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Wideband tympanometry findings in inner ear malformations
Şule Kaya1, Betül Çiçek Çınar2, Merve Özbal Batuk2
1Ankara Yildirim Beyazit University, Faculty of Health Sciences, Audiology Department, Ankara, Turkey.
Auris, Nasus, Larynx
|September 22, 2019
Summary
Inner ear malformations significantly alter middle ear functions, impacting sound transfer. Wideband tympanometry (WBT) reveals distinct differences in these functions across various malformation types, aiding diagnosis.
Area of Science:
- Otolaryngology
- Audiology
- Medical Imaging
Background:
- Inner ear (cochlea) deficits can affect middle ear function and impedance matching.
- Wideband tympanometry (WBT) is crucial for evaluating ear sound transfer functions.
Purpose of the Study:
- Investigate ear transfer functions in inner ear malformations using WBT.
- Determine if these functions vary based on the type of inner ear malformation.
Main Methods:
- Prospective case-control study of 157 ears with various inner ear malformations (cochlear hypoplasia, incomplete partition I/II, cochlear aplasia, complete labyrinthine aplasia) and 30 normal ears.
- Evaluated traditional tympanometric parameters and WBT measures including absorbance and averaged wideband tympanometry.
- Analyzed tympanometric peak pressure, equivalent middle ear volume, static admittance, tympanogram width, and resonance frequency.
Main Results:
- Significant differences (p<0.05) were observed in WBT parameters between malformation groups and controls, and among malformation groups.
- Complete labyrinthine aplasia showed the most significant differences from controls, particularly in absorbance at high frequencies.
- Absence of inner ear structures negatively affected energy absorbance and other middle ear transfer functions.
Conclusions:
- Inner ear malformations distinctly impact middle ear transfer functions.
- WBT provides valuable data for diagnosing inner ear malformations by revealing altered energy absorbance and transfer characteristics.
- WBT can offer additional diagnostic information for patients with inner ear malformations.
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