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https://doi.org/10.5631/jibirin.90.1085
Copy DOIJournal: Practica Oto-Rhino-Laryngologica | Publication Date: Jan 1, 1997 |
A patient with bilateral sensorineural hearing loss on a pure tone audiogram (PTA), associated with unilateral (right side) cerebral infarction in the auditory cortex is described. The PTA on the left (contralateral) side initially showed a “scale out”. The PTA threshold improved rapidly, and finally returned to almost normal levels within 2 months. The PTA on the right side initially showed mild sensorineural hearing loss. The PTA threshold gradually returned to normal levels within 2-3 months. In contrast to the rapid recovery of the PTA threshold, the maximum speech perception ability on the left side showed a very low score during the follow-up period of 2 years, and showed little improvement. The maximum speech perception ability on the right side maintained a high score from the time of first examination. All of the objective auditory examinations, including the auditory brainstem response (ABR), oto-acoustic emission (OAE), electrocochleogram (ECoG), middle latency response (MLR), and slow vertex response (SVR), indicated that hearing loss on the left (contralateral) side was closely associated with unilateral (right side) cerebral infarction of the auditory cortex. These results suggest that sensorinueral hearing loss on the PTA could be detected at the early stages of onset, even after unilateral damage to the auditory cortex.
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