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Electrical And Speech Outcome Measures For The Evaluation Of Cochlear Implantees | 43343
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Introduction: Cochlear implant recipients vary in their performance with their implants. One of the reasons of difference in
performance might be the number of surviving spiral ganglion cells. Potentials evoked by electrical stimulation of the auditory nerve
depend on the degree of synchrony of neural firing. Thus it is expected that cochlear implant recipients who show electrically evoked
potentials at different levels of the auditory nervous system might perform better than those who do not.
The aim of this study: To record EABR and EMLR from cochlear implant users, investigate consistency over time, investigate the
relationship between electrophysiology and MAP psychophysics and correlate the recordings with speech perception scores.
Subjects: Twenty four cochlear implanted subjects were recruited from Audiology clinic; Otolaryngology Department, Faculty of
Medicine, University of Alexandria, Egypt The inclusion criteria were to have a functioning implant that possessed a bidirectional
telemetry feature.
Methodology: All subjects underwent the following, (1) detailed history taking medical and surgical, (2) aided free field testing with
their implants, (3) electrically evoked potentials recordings, (4) Speech perception testing was performed at the phonetic level using
the speech pattern contrast test that tested the ability of cochlear implant users to differentiate between contrasts related to vowels
and consonants.
Results: Most of the subjects showed responses at one or more electrically evoked potential. Electrophysiological thresholds of
EABR were within patients’ dynamic ranges and were detected form the first recording time and were generally consistent over time.
EMLR was absent in many children before 1 year of implant use. All subjects were able to detect vowels and consonants, however,
performance in the discrimination task varied. Comparing different speech perception scores with electrophysiological parameters
revealed that the slope of EABR amplitude growth function showed significant correlation with fricative discrimination. Also, EABR
latency decreased whereas amplitude increased with increased performance. There was no relationship between the numbers of the
electrophysiological levels showing performance and speech perception scores.
Conclusion: EABR might serve as a predictor of speech performance at the phonetic level; however, increasing the sample size is
required for generalization.
Biography
Manal El-Banna has completed her MD in 2005 from Alexandria University and became Assistant Professor in Phoniatrics in 2011. She is a member of IALP since 1998. She is consultant at the Clinical Genomic center since 2010. She has published 13 papers at national and international journals.