Abstract
Introduction There are very few studies comparing speech perception abilities of children using
bimodal hearing over monaural cochlear implant and factors related to benefit of bimodal
hearing. The aim of this study is to compare speech perception abilities of children
using bimodal fitting versus children using cochlear implant alone and explore factors
related to benefit of bimodal hearing.
Materials and Methods In the present study, 20 cochlear implantees with the hearing age range of 3 to 8
years were included. Speech perception performance was assessed by means of Parent’s
Evaluation of Aural/Oral Performance of Children scale and early speech perception
(ESP) test: Pattern Perception Words, Monosyllabic Words, Bisyllabic, and Trisyllabic
Words Identification test. ESP test was carried out in two conditions cochlear implant
with hearing aid in opposite ear (CIHA), bimodal, and cochlear implant (CI) alone.
Aided audiometry was also carried out in above mentioned two conditions.
Results and Discussion On aided audiometry test, aided thresholds were improved by 5 to 6 dB in CIHA condition
as compared to CI alone condition in 14 out of 20 children. Whereas on speech perception
test, there was a significant improvement of 15 to 20% on domains of ESP test in these
children. Factors such as implant age, chronological age, and number of hours of hearing
aid usage were not significantly associated with benefit. Nevertheless aided threshold
at 4,000 Hz was found to be significantly associated with bimodal benefit.
Conclusion Bimodal hearing is beneficial in most of the children than monaural hearing through
cochlear implant.
Keywords
hearing loss - inner ear conditions - otology
