Cochlear implantation in children with cochlear nerve deficiency

Area of Science:

• Otolaryngology
• Pediatric Audiology
• Neurosurgery

Background:

• Cochlear nerve deficiency (CND) presents a unique challenge for cochlear implantation (CI) in children with profound sensorineural hearing loss.
• Understanding auditory performance post-CI in this specific population is crucial for managing expectations and optimizing outcomes.

Purpose of the Study:

• To evaluate the auditory performance and speech development in children with CND following cochlear implantation.
• To assess the variability of outcomes and identify factors influencing benefit.

Main Methods:

• Retrospective case review of five pediatric patients with pre-lingual profound sensorineural hearing loss and CND who underwent cochlear implantation.
• Auditory and speech performance assessed using standardized metrics including warble tone average thresholds, speech perception categories, and intelligibility ratings.
• High-resolution computed tomography (HRCT) and magnetic resonance imaging (MRI) were utilized for anatomical evaluation.

Main Results:

• Three patients had Govaerts type IIb and two had type IIa CND.
• All patients demonstrated improved hearing thresholds with CI.
• Only one patient achieved open-set speech perception and spoken language acquisition; another developed closed-set perception. The remaining three showed limited benefit, primarily improved environmental sound awareness and lipreading skills.

Conclusions:

• Cochlear implantation outcomes in children with CND are highly variable, with a spectrum from significant speech development to improved environmental sound access.
• Despite variable results, all patients utilized their devices daily, deriving functional benefits.
• CI can be a viable option for children with CND, but thorough family counseling regarding potential restricted benefits is essential.