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Threshold sensitivity and frequency specificity in auditory brainstem response audiometry.

H Davis, S K Hirsh, L L Turpin

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1985
    PubMed
    Summary
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    Sedation enables frequency-specific electric response audiometry in difficult-to-test children. This method provides accurate hearing threshold estimates for hearing aid selection.

    Area of Science:

    • Audiology
    • Neuroscience
    • Pediatrics

    Background:

    • Assessing hearing in young children is challenging.
    • Sedation can facilitate audiological testing.
    • Electric response audiometry (ERA) offers frequency-specific information.

    Purpose of the Study:

    • To establish a reliable method for frequency-specific ERA in sedated, difficult-to-test young children.
    • To identify optimal acoustic stimuli and recording parameters for this population.
    • To determine the accuracy and utility of ERA for hearing aid fitting.

    Main Methods:

    • Utilized secobarbital for sedation, dosed by weight.
    • Employed '2-1-2' tone bursts (500, 1000, 2000, 4000 Hz) as acoustic stimuli.
    • Focused on the P6-SN10 brainstem response using a specific Butterworth filter (50-1700 Hz).

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    Main Results:

    • The P6-SN10 response proved robust and sensitive across frequencies, minimally affected by sedation.
    • Optimized recording parameters (filter, sweep time, rate, averaging) simplified the procedure.
    • A one-hour testing routine was developed, including correction factors for threshold estimation.

    Conclusions:

    • Frequency-specific ERA is feasible and effective in sedated young children.
    • The described method yields hearing threshold estimates accurate within 10 dB.
    • This technique supports appropriate hearing aid selection for pediatric patients.