低音障害型感音難聴の検討

DOI 被引用文献8件

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  • Analysis on So-called Low Tone Sensorineural Hearing Loss.

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In order to establish the diagnostic criteria of so-called low tone sensorineural hearing loss, weinvestigated the relationship between prognosis of hearing loss and various clinical factors in 76 cases ofunilateral sensorineural hearing loss which satisfied the following 4 conditions such as (1) no known etiologywas found, (2) the hearing loss appeared rapidly and the initial hearing test was conducted within 2 week safter the onset of hearing loss, (3) the averaged hearing level was more than 30 dB between 125Hz and 500Hz, and (4) no vertigo or dizziness was noticed.<BR>All subjects were classified into 4 groups based upon prognosis of hearing loss as follows;<BR>a) complete recovery with a single attack of hearing loss (CRS).<BR>b) no recovery with a single attack of hearing loss (NRS).<BR>c) complete recovery with recurrent attacks of hearing loss (CRR).<BR>d) no recovery with recurrent attacks of hearing loss (NRR).The results obtained were as follows;<BR>1) The single attack of hearing loss was found in57cases out of76 (75.0%) and recurrent attacks in 19 cases (25.0%).<BR>2) CRS was found in 50 cases (65.8%), NRS in 7 cases (9.2%), CRR in 10 cases (13.2%) and NRR in 9 cases (11.8%).<BR>3) When the relationship between prognosis of hearing loss and the age at the onset of hearing loss wasanalyzed, the mean age at the onset of hearing loss in NRS was higher than others.<BR>4) When the relationship between prognosis of hearing loss and the time lag between the onset of hearingloss and first visit was analyzed, the mean time lag in CRS was shorter than others.<BR>5) When the relationship between prognosis of hearing loss and the averaged pure-tone audiogram ofaffected ears at initial test was analyzed, the hearing level in NRS was higher than others in allfrequency areas.<BR>6) When the relationship between prognosis of hearing loss and the time course of hearing level in earlystage after the onset of hearing loss was analyzed, a rapid recovery was found in most cases of CRS, however the recurrent attacks of hearing loss within relatively short term was noticed in some cases of CRR and NRR, which suggested the different pathophysiology of hearing loss in individual groups.<BR>7) When the relationship between prognosis of hearing loss and the hearing level at high frequency areawas analyzed, the incidence in CRS and CRR decreased and that in NRS increased in the cases with more than 20dB of averaged hearing level between 2kHz and 8kHz compared with those of less than 20dB.<BR>8) Based upon these results, it was concluded that prognosis of hearing loss in so-called low tonesensorineural hearing loss could be influenced by various clinical factors and it was also suggested thatthe results obtained in this study could give us useful informations to establish the clinical diagnosticcriteria of so-called low tone sensorineural hearing loss in the future.

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