Infants versus older children fitted with cochlear implants: performance over 10 years

Area of Science:

• Pediatric audiology
• Neuroscience of hearing
• Speech-language pathology

Background:

• Cochlear implants (CIs) offer auditory restoration for severe to profound hearing loss.
• The timing of CI implantation is a critical factor influencing developmental outcomes.
• Understanding the long-term effects of early versus later implantation is crucial for clinical practice.

Purpose of the Study:

• To compare the efficacy of cochlear implants (CIs) in infants versus children implanted at later ages.
• To assess the impact of implantation age on spoken language skills and cognitive performance.
• To evaluate auditory abilities up to 10 years post-implantation.

Main Methods:

• Prospective cohort study of 19 infants (implanted 2-11 months) compared to older children.
• Auditory skills assessed using Category of Auditory Performance (CAP), Infant-Toddler Meaningful Auditory Integration Scale (IT-MAIS), Peabody Picture Vocabulary Test (PPVT-R), Test of Reception of Grammar (TROG), and Speech Intelligibility Rating (SIR).
• Cognitive function evaluated with Griffiths Mental Development Scale (GMDS) and Leiter International Performance Scale-Revised (LIPS-R).

Main Results:

• Infants showed significantly better CAP scores than older groups up to 36 months post-surgery.
• Infant PPVT-R outcomes were comparable to normal-hearing children; older groups did not reach normal levels.
• Infants demonstrated significantly better grammar development (TROG) at 5 and 10 years.
• Youngest CI recipients achieved higher scores on complex cognitive subtests (GMDS, LIPS-R).

Conclusions:

• Cochlear implantation before 12 months of age leads to superior auditory, speech-language, and cognitive outcomes.
• Early intervention with CIs maximizes developmental potential in children with hearing loss.
• Delayed implantation is associated with persistent deficits in language and cognitive skills.