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Experimental Study on Hearing Impairment in Acoustic Neuromas

Research Project

Project/Area Number 63480385
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Otorhinolaryngology
Research InstitutionKeio University

Principal Investigator

KANZAKI Jin  Keio University School of Medicine, Professor, 医学部・耳鼻咽喉科, 教授 (00051441)

Co-Investigator(Kenkyū-buntansha) OGAWA Shigeo  Keio University School of Medicine, Instructor, 医学部・耳鼻咽喉科, 助手 (10177131)
KUNIHIRO Takanobu  Keio University School of Medicine, Instructor, 医学部・耳鼻咽喉科, 助手 (10170010)
OGAWA Kaoru  Keio University School of Medicine, Instructor, 医学部・耳鼻咽喉科, 助手 (00169179)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1990: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1989: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1988: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsAcoustic Neuroma / Hearing Impairmet / Hypoxia / Cochlear Blood Flow / Steroid Hormone / Hypothermia / フマル酸プロビンカミン / ニセルゴリン / 聴力保存手術
Research Abstract

The relationship between cochlear blood flow (CBF) and cochlear electrical activity was investigated to better understand cochlear circulatory insufficiency, which is considered to be a cause of hearing loss acoustic neuroma.
1. Experimental animal models for cochlear circulatory insufficiency
Experimental animal models for cochlear circulatory insufficiency were made by asphyxia, NO2 anoxia and obstruction of AICA.
Changes in systemic blood pressure (BP) during asphyxia and NO2 anoxia were clearly associated with changes in CBF. At the initial stage of asphyxia, however, CBF did not change in spite of the decrease in BP. These discrepancies appeared to be related to autoregulation of CBF. There was no difference in the change in compound action potential of the eighth nerve (AP) between asphyxia and NO2 anoxia.
Data from the experiment using AICA obstruction were insufficient to provide information on changes in AP as CBF decreased. However, the data indicated that the higher the CBF reduction rate, the higher the disappearing rate of AP.
2. Effects of steroid hormone and hypothermia on cochlear circulatory insufficiency
Although changes in CBF following systemic administration of steroid hormone were not clearly observed, the recovery time of N1 (AP) latency became shorter with systemic administration of steroid hormone. Similar results were obtained with hypothermia. Based on the analysis of these results, we concluded that the reversibility of the cochlear activity in cochlear circulatory insufficiency could be improved by the administration of steroid and hypothermia.

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 小川 茂雄他: "蝸牛血流に対するステロイドの影響" Ear Res Jpn. 20. 319-320 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 小川 郁他: "asphyxiaによる蝸牛血流の変化ー頂回転、基低回転の変化についてー" Ear Res Jpn. 20. 321-322 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kanzaki J et al: "Hearing Presention in aoovstic newoma scogery and preoperative audiological findings" Acta Ohlaryngol(Stockh). 107. 474-479 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 神崎 仁: "聴神経腫瘍の外科的治療" 耳鼻展. 33. 201-528 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Ogawa S et al: "Effects of steroid hormone on cochlear blood flow." Ear Res Jpn. 20. 319-320 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Ogawa K et al: "Effect of asphyxia on cochlear blood flow comparison between in apical turn and basal turn-." Ear Res Jpn. 20. 321-322 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kanzaki J et al: "Hearing preservation in acoustic neuroma surgery and preoperative audiological findings." Acta Otolaryngol (Stock). 107. 474-479 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kanzaki J et al: "Surgical management of acoustic neuromas." ORL Tokyo. 33. 201-528 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 神崎 仁: "聴神経腫瘍の外科的治療" 耳鼻咽喉科展望. 33. 201-528 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 神崎仁: "聴神経腫瘍の外科的治療に関する研究" 耳鼻咽喉科展望.

    • Related Report
      1989 Annual Research Report
  • [Publications] 小川郁: Ear Research Japan.

    • Related Report
      1988 Annual Research Report
  • [Publications] 小川茂雄: Ear Research Japan.

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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