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Related Experiment Videos

Reverse frequency-sweep audiometry in patients with retrocochlear and cochlear deafness.

S Karjalainen, J Kärjä, M Sorri

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1984
    PubMed
    Summary

    Forward-backward sweep-frequency audiometry effectively differentiates eighth-nerve tumors from cochlear deafness. Abnormal tracings strongly suggest retrocochlear lesions, aiding diagnosis.

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    Area of Science:

    • Audiology
    • Neurology
    • Otolaryngology

    Background:

    • Distinguishing between retrocochlear and cochlear hearing loss is crucial for effective patient management.
    • Eighth-nerve tumors and cochlear pathologies present overlapping audiological symptoms.
    • Accurate diagnosis relies on a comprehensive set of audiological tests.

    Purpose of the Study:

    • To evaluate the diagnostic utility of forward-backward sweep-frequency audiometry in differentiating eighth-nerve tumors from cochlear deafness.
    • To assess the effectiveness of the tone decay test in identifying retrocochlear lesions.

    Main Methods:

    • Retrospective analysis of audiological data from 21 patients with surgically confirmed eighth-nerve tumors and 107 patients with cochlear deafness.
    • Utilized sweep-frequency audiometry (forward-backward tracings) and tone decay testing.

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  • Investigated the effect of acoustic loading on sweep-frequency audiometry results.

    • Main Results:

    • Separated forward-backward tracings were observed in 62% of eighth-nerve tumor patients versus 1.9% of cochlear deafness patients.
    • Acoustic loading induced separated tracings in one initially normal eighth-nerve tumor case.
    • Pathological results were found in 67% of eighth-nerve tumor patients and 26% of cochlear deafness patients using the tone decay test.

    Conclusions:

    • Forward-backward sweep-frequency audiometry is a valuable tool for identifying retrocochlear lesions, particularly eighth-nerve tumors.
    • No single test is pathognomonic; a battery of tests is essential for accurate diagnosis.
    • Reverse frequency-sweep audiometry can serve as a useful adaptation test in audiological evaluations.