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A slow brain stem response for low-frequency audiometry.

H Davis, S K Hirsh

    Audiology : Official Organ of the International Society of Audiology
    |November 1, 1979
    PubMed
    Summary
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    Accurate auditory brainstem responses can estimate hearing thresholds in children using specific tone pips and identifying brainwave indicators like P6 and SN10 for reliable audiograms.

    Area of Science:

    • Neuroscience
    • Audiology
    • Pediatrics

    Background:

    • Estimating peripheral auditory thresholds in children is crucial for early diagnosis and intervention.
    • Traditional audiometry can be challenging in young children, necessitating objective measurement techniques.

    Purpose of the Study:

    • To establish a reliable method for obtaining accurate peripheral auditory thresholds in children of all ages.
    • To identify specific brainstem electric responses and stimuli for precise audiogram determination.

    Main Methods:

    • Utilized tone pips (filtered clicks) and brief tone bursts with adjusted rise times for frequency specificity.
    • Identified P6 (Jewett V) as the primary indicator for higher frequencies (≥2000 Hz) and SN10 for lower frequencies (500-1000 Hz).
    • Employed sedation (secobarbital) to facilitate testing in a single session, optimizing clinical workflow.

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    Main Results:

    • Achieved an accuracy of approximately +/- 10 dB for auditory thresholds at 500, 1000, 2000, and 4000 Hz.
    • Established latency characteristics for P6 (6.0-9.5 ms) and SN10 (around 10 ms, 15 ms at threshold) for threshold estimation.
    • Developed a clinical routine enabling the determination of 8 threshold endpoints within approximately 80 minutes.

    Conclusions:

    • The described method provides accurate and efficient auditory threshold estimation in children using brainstem responses.
    • The identification and utilization of P6 and SN10 waves offer reliable indicators for objective audiometry in pediatric populations.
    • This technique, with appropriate stimulus selection and sedation, significantly improves the diagnostic capabilities in pediatric audiology.