Problems in interpretation of brainstem-evoked response audiometry results

Area of Science:

• Audiology
• Neuroscience
• Pediatrics

Background:

• Brainstem-evoked response audiometry (ABR) is a standard audiological test.
• ABR assesses auditory pathway function from the cochlea to the brainstem.
• Interpreting ABR results in patients with neurological conditions requires careful consideration.

Purpose of the Study:

• To investigate cases where ABR yielded no response despite near-normal hearing sensitivity.
• To explore the potential link between neurological deficiencies and absent ABR responses.
• To highlight the diagnostic implications of absent ABR in central nervous system disorders.

Main Methods:

• Case study analysis of 6 patients (3 adults, 3 children).
• Performance of brainstem-evoked response audiometry (ABR) with maximal click intensity.
• Evaluation of neurological status and hearing sensitivity in all participants.

Main Results:

• No ABR response was obtained in all 6 cases, even with maximal stimulation.
• Patients exhibited nearly normal hearing sensitivity.
• All cases presented with mild neurological deficiencies, suggesting impaired biological response synchronization.

Conclusions:

• An absent ABR response in individuals with normal hearing sensitivity does not automatically confirm severe hearing loss.
• Neurological deficiencies, particularly those affecting central nervous system synchronization, can lead to absent ABR.
• Absent ABR in the context of neurological involvement can serve as a valuable diagnostic indicator for central nervous system disorders.