of Final Research Achievements

Short-pulse laser is popular for its advantages like less pain. However, its effectiveness compared to conventional laser is still debated. The aim of this study was to compare fundus autofluores-cence (FAF) luminosity changes of laser photocoagulation scars between the conventional laser (0.2 sec) and the short-pulse laser (0.02 sec) for diabetic retinopathy. To evaluation FAF, individual gray-scale values of the laser scars adjacent to the retinal arcade vessels were recorded, then, the mean gray values of the scars were divided by the luminosity of arcade vein.The scars with short-pulse laser showed slower hypo-fluorescence progression compared to those with conventional laser. The findings suggest that the short-pulse laser exhibited a slower progression of hypo-FAF, indicating a more delayed response in improving retinal ischemia following short-pulse laser PRP.

Academic Significance and Societal Importance of the Research Achievements

ショートパルスレーザーは、痛みが少なく短時間に治療が可能であるが、虚血改善効果が遅いことが示唆される。糖尿病網膜症をはじめとした虚血性網膜疾患に対して、レーザー光凝固治療が重要であるが、ショートパルスレーザーを用いる場合は、血管内皮増殖因子阻害薬との併用などにより、虚血改善効果が遅いことを補填し、痛みが少なく、より患者に負担のない治療法を考えるべきであろう。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (7 results)

All 2024 2023 2022 2021

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

  • [Journal Article] Quantitative Evaluation of Fundus Autofluorescence in Laser Photocoagulation Scars for Diabetic Retinopathy: Conventional vs. Short-Pulse Laser2023

    • Author(s)
      Kimura Toshiya、Ogura Shuntaro、Yasukawa Tsutomu、Nozaki Miho
    • Journal Title

      Life

      Volume: 13 Issue: 9 Pages: 1901-1901

    • DOI

      10.3390/life13091901

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Role of Laser Photocoagulation in Treating Diabetic Macular Edema in the Era of Intravitreal Drug Administration: A Descriptive Review2023

    • Author(s)
      Nozaki Miho、Ando Ryota、Kimura Toshiya、Kato Fusae、Yasukawa Tsutomu
    • Journal Title

      Medicina

      Volume: 59 Issue: 7 Pages: 1319-1319

    • DOI

      10.3390/medicina59071319

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Quantitative Evaluation of Fundus Autofluorescence in Laser Photocoagulation Scars for Diabetic Retinopathy: Conventional vs. Short-Pulse Laser2024

    • Author(s)
      Miho Nozaki
    • Organizer
      FUJI retina 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 眼底自発蛍光を用いた 糖尿病網膜症に対する光凝固瘢痕の評価―凝固条件による違い―2022

    • Author(s)
      木村俊哉、小椋俊太郎、野崎実穂、安川力
    • Organizer
      第28回日本糖尿病眼学会総会
    • Related Report
      2022 Research-status Report
  • [Presentation] Quantitative Evaluation of Fundus Autofluorescence in Laser Photocoagulation Scars for Diabetic Retinopathy2022

    • Author(s)
      Toshiya Kimura, Shuntaro Ogura, Miho Nozaki, Tsutomu Yasukawa
    • Organizer
      FUJIRETINA
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 抗VEGF治療時代の糖尿病黄斑浮腫の補助療法 レーザー光凝固2022

    • Author(s)
      野崎実穂
    • Organizer
      第28回日本糖尿病眼学会総会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Less expansion of short-pulse laser scars in panretinal photocoagulation for diabetic retinopathy -long term comparison using FAF-2021

    • Author(s)
      野崎 実穂
    • Organizer
      8th International Symposium of Asia Pacific Retinal Imaging Society (APRIS)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2020-04-28   Modified: 2025-01-30  

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