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Distortion Product Otoacoustic Emissions in Acute Sensorineural Hearing Loss.

Research Project

Project/Area Number 07671850
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Otorhinolaryngology
Research InstitutionNAGOYA UNIVERSITY

Principal Investigator

UEDA Hiromi  Nagoya University School of Medicine, Associate Professor, 医学部, 講師 (20213358)

Co-Investigator(Kenkyū-buntansha) HATTORI Taku  Nagoya University School of Medicine, Associate Professor, 医学部, 講師 (10172933)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsAcute sensorineural hearing loss / Sudden deafness / Distortion product otoacoustic emission / DPOAE
Research Abstract

Time course of acute sensorineural hearing loss cases mainly on sudden deafness (SD) with horizontal type audiograms was evaluated by means of pure tone audiometry (PTA) and Distortion product otoacoustic emissions (DPOAEs) together with Evoked otoacoustic emissions (EOAEs).
As the PTA levels recovered, DP power in each frequency also improved to almost the same level as that of the healthy side with good correlation in the full and remarkable recovery groups. 1kHz DP power exclusively had good correlation to 1kHz PTA level than in other frequencies through the time course.
In 6 cases which could be evaluated every DP frequencies, correlation coefficient value at 1,2 and 4kHz was calculated as high as 0.856,0.731 and 0.613 respectively. The value tended to be high in lower frequency. The inner ear function could be evaluated in frequency domain in some extent. However, DP power fulctuated day to day resulting in difficulty of evaluating the inner ear function at that instance.
On the other hand, total echo power (TEP) of EOAEs showed excellently high correlation coefficient value to mean PTA level (quadratic method) of 0.952.
No case was observed in which DPOAE had improved prior to the PTA level. It is difficult to predict the prognosis only with the result of DPOAE at that instant.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 服部 琢: "DPOAEによる急性感音難聴の経過観察" Audiology Japan. 39. 541-542 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] TAKU HATTORI: "Distortion Product Otoacoustic Emissions in Acute Sensorineural Hearing Loss." Vol.39No.5. 541-542 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] TAKU HATTORI: "Distortion Product Otoacoustic Emissions in Acute Sensorineural Hearing Loss." Vol.39No.5. 541-542 (1996)udiology Japan.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 服部 琢: "DPOAEによる急性感音難聴の経過観察" Audiology Japan. 39.5. 541-542 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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