Abstract
Objective
The apparent effect of superior semicircular canal dehiscence (SSCD) on middle ear-
and cochlear impedance has led researchers to investigate the use of wideband acoustic
immittance as a screening tool when SSCD is suspected. The purpose of the study was
to describe the absorbance characteristics and tympanometric values of ears with confirmed
SSCD measured at tympanometric peak pressure (TPP) and at ambient pressure.
Methods
Wideband Acoustic Immittance was performed at ambient pressure and at TPP on ten participants
(12 ears) with confirmed SSCD, as well as on an age- and gender matched control group
(12 ears). Inferential statistics were used to determine whether statistical differences
existed for the absorbance values at each of the averaged frequencies, the resonance
frequency (RF) and tympanometric data between the SSCD and control groups.
Results
The mean absorbance of the SSCD group reached a maximum at 890.9 Hz and a minimum
at 6349.6 Hz. When testing absorbance at TPP, a statistically significant increase/peak
in the absorbance values of the SSCD group (compared to those of the control group)
was found from 630 to 890.9 Hz and a decrease from 4489.8 to 6349.6 Hz. Similar patterns
were observed for absorbance at ambient pressure. A lower mean RF for ears with SSCD
as well as an increased mean admittance magnitude (AM) value at RF was found compared
to those of the control group.
Conclusion
The use of SSCD as a screening tool when SSCD is suspected was strengthened by results
similar to those of previous studies. As a result of the significant difference in
RF of SSCD ears compared to the RF of the control group, the potential value of measuring
the RF of the middle ear to differentiate between mass-and stiffness dominated pathologies,
was also illustrated.
Keywords
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Article Info
Publication History
Published online: March 26, 2022
Accepted:
March 4,
2022
Received:
November 9,
2020
Identification
Copyright
© 2022 Japanese Society of Otorhinolaryngology-Head and Neck Surgery, Inc. Published by Elsevier B.V. All rights reserved.
