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Absent auditory brain stem response: peripheral hearing loss or brain stem dysfunction?

N Kraus, O Ozdamar, L Stein

    The Laryngoscope
    |March 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

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    Auditory brain stem response (ABR) interpretation can be challenging when waves III and V are absent. This study found 15% of patients with absent ABR waves had better hearing than expected, suggesting other diagnostic factors are crucial.

    Area of Science:

    • Audiology
    • Neuroscience
    • Electrophysiology

    Background:

    • Interpreting Auditory Brainstem Response (ABR) is complex when waves III and V are absent.
    • Absent waves can indicate severe hearing loss, brainstem issues, or both.

    Observation:

    • 48 patients with no known brainstem damage showed absent ABR waves III and V.
    • 15% of these patients (7/48) had better hearing sensitivity than ABR suggested.
    • Abnormal acoustic reflex findings were present in all patients with better-than-expected hearing.

    Findings:

    • Severe to profound hearing loss was confirmed in 38 patients.
    • 7 patients demonstrated normal to moderate hearing sensitivity despite absent ABR waves III and V.
    • This highlights a subgroup where ABR findings may not fully align with pure-tone audiometry.

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    Implications:

    • Suggests a need for comprehensive audiological and neurological evaluation beyond ABR.
    • Highlights the importance of acoustic reflex testing in ambiguous ABR cases.
    • Informs differential diagnosis for hearing loss and potential brainstem dysfunction.