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Tympanometry:between ear symmetry and normative values.

Journal of the American Auditory Society

|September 1, 1979

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This study explored tympanometric symmetry limits in normal individuals, suggesting a 4/3 ratio for ear compliance. This finding helps define normal middle ear function more precisely.

Area of Science:

Audiology
Otolaryngology
Medical Physiology

Background:

Auditory function asymmetry between ears typically signals an abnormality.
Understanding the normal range of tympanometric symmetry is crucial for accurate diagnosis.

Purpose of the Study:

To investigate the limits of tympanometric symmetry in healthy individuals.
To establish a precise criterion for normal middle ear compliance asymmetry.

Main Methods:

Analysis of tympanometric measurements in a cohort of normal subjects.
Application of a proposed 4/3 ratio for left/right ear compliance.
Inclusion of strict criteria for middle ear pressure and acoustic reflex thresholds.

Main Results:

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A limiting ratio of 4/3 between left and right ear compliances is proposed for normal individuals.
A smaller range for "normality" in middle ear compliance was identified compared to previous studies.
Significant differences in middle ear compliance were observed between male and female subjects.

Conclusions:

The proposed 4/3 compliance ratio offers a refined measure for tympanometric symmetry.
Observed sex-based differences in middle ear compliance may relate to anatomical variations.
This research contributes to a more accurate definition of normal middle ear function.