Pediatric cochlear implantation in auditory neuropathy.

Area of Science:

• Pediatric Audiology
• Neuroscience
• Otolaryngology

Background:

• Auditory neuropathy (AN) presents with hearing loss, abnormal auditory brainstem responses, and normal otoacoustic emissions.
• The presumed lesion site proximal to the cochlea historically suggested limited benefit from cochlear implantation.
• Emerging evidence indicates cochlear implantation can be beneficial for AN patients.

Purpose of the Study:

• To review the performance of children diagnosed with auditory neuropathy who underwent cochlear implantation.
• To explore the efficacy of cochlear implantation in managing auditory neuropathy.

Main Methods:

• Retrospective case review of patients diagnosed with AN between 1993 and 2001.
• Data collected from a tertiary pediatric referral center and the Center for Hearing and Deafness Research.
• Analysis focused on auditory and verbal development outcomes post-implantation.

Main Results:

• Eighteen pediatric patients diagnosed with AN were identified, with a majority experiencing severe to profound hearing loss.
• Four patients received cochlear implants within the 5 years preceding the review.
• All implanted children demonstrated variable improvements in auditory and verbal development.

Conclusions:

• Successful cochlear implantation in AN patients suggests the auditory system lesion can be overcome by direct electrical stimulation.
• Findings imply that pathologies at the inner hair cell or inner hair cell-cochlear nerve junction may be implicated in AN.
• Cochlear implantation offers a viable therapeutic option for select children with auditory neuropathy.