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A lower audiometric limit for auditory brainstem response (ABR)

E Borg, L Löfqvist

    Scandinavian Audiology
    |January 1, 1982
    PubMed
    Summary
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    This study defines the lower limit for reproducible Auditory Brainstem Response (ABR) testing in individuals with high-tone hearing loss. It found that a lack of ABR does not necessarily mean a complete loss of usable hearing.

    Area of Science:

    • Audiology
    • Neuroscience
    • Hearing Science

    Background:

    • Auditory Brainstem Response (ABR) is crucial for assessing hearing sensitivity, especially in cases of high-tone hearing loss.
    • Defining reproducible ABR thresholds helps in accurate diagnosis and audiological management.
    • Previous studies have not precisely delineated the audiometric limits for reliable ABR in steep high-tone loss.

    Purpose of the Study:

    • To determine the lower audiometric frequency limit for obtaining reproducible Auditory Brainstem Response (ABR) in subjects with varying degrees of steep high-tone loss.
    • To establish the correlation between specific audiogram configurations and the presence or absence of reproducible ABR signals.
    • To investigate whether the absence of ABR at certain frequencies indicates a complete lack of potentially useful hearing.

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    Main Methods:

    • Testing subjects with steep high-tone hearing loss using 2.0 kHz haversine wave stimuli at 75 dB and 85 dB nHL.
    • Analyzing audiograms to identify cut-off frequencies and correlating them with the presence of reproducible ABR.
    • Establishing the audiometric threshold (in dB HL) at 500 Hz and 1000 Hz that differentiates between the presence and absence of reproducible ABR.

    Main Results:

    • A reproducible ABR was consistently obtained in subjects with high-tone loss up to a certain audiometric limit.
    • The boundary between audiograms with and without reproducible ABR was found to be approximately 40-50 dB HL at 500 Hz and 80-90 dB HL at 1000 Hz.
    • The study demonstrated that a lack of ABR response did not equate to a total absence of potentially useful hearing.

    Conclusions:

    • The defined audiometric limits provide a practical guideline for ABR testing in individuals with steep high-tone loss.
    • Clinicians should consider that a negative ABR result does not rule out residual hearing, necessitating further audiological evaluation.
    • This research refines the understanding of ABR applicability in specific hearing loss configurations, aiding in better patient assessment and management.