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Speech perception after cochlear implantation over a 4-year time period
Seung-Ha Oh1, Chong-Sun Kim, Eun Joo Kang
1Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, South Korea.
Acta Oto-Laryngologica
|April 19, 2003
Summary
Cochlear implantation outcomes vary, with prelingual children showing continuous improvement and postlingual adults stabilizing after two years. Brain metabolism, assessed by 18F-fluorodeoxyglucose positron emission tomography (FDG-PET), appears to predict speech perception success.
Area of Science:
- Otolaryngology and Neuroscience
- Auditory Rehabilitation and Neuroimaging
Background:
- Cochlear implantation is a vital intervention for profound hearing loss.
- Understanding long-term speech perception development is crucial for optimizing outcomes in pediatric and adult cochlear implant users.
Purpose of the Study:
- To evaluate long-term speech perception in cochlear implant recipients.
- To compare auditory performance trajectories between prelingual children and postlingual adults.
Main Methods:
- Longitudinal study of 29 prelingual children and 17 postlingual adults over 4 years.
- Speech perception assessed using vowel/consonant confusion tests and the Korean version of the Central Institute of Deafness (K-CID) test.
- Analysis of results at 3, 6 months, and annually post-implantation; 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) used in a subset of children.
Main Results:
- Prelingual children demonstrated continuous speech perception improvement over 4 years.
- Postlingual adults showed stabilization of speech perception after 2 years.
- Shorter duration of deafness (<5 years) correlated with faster speech perception recovery; younger age at implantation and reduced brain hypometabolism (via FDG-PET) predicted better outcomes.
Conclusions:
- Brain cortical metabolism, visualized by FDG-PET, is a significant predictor of cochlear implant success.
- Age at implantation and duration of deafness influence long-term auditory rehabilitation outcomes.