Objectives: This study aimed to investigate a wide variety of factors that influence auditory, speech, and language development following pediatric cochlear implantation (CI).
Study design:Prospective collection of language tested data in profound hearing-impaired children.Hypothesis: Pediatric CI can potentially be effective to development of practical communication skills and early implantation is more effective.
Methods:We proposed a set of language tests (assessment package of the language development for Japanese hearing-impaired children; ALADJIN) were CI-hearing aid (HA) users, and 2 (1.1%) were bilateral CI users.Hearing loss level of CI users was significantly (p < 0.01) worse than that of HA-only users. However, the threshold level, maximum speech discrimination score, and speech intelligibility rating in CI users were significantly (p < 0.01) better than those in HA-only users. The scores for PVT-R (p < 0.01), SCTAW, and WFT in CI users were better than those in HA-only users. STA and TQAID scores in CI-HA users were significantly (p < 0.05) better than those in unilateral CI-only users. The high correlation (r=0.52) has been found between the age of CI and maximum speech discrimination score. The scores of speech and language tests in the implanted children before 24 months of age have been better than those in the implanted children after 24 months of age.
Conclusions:We could indicate that CI was effective for language 5 development in Japanese hearing-impaired children and early CI was more effective for productive vocabulary and syntax.6