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Normal values of the ipsilateral acoustic stapedius reflex threshold.

U Reker

    Archives of Oto-Rhino-Laryngology
    |March 8, 1977
    PubMed
    Summary

    The stapedius reflex, often assumed symmetrical, shows ipsilateral thresholds 15 dB lower than contralateral. This study redefines normal values for ipsilateral acoustic stapedius reflex thresholds, crucial for audiological assessments.

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    Area of Science:

    • Audiology
    • Neuroscience
    • Otoacoustic Emissions

    Background:

    • The acoustically evoked stapedius reflex is typically assumed to be bilaterally symmetrical.
    • Møller previously described an asymmetry, noting ipsilateral thresholds 2-14 dB lower than contralateral.
    • Accurate determination of ipsilateral stapedius reflex thresholds is challenging due to probe placement variability.

    Purpose of the Study:

    • To accurately determine normal values for the ipsilateral acoustic stapedius reflex threshold.
    • To investigate the asymmetry between ipsilateral and contralateral stapedius reflex thresholds.
    • To establish a basis for redefining normal values for ipsilateral Metz recruitment.

    Main Methods:

    • Utilized unilaterally deaf patients with a precisely calibrated headphone stimulus applied to the deaf ear.
    • Calculated exact ipsilateral intensity by subtracting individual cross-hearing loss.
    • Evoked stapedius reflexes in 49 out of 62 patients and mathematically analyzed data, including negative cases.

    Main Results:

    • Established median ipsilateral stapedius reflex thresholds: 59 dB at 0.5 kHz, 62.5 dB at 1 kHz, 67 dB at 2 kHz, and approx. 67 dB at 4 kHz.
    • Observed a difference of approximately 15 dB between ipsilateral and contralateral stapedius reflex thresholds.
    • Demonstrated the feasibility of evoking a stapedius reflex using the described method in a significant portion of patients.

    Conclusions:

    • The ipsilateral acoustic stapedius reflex threshold is significantly lower than the contralateral, averaging a 15 dB difference.
    • A new definition for normal values of the ipsilateral acoustic stapedius reflex threshold is necessary.
    • This refined methodology provides a more accurate assessment of stapedius reflex thresholds for audiological diagnosis.

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