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12-month post-operative results for older children using sequential bilateral implants.
Karyn Louise Galvin1, Mansze Mok, Richard C Dowell
1Department of Otolaryngology, The University of Melbourne, East Melbourne, VIC, Australia. kgalvin@unimelb.edu.au
Ear and Hearing
|May 15, 2007
Summary
Bilateral cochlear implants offer varied functional benefits for children, with some experiencing significant improvements. However, no enhanced sound localization was observed, and benefits may stem from the head shadow effect.
Area of Science:
- Audiology
- Neuroscience
- Pediatric Medicine
Background:
- Bilateral cochlear implantation is increasingly used in children.
- Understanding the functional benefits of a second cochlear implant is crucial for pediatric audiology.
- Previous research shows mixed results regarding benefits beyond improved hearing thresholds.
Purpose of the Study:
- To investigate the perceptual and functional benefits of a second cochlear implant in children.
- To assess outcomes such as sound localization and speech discrimination in noise.
- To identify factors correlating with successful outcomes in pediatric bilateral cochlear implant users.
Main Methods:
- A cohort of six children (aged 5-15 years) received a second cochlear implant.
- Parental reports on functional performance were collected.
- Objective measures included sound localization and spondee discrimination in noise.
Main Results:
- Outcomes ranged from no benefit to significant functional improvement.
- No improvement in sound localization ability was demonstrated.
- Observed benefits were largely attributed to the head shadow effect, not improved binaural hearing.
- Success did not correlate with hearing aid use, age, time between implants, or prior experience with a single implant.
Conclusions:
- Bilateral cochlear implantation in children yields variable functional benefits.
- The primary advantage may be related to the head shadow effect rather than enhanced binaural processing.
- Further research is needed to optimize outcomes and identify predictors of success for pediatric bilateral cochlear implant users.