Characteristics of large vestibular aqueduct syndrome in wideband acoustic immittance

Frontiers in Neuroscience

Neuroscience

Junyan Gao¹  Haoliang Du²  Yuxuan Xing²  Xia Gao²  Yuqin Xu²  Ning Zhao²  Ye Yang²  Song Gao²  Xiaoyun Qian²  Ao Li² 

[1] Department of Technical Counseling, Jiangsu Children’s Rehabilitation Research Center, Nanjing, China;Jiangsu Provincial Key Medical Discipline (Laboratory), Department of Otolaryngology-Head and Neck Surgery, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, China;Research Institute of Otolaryngology, Nanjing, China;

关键词: large vestibular aqueduct syndrome (LVAS);    wideband acoustic immittance;    maximum absorbance;    mean tympanogram;    frequency-absorbance curve;   

DOI  :  10.3389/fnins.2023.1185033

 received in 2023-03-13, accepted in 2023-05-11,  发布年份 2023

来源: Frontiers

【 摘 要 】

ObjectiveTo describe the characteristics of large vestibular aqueduct syndrome (LVAS) in wideband acoustic immittance (WAI) and to explore whether inner ear deformity has an impact on WAI results.MethodsSubjects with typical LVAS (LVAS group) and control subjects with a normal anatomical structure of the inner ear (control group) were screened from pediatric patients with cochlear implants using thin-slice computed tomography (CT) images of the temporal bone. With inflammation of the auditory canal and middle ear excluded by routine ear examination and 226 Hz acoustic immittance, WAI data were acquired. Then, the maximum absorbance as the major observation indicator on the mean tympanogram was compared between the LVAS group and control group, and a descriptive comparison of the mean tympanogram and frequency-absorbance curve at peak pressure was performed between the two groups.ResultsThe LVAS group included 21 cases (38 ears), and the control group included 27 cases (45 ears). All LVAS subjects met the Valvassori criteria, and the VA at the horizontal semicircular canal displayed flared expansion. On the mean tympanogram, the maximum absorbance in the LVAS group (0.542 ± 0.087) was significantly higher than that in the control group (0.455 ± 0.087) (p < 0.001). The tympanogram in the LVAS group showed an overall elevation, and the absorbance at all pressure sampling points was significantly higher than that in the control group (p < 0.001). The frequency-absorbance curve at peak pressure first increased and then decreased in both groups, and the LVAS group showed higher absorbance than the control group in the frequency range below 2,828 Hz. The absorbance at 343–1,124 Hz was significantly different between the two groups (p < 0.001), and 343–1,124 Hz was the major frequency range at which the maximum absorbance on the mean tympanogram increased in the LVAS group.ConclusionLarge vestibular aqueduct syndrome (LVAS) shows increased absorbance in low and medium frequency ranges in WAI. The maximum absorbance on the mean tympanogram can serve as a reliable evaluation indicator. Inner ear factors must be considered when middle ear lesions are analyzed by WAI.

【 授权许可】

Unknown   
Copyright © 2023 Li, Du, Gao, Xu, Zhao, Gao, Xing, Qian, Gao and Yang.