強大音響暴露後に出現した方向交代性上向性頭位眼振の一症例 Case Report on the Apogeotropic Direction Changing Type of Positional Nystagmus Following Acoustic Trauma

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A 56-year-old man complained of a hearing loss and tinnitus in his right ear after short intense exposure to a high level of sound. Although he had no complaints of vertigo or dizziness, his neuro-otological examination revealed apogeotropic direction changing type of positional nystagmus. An audiogram showed right high-frequency sensorineural hearing loss. An eye tracking test (ETT) and an optokinetic nystagmus (OKN) test showed no abnormalities. A caloric test showed normal responses in both ear sides. One week after the exposure to a high level of sound, the positional nystagmus completely disappeared.<BR>Apogeotropic direction changing type of positional nystagmus is generally considered to be a phenomenon observed in patients with central vestibular lesion. However, physical examination and laboratory tests of this patient suggested that he suffered from only a peripheral vestibular impairment. From these results, apogeotropic direction changing type of positional nystagmus observed in this patient resulted from an impair-ment of the peripheral vestibular system.

収録刊行物

  • Equilibrium research

    Equilibrium research 58(4), 311-316, 1999-08-01

    Japan Society for Equilibrium Research

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各種コード

  • NII論文ID(NAID)
    10008712843
  • NII書誌ID(NCID)
    AN00001485
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03855716
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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