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[Changes of the late acoustically evoked potentials in postlingually deaf patients with cochlear implants]
R Schmidt1, H Kaftan, W Hosemann
1Klinik und Poliklinik für Hals-, Nasen- und Ohrenkrankheiten, Kopf- und Hals-Chirurgie der Ernst-Moritz-Arndt-Universität Greifswald. audiomet@uni-greifswald.de
Laryngo- Rhino- Otologie
|March 17, 2005
Summary
Longer deafness duration in postlingually deaf patients correlates with poorer speech recognition and altered auditory evoked potentials. Minimizing deafness duration before cochlear implantation is crucial for better outcomes.
Area of Science:
- Neuroscience
- Audiology
- Speech-Language Pathology
Background:
- Postlingual deafness duration impacts speech recognition, potentially due to auditory cortex reorganization.
- Prolonged auditory deprivation may reduce neuronal activity in auditory cortices.
- Late acoustically evoked potentials reflect auditory cortex function.
Purpose of the Study:
- To investigate the relationship between the duration of deafness, speech recognition, and late acoustically evoked potentials in postlingually deaf patients.
- To explore how functional reorganization in the auditory cortex affects speech perception after long-term auditory deprivation.
Main Methods:
- Assessed speech recognition (HSM-set-test) and late acoustically evoked potentials in 9 postlingually deaf patients with cochlear implants (CI).
- Included one patient with prelingual deafness, implanted at age 14.
- Examined correlations between evoked potentials, speech recognition, and deafness duration.
Main Results:
- Typical late acoustically evoked potentials were observed in 3 patients with good speech recognition and shorter deafness (≤6 years).
- In 6 patients with longer deafness (≥12 years), only N1 potentials were present; P2 and N2 were absent, correlating with lower speech recognition scores.
- The prelingual deaf patient showed absent speech recognition and atypical evoked potentials.
Conclusions:
- A significant correlation exists between the duration of deafness, the characteristics of late acoustically evoked potentials, and speech perception abilities.
- Shorter durations of deafness prior to cochlear implantation are recommended for both deaf children and postlingually deaf adults to optimize outcomes.