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Auditory brain stem response (ABR) in unilateral hearing loss
The Laryngoscope
|April 1, 1981
Summary
Auditory brain stem responses (ABRs) can be misleading in unilateral hearing loss cases. Acoustic crossover may occur when ear differences exceed 60 dB, requiring contralateral masking for accurate ABR audiometry.
Area of Science:
- Audiology
- Neuroscience
- Medical Diagnostics
Background:
- Unilateral hearing loss presents diagnostic challenges.
- Auditory brain stem responses (ABRs) are crucial for assessing auditory function.
- Accurate ABR interpretation is vital for effective hearing loss management.
Purpose of the Study:
- To investigate the phenomenon of acoustic crossover in ABR testing.
- To determine the threshold difference at which crossover becomes significant.
- To provide recommendations for improving ABR accuracy in unilateral hearing loss.
Main Methods:
- ABR testing was conducted on patients with confirmed and suspected unilateral hearing loss.
- Click stimuli were used to assess auditory pathway responses.
- Analysis focused on identifying potential acoustic crossover effects.
Main Results:
- Evidence of acoustic crossover was observed when click threshold differences between ears exceeded approximately 60 dB.
- ABRs from the tested ear may reflect crossover responses from the non-test ear under specific conditions.
- This crossover effect can lead to misinterpretation of auditory function.
Conclusions:
- Contralateral ear masking is essential during ABR audiometry for infants and adults with suspected unilateral hearing loss.
- Implementing masking protocols can prevent misdiagnosis due to acoustic crossover.
- Accurate ABR results are critical for appropriate clinical decisions.