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The auditory brain stem response I-V amplitude ratio in normal, cochlear, and retrocochlear ears
Ear and Hearing
|January 1, 1984
Summary
The auditory brain stem response I-V amplitude ratio can help differentiate between cochlear and retrocochlear hearing loss. A ratio below 1.00 is uncommon in normal or cochlear ears but frequent in retrocochlear conditions.
Area of Science:
- Audiology
- Neuroscience
- Otolaryngology
Background:
- The auditory brain stem response (ABR) is a key diagnostic tool.
- Distinguishing cochlear from retrocochlear pathologies is clinically significant.
Purpose of the Study:
- To evaluate the diagnostic utility of the auditory brain stem response I-V amplitude ratio.
- To differentiate between normal, cochlear, and retrocochlear ears using ABR.
Main Methods:
- Auditory brain stem response (ABR) testing was performed.
- The I-V amplitude ratio was calculated for 75 ears (25 normal, 25 cochlear, 25 retrocochlear).
Main Results:
- Amplitude ratios < 1.00 were rare in normal and cochlear ears.
- 44% of retrocochlear ears exhibited an amplitude ratio < 1.00.
Conclusions:
- The ABR I-V amplitude ratio is a valuable indicator for identifying retrocochlear hearing loss.
- This ratio aids in the differential diagnosis of auditory pathway disorders.