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Multifrequency tympanometry. Preliminary experiences with a commercially available middle-ear analyzer

B R Valvik¹, M Johnsen, E Laukli

¹Department of Otorhinolaryngology, University of Tromsø, Norway.

Audiology : Official Organ of the International Society of Audiology

|September 1, 1994

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Researchers used a clinical middle-ear analyzer to study resonance frequencies in normal and diseased ears. Pathologies like tympanic membrane issues and otosclerosis significantly alter these frequencies compared to healthy ears.

Area of Science:

Otolaryngology
Biomedical Engineering
Acoustics

Background:

The middle ear's acoustic properties are crucial for hearing.
Understanding resonance frequency variations can aid in diagnosing ear pathologies.
Multifrequency tympanometry offers a method to assess these properties.

Purpose of the Study:

To determine the resonance frequency of the tympanic membrane/middle-ear system in normal and pathological ears.
To investigate how pathologies affect the resonance frequency.
To correlate resonance frequency changes with mass and stiffness components.

Main Methods:

Utilized a clinical middle-ear analyzer.
Applied the multifrequency tympanometric concept.
Measured resonance frequencies in a cohort of normal and pathological ears.

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Main Results:

Normal ears exhibit a mean resonance frequency close to 1 kHz.
Ears with tympanic membrane pathologies showed significantly different resonance frequencies.
Otosclerotic ears also demonstrated significantly altered resonance frequencies compared to normal ears.

Conclusions:

Resonance frequency is a sensitive indicator of middle-ear system status.
Pathologies affecting the tympanic membrane and otosclerosis demonstrably shift resonance frequencies.
Mass and stiffness variations are likely underlying factors in these observed frequency shifts.