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Some observations on the contralateral stapedial reflex artefact

P Newall, R A Royall, G R Lightfoot

    British Journal of Audiology
    |August 1, 1978
    PubMed
    Summary
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    Acoustic impedance testing in deaf children revealed a pseudo-reflex artefact caused by sound transmission. An electronic filter was developed to eliminate this artifact, preventing misdiagnosis of stapedial reflex responses.

    Area of Science:

    • Audiology
    • Bioacoustics
    • Medical Instrumentation

    Background:

    • The stapedial reflex technique is crucial for assessing auditory function.
    • High-intensity stimuli in acoustic impedance testing can introduce measurement artefacts.
    • Previous observations noted anomalies during contralateral stapedial reflex testing in deaf children.

    Purpose of the Study:

    • To investigate and identify the cause of a pseudo-reflex artefact observed during acoustic impedance measurements.
    • To develop a method for suppressing this artefact in clinical audiology.
    • To prevent potential misinterpretation of the artefact as a true stapedial reflex.

    Main Methods:

    • Utilized a Peters AP61c acoustic impedance meter for testing.
    • Employed the contralateral stapedial reflex technique at high stimulus levels.

    Related Experiment Videos

  • Conducted cadaver studies to confirm the artefact's origin.
  • Designed and implemented an electronic filter to mitigate the artefact.

    • Main Results:

    • Confirmed the presence of a pseudo-reflex artefact during contralateral stapedial reflex testing.
    • Identified sound transmission across the head as the cause of the artefact.
    • Demonstrated successful suppression of the artefact using a custom-designed electronic filter.

    Conclusions:

    • The observed artefact mimics a genuine stapedial reflex, posing a diagnostic challenge.
    • The developed electronic filter effectively removes the pseudo-reflex, improving test accuracy.
    • This finding is significant for accurate audiological assessment in individuals with hearing impairments.