Speech Perception outcomes in children after bilateral
cochlear implants
Background
The aim of this study was to evaluate the paediatric bilateral cochlear
implants (BiCIs) benefits in speech
perception in silence and noise and to analyse the predicitive factors
Material and methods
A
retrospective study of 65 chidren who received simultaneous (14) and sequential
(51) BiCIs from 2005 to 2016 was conducted in our tertiary CI centre Medical
University of Montpellier. For 32 of them, the
children were too young to perform all the tests and a futher 5 were not available. The data of 28 congenital deaf children aged between 6
and 18 years were evaluated.
The population of the 28 children received
BiCIS between the age of 1.1
year and 16.4 years (average 7.9 years). Tests performed periodically using open set monosyllabic words (PBK),
sentences (MBAA) in silence and noise with 5 dB S/N ratio at 1, 2 and 3 years
post second implantation. Categories of Auditory Performance (CAP) were
recorded..The inter-implant interval was between 0
to 13.6 years (average 2.4 years). Two groups following the inter-interval-implant
< 2 years and >2 years were
evaluated The statistically tests
performed were one factor analysis
of variance (ANOVA)
Results
The results three years after implantation, in
silence with monosyllabic words and sentences were evaluated
for X %IC1, for X %IC2 and for X %IC1&IC2 respectively. No
improvement statistically was demonstrated with both implants.
However with background noise, speech
perception results with open
sentences in noise with 5 dB S/N ration were statistically improved at 1, 2 and
3 years post IC for X
%IC1, for X %IC2 and
for X %IC1&IC2.
Speech perception results with words and
sentences in silence and in noise were correlated with the interval of time. A
significant improvement X %
monosyllabic words X % sentences in silence X % sentences in noise, was
demonstred 3 years post IC, for the
group inter –implant interval < 2years compared with the group inter-implant
interval >2years.
Conclusion
BiCIs provide significant perceptual benefits
for children . These benefits had been demonstrated in speech perception in
noise. The inter-implant interval was shown as an important predictive factor. Others
factors could be also considered as age of the first cochlear implantation, deafness’s aetiology, rehabilitation, family support and
educational setting.
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