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Experimental and clinical studies on electrocochleographic evaluation of endolymphatic hydrops

Research Project

Project/Area Number 05671435
Research Category

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

Allocation TypeSingle-year Grants
Research Field Otorhinolaryngology
Research InstitutionMiyazaki Medical College

Principal Investigator

TONO Tetsuya  Miyazaki Medical College, Associate Professor, 医学部, 助教授 (80145424)

Co-Investigator(Kenkyū-buntansha) USHISAKO Yasuaki  Miyazaki Medical College, Research Associate, 医学部, 助手 (10185001)
UEKI Yoshihiro  Miyazaki Medical College, Research Associate, 医学部, 助手 (10229411)
植木 義裕  宮崎医科大学, 医学部, 助手 (90232735)
定永 正之  宮崎医科大学, 医学部, 助手 (70271137)
宮永 敏  宮崎医科大学, 医学部, 助手 (60200193)
笠野 藤彦  宮崎医科大学, 医学部, 助手 (30169403)
松浦 宏司  宮崎医科大学, 医学部, 助手 (50173795)
春田 厚  宮崎医科大学, 医学部, 助手 (90201722)
Project Period (FY) 1993 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1994: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordssensorineural hearing loss / Meniere's disease / endolymphatic hydrops / electrocochleography / action potential / summating potential / low-frequency bias / click polarity
Research Abstract

Electrocochleographic indicators potentially available for the evaluation of endolymphatic hydrops (ELH) were studied using experimental animals and clinical materials.
Although the enlarged summating potential (SP)/action potential (AP) ratio has been known to be frequently associated with Meniere's disease, this abnormality was found not only in ELH but also in some other inner ear pathological models such as the strial damage due to furosemide. Since the guinea pig ELH model showed a significant decrease in the degree of low-frequency modulation of AP amplitude and the tendency of increase in the AP-latency difference between rarefaction and condensation clicks, these two parameters seemed to be more sensitive indicators for ELH than any other clinically available parameters.
In order to evaluate new electrocochleographic parameters not only in patients with sensorineural hearing loss but also in normal-hearing subjects, we have developed a special electrode designed for tympanic electrocochleography. This method is found to be more convenient and less traumatic than recording with a transtympanic or an ear-canal electrodes, even allowing repeated measurements during the glycerol dehydration test. The abnormal increase in the AP-latency difference to condensation and rarefaction clicks was found in patients with high-frequency hearing・loss as well as in those with acute low-tone sensorineural hearing loss and with threshold fluctuation.
Further studies are needed in a larger number of clinical cases before concluding whether such AP-latency difference is caused by ELH.Improvements must also be made on better recording of the low-frequency cochlear microphonics using tympanic electrocochleography.

Report

(4 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • 1993 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] Tetsuya Tono: "Cochlear implantation in an intralabyrinthine acoustic neuroma patient after vesection of an intracanalicular tumor." Journal of Laryngology and Otology (Ashford). 110. 570-573 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 松浦 宏司: "使い捨て鼓膜電極を用いた蝸電図検査法に関する研究" 日本耳鼻咽喉科学会会報. 99. 1016-1025 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 植木 義裕: "低音域障害型感音難聴の鼓膜蝸電図所見" 耳鼻と臨床. 42補2. 747-751 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 原 由紀代: "AsphyxiaおよびFurosemideによるモルモット蝸牛窓電位の変化" 耳鼻と臨床. 42補2. 687-692 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 松浦 宏司: "グリセロールテストおよび術中聴覚モニタリングにおける鼓膜蝸電図の有用性" 耳鼻と臨床. 42補2. 737-746 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 加藤 榮司: "剣道による感音難聴と2kHz障害型オ-ジオグラムの検討" 耳鼻と臨床. 42補2. 761-765 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Tono, T., Morizono, T: "Low-frequency biasing of round window responses in guinea pigs and chinchillas." Audiology(Basel). 34. 47-56 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Haruta, A., Tono, T., Morimitsu, T: "Effects of experimental round window membrane laceration on the free amino acid profile of perilymph." Acta Otolaryngology(Stockh). 115. 504-508 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Shimozono, M., Tono, T., Morimitsu, T., Nakagawa, T., Komune, S: "Measurement of intracellular free Ca2+ concentration in guinea pig spiral ganglion cells." Neuro Report(London). 6. 421-424 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Tono, T., Haruta, A., Matsuura, K., Morizono, T: "Effect of experimental perilymphatic fistula on cochlear function in guinea pigs and chinchillas." Otology Japan. 5. 5-10 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hara, Y., Tono, T., Ushisako, Y., Yamasaki, M., Morimitsu, T: "Changes in the cochlear potentials induced by asphyxia and furosemide." Otologia Fukuoka. 42 suppl.2. 687-692 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Matsuura, K., Tono, T., Ushisako, Y., Ueki, Y., Morimitsu, T: "Tympanic electrocochleography for the glycerol dehydration test and intraoperative monitoring." Otologia Fukuoka. 42 suppl.2. 737-746 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ueki, Y., Tono, T., Matsuura, K., Morimitsu, T: "A tympanic electrocochleographic study of low-tone sensorineural hearing loss." Otologia Fukuoka. 42 suppl.2. 747-751 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Matsuura, K., Tono, T., Hara, Y., Ushisako, Y., Ueki, Y., Morimitsu, T: "Tympanic electrocochleography with disposable electrode" Journal of Otolaryngology of Japan. 99. 1016-1025 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 東野哲也: "実験的外リンパ瘻による蝸牛障害の種差について" Otology Japan. 5. 5-10 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] ATSUSHI HARUTA: "Effects of experimental round window laceration on the free a mino acid profile of perilymph" Acta Otolaryngology(Stockh). 115. 504-508 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] TETSUYA TONO: "Low-frequency biasing of round window responsinguinea pigs and chinchillas" Audiology. 34. 47-56 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 東野哲也: "極性別クリック反応波形からみた蝸電図の‘SP'異常の機序" Audiology Japan. 38. 561-562 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 植木義裕: "低音障害を伴う感音難聴の蝸電図所見" Audiology Japan. 38. 573-574 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 松浦宏司: "極性別Click刺激による鼓膜蝸電図" AUDIOLOGY JAPAN. 37. 669-670 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 東野哲也: "実験的外リンパ瘻による蝸牛障害の種差について" Otol Jpn. 5(予定). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 植木義裕: "血管拡張剤蝸牛窓投与時の蝸牛血流の変化" Otol Jpn. 4. 247-252 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Atsushi Haruta: "Effects of experimental round window membrane Laceration on the free amino acid profile of perilymph" Acta Otolaryngol(Stockh). 115(予定). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Tetsuya Tono: "Low-frequency biasing of round window responses in guinea pigs and chinchillas" Audiology. 974(予定). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 東野,哲也: "酢酸局所投与後の蝸牛電位への影響" AUDIOLOGY JAPAN. 36. 519-520 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 松浦,宏司: "鼓膜電極を用いた蝸電図検査" AUDIOLOGY JAPAN. 36. 675-676 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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