Comparison of Acute Low-Tone Sensorineural Hearing Loss versus Meniere's Disease by Electrocochleography
To clarify the pathogenesis of acute low-tone sensorineural hearing loss (ALHL), we retrospectively compared the electrocochleographic findings from 20 patients with ALHL with those from 58 patients with Meniere's disease (MD) classified into 4 groups (MD1 through MD4) according to their pure t...
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Veröffentlicht in: | Annals of otology, rhinology & laryngology rhinology & laryngology, 2004-03, Vol.113 (3), p.194-199 |
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Zusammenfassung: | To clarify the pathogenesis of acute low-tone sensorineural hearing loss (ALHL), we retrospectively compared the electrocochleographic findings from 20 patients with ALHL with those from 58 patients with Meniere's disease (MD) classified into 4 groups (MD1 through MD4) according to their pure tone average. The mean summating potential-action potential ratio in the ALHL group was 0.35 ± 0.13, which was significantly higher than the control ratio but similar to the ratio seen in the MD1 group (pure tone average < 25 dB hearing level). The mean detection threshold of the cochlear microphonics in the ALHL group was 32.0 ± 9.4 dB normal hearing level, which was again similar to that seen in the MD1 group. Moreover, more than 50% of patients with ALHL had normal cochlear microphonics input-output curves. We therefore conclude that the pathogenesis of ALHL arises from an endolymphatic hydrops with little or no impairment of hair cells that resembles early-stage MD. |
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ISSN: | 0003-4894 1943-572X |
DOI: | 10.1177/000348940411300304 |