Audiological findings of prolonged Menière's disease.

As Ménière's disease progresses, the fluctuations becomes less marked and the hearing level gradually declines. In the more established and advanced stages of the disease, a permanent and progressive hearing loss develops. It has been reported, however, that hearing acuity in some patients with Ménière's disease significantly improved after having had the disorder for many years. Such observation suggests that the inner ear pathology in late stages of Ménière's disease may not be necessarily irreversible. The purpose of this investigation was to assess whether or not various audiological evaluations including EcochG may be of value in predicting the irreversibility of hearing deficit in patients suffering from advanced stages of Ménière's disease. The audiological studies included pure tone audiogram, SISI test, Bekesy audiometry, glycerol (or urea) test, speech discrimination test, and electrocochleography. A combination of the recruiting type of response in the EcochG and the narrowing of the tracing width of continuous sound in the Bekesy pattern seemed to be indicative for irreversible hair cell damages. Patients who had a low score in the speech discrimination test as well as an absence of ABR response were suspected of having retrocochlear lesions. Our investigations suggest that the irreversibility of hearing impairment in patients with later stages of Ménière's disease may be predicted to some extent in the use of various audiological evaluations including the EcochG.