Long term outcomes of early cochlear implantation in Korea.
OBJECTIVE
The objective of this study was to compare the long-term auditory performance and language skill depending on the age of cochlear implantation in the Korean population. We especially tried to separate the effect of maturation/development from that of the age at implantation.


METHODS
Eighty-six pre-lingual children with profound hearing loss who underwent a cochlear implantation before the age of six and had been followed for more than 3 yr were included in this study prospectively. Categories of Auditory Performance (CAP) and Korean Picture Vocabulary Test (K-PVT) were serially followed up. In order to separate the age at implantation effect, K-PVT results were readjusted to the child's chronological age in the normal hearing population.


RESULTS
When the CAP and K-PVT scores were directly compared without chronological readjustment, we failed to show a significant difference for improvements according to the age at implantation. Early cochlear implantation was associated with better language development, only when the K-PVT scores were readjusted to percentile scores of their chronological age.


CONCLUSIONS
Early cochlear implantation was associated with better language development even within the critical period. This advantage may be recognized only when the effect of the age at implantation is separated from the effect of maturation/development.
Department of Otolaryngology-Head and Neck Surgery, Dankook University, College of Medicine, Cheonan, Korea.
Myung-Whan
MW
Suh
Eung Kyung
EK
Cho
Bong Jik
BJ
Kim
Sun O
SO
Chang
Chong Sun
CS
Kim
Seung-Ha
SH
Oh