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Normal tympanometric gradient: a comparison of three methods.

R de Jonge

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1986
    PubMed
    Summary
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    Two tympanogram gradient measures, Gratio and GdP, effectively differentiate middle ear effusion. Gdif is less useful due to its correlation with static admittance, making Gratio and GdP preferable for analyzing tympanogram shape.

    Area of Science:

    • Audiology
    • Otoacoustic Emissions
    • Hearing Science

    Background:

    • Tympanometry is crucial for assessing middle ear function.
    • Gradient measures quantify tympanogram shape.
    • Distinguishing normal from effused middle ears requires accurate shape analysis.

    Purpose of the Study:

    • To evaluate the utility of three tympanogram gradient measures (Gdif, Gratio, GdP) in identifying middle ear effusion.
    • To compare the effectiveness of Gdif, Gratio, and GdP in discriminating between normal and effused middle ears.

    Main Methods:

    • Obtained tympanograms from 166 ears of 83 college students with normal middle ear function.
    • Calculated three gradient measures: Gdif, Gratio, and GdP for each tympanogram.
    • Assessed the discriminative power of each gradient measure for middle ear effusion.

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    Main Results:

    • Gdif demonstrated poor utility for gradient measurement, correlating highly with static admittance.
    • Gdif provided limited additional information regarding tympanogram shape.
    • Gratio and GdP were found to be roughly equivalent and superior to Gdif for assessing tympanogram shape.

    Conclusions:

    • Gratio and GdP are preferred measures for analyzing tympanogram shape.
    • These measures are more effective than Gdif in discriminating middle ear effusion.
    • Accurate gradient measurement is vital for diagnosing middle ear conditions.