Speech perception after cochlear implantation over a 4-year time period.

Abstract:

OBJECTIVE:To evaluate the long-term speech perception of cochlear implantees and to compare the developing auditory performance patterns of prelingual children and postlingual deaf adults. MATERIAL AND METHODS:Twenty-nine prelingually deaf children and 17 postlingually deaf adults who had been followed up for 4 years were included in the study. Speech perception ability was assessed by means of vowel and consonant confusion tests and the Korean version of the Central Institute of Deafness (K-CID) test (performed without visual cues). The test results were analyzed at 3 and 6 months after implantation and then annually. RESULTS:In the prelingually deaf children, the average results continuously improved over the 4-year period. In the postlingually deaf adults, the average results did not improve further after the first 2 years. Individuals with < 5 years of deafness had a faster rate of recovery of speech perception than those who had been deaf for > 5 years. The K-CID scores were negatively correlated with age at implantation for the prelingually deaf group and with the duration of deafness in the postlingually deaf group. Children fitted with implants at a younger age showed better speech perception ability than those fitted with implants at an older age. Interestingly, prelingually deaf children aged 5-7 years at implantation showed the widest variation in individual outcomes. Amongst this group of children with highly variable outcomes, the metabolic status of brain cortices determined by means of 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) was available for three patients. The individual with the widest hypometabolic area had the best speech perception ability. CONCLUSION:The extent of hypometabolism as assessed by FDG-PET seemed to be one of the major factors predicting the outcome of cochlear implantation.

journal_name

Acta Otolaryngol

journal_title

Acta oto-laryngologica

authors

Oh SH,Kim CS,Kang EJ,Lee DS,Lee HJ,Chang SO,Ahn SH,Hwang CH,Park HJ,Koo JW

doi

10.1080/0036554021000028111

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

148-53

issue

2

eissn

0001-6489

issn

1651-2251

journal_volume

123

pub_type

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