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Auditory brainstem responses as a function of average hearing sensitivity for 2,000-4,000 Hz
Summary
Poorer hearing sensitivity in the 2,000-4,000 Hz range correlates with abnormal auditory brainstem responses (ABR). Mild hearing loss and normal ABR are common when thresholds are better than 40 dB at 2,000 Hz.
Area of Science:
- Audiology
- Neuroscience
- Otolaryngology
Background:
- Cochlear hearing loss affects auditory processing.
- Auditory brainstem responses (ABR) assess auditory pathway function.
- High-frequency hearing loss is common in various etiologies.
Purpose of the Study:
- To investigate the relationship between high-frequency hearing thresholds and ABR results.
- To determine the correlation between specific hearing loss patterns and ABR abnormalities.
Main Methods:
- Analysis of average hearing thresholds at 2,000, 3,000, and 4,000 Hz.
- Evaluation of ABR results in 290 patients with cochlear hearing loss.
- Correlation of audiometric data with ABR waveform normality.
Main Results:
- Increased incidence of abnormal ABR with poorer hearing sensitivity in the 2,000-4,000 Hz range.
- Nearly 80% of ABR tracings were normal when 2,000-Hz threshold was 0-40 dB and average loss was <50 dB.
- Steeply sloping audiograms above 2,000 Hz significantly increased abnormal ABR results.
Conclusions:
- High-frequency hearing sensitivity is a key predictor of ABR normality in cochlear hearing loss.
- ABR can be normal even with mild high-frequency hearing loss.
- Audiogram slope above 2,000 Hz is critical for interpreting ABR findings.