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Electrically evoked middle-latency auditory potentials in cochlear implant candidates.
Archives of Otolaryngology--Head & Neck Surgery
|October 1, 1987
Summary
Electric middle-latency auditory evoked responses (EMLRs) show promise for predicting cochlear implant outcomes in hearing-impaired patients. EMLR thresholds closely match behavioral thresholds and correlate with implanted device performance.
Area of Science:
- Audiology
- Neuroscience
- Biomedical Engineering
Background:
- Assessing cochlear implant candidacy requires reliable electrophysiological measures.
- Electric middle-latency auditory evoked responses (EMLRs) offer a potential method for evaluating auditory nerve function.
Observation:
- EMLRs were recorded from profoundly hearing-impaired patients undergoing evaluation for cochlear implants.
- Stimulation was delivered via transtympanic promontory.
- Observed EMLRs showed positive polarity peaks between 20-30 ms, similar to acoustic MLRs.
Findings:
- EMLR thresholds closely approximated behavioral electrical promontory thresholds.
- EMLR thresholds positively correlated with post-implantation thresholds.
- EMLR thresholds negatively correlated with implanted dynamic current ranges.
Implications:
- EMLRs can serve as a valuable predictor of cochlear implant success.
- This technique may refine patient selection and programming for cochlear implants.
- EMLRs provide insights into the functional status of the auditory pathway in hearing-impaired individuals.