人工内耳装用児と補聴器装用児における語音聴取能の比較検討

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  • Comparison of speech perception in children with cochlear implants and hearing aids

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The aim of this study was to identify the indications, specifically the hearing levels, for cochlear implants. Twenty-five children with profound sensorineural hearing impairments and cochlear implants (6 to 11 years old, prelingual hearing loss) and 61 children with mild to profound hearing impairments and hearing aids (6 to 17 years old, prelingual or perilingual hearing loss) for a long term (more than three years) were evaluated. Their speech perception abilities were evaluated using our original speech perception tests, and questionnaires were distributed to their parents at home. As a result, the speech perception ability of cochlear implantees with only a single hearing loss disability was equivalent to that of hearing-aid users with a mean hearing level (0.5, 1, 2 and 4kHz) of 70 to 79dB (HL). Therefore, children with a hearing level of 90dB or more were considered to be candidates for cochlear implantation. Since the mean aided-hearing levels of hearing aid users at the 70dB and 90dB levels were 41dB and 53dB, respectively, children with a mean aided-hearing level of more than 50dB after hearing aid adjustments should also be considered candidates for cochlear implantation.

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