Long-Term Observation of Idiopathic Bilateral Sensorineural Hearing Loss.

概要

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Long-term observation is necessary to evaluate the clinical course of idiopathic bilateral sensorineural hearing loss (IBSHL). We followed 16 patients with 7 males and 9 females IBSHL for five years or more. The ages at the beginning of observation ranged from 8 to 67 years. None had familial hearing loss.In nine patients hearing loss progressed in both ears, and in seven hearing loss become worse in only one ear. However, all ears had severe hearing loss. At the beginning of observation various degrees of hearing loss were recorded, but in many cases hearing loss of both ears was severe at the latest observation. Hearing loss of higher tones tended to be more progressive than that of lower tones.As hearing loss became more profound, the speed of progression decreased. It was considered that the progression of hearing loss might be even slower if the term of observation were longer. Hearing level and length of observation are important in the evaluation of the rate of progress of hearing loss.
耳鼻咽喉科臨床学会の論文