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Wang J, Liang J, Gao L, Yao W. Study on damage of the macrostructure of the cochlea under the impact load. Proc Inst Mech Eng H 2023; 237:1390-1399. [PMID: 37955248 DOI: 10.1177/09544119231209187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2023]
Abstract
Due to the tiny and delicate structure of the cochlea, the auditory system is the most sensitive to explosion impact damage. After being damaged by the explosion impact wave, it usually causes long-term deafness, tinnitus, and other symptoms. To better understand the influence of impact load on the cochlea and basilar membrane (BM), a three-dimensional (3D) fluid-solid coupling finite element model was developed. This model accurately reflects the actual spatial spiral shape of the human cochlea, as well as the lymph environment and biological materials. Based on verifying the reliability of the model, the curve of impact load-amplitude response was obtained, and damage of impact load on the cochlea and the key macrostructure-BM was analyzed. The results indicate that impact wave at middle frequency has widest influence on the cochlea. Furthermore, impact loading causes tears in the BM and destroys the cochlear frequency selectivity.
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Affiliation(s)
- Jiakun Wang
- School of Mechanics and Engineering Science, Shanghai University, Shanghai, China
- Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai, China
| | - Junyi Liang
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH, USA
| | - Lei Gao
- School of Mechanics and Engineering Science, Shanghai University, Shanghai, China
- Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai, China
| | - Wenjuan Yao
- School of Mechanics and Engineering Science, Shanghai University, Shanghai, China
- Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai, China
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Wang SQ, Li CL, Xu JQ, Chen LL, Xie YZ, Dai PD, Ren LJ, Yao WJ, Zhang TY. The Effect of Endolymphatic Hydrops and Mannitol Dehydration Treatment on Guinea Pigs. Front Cell Neurosci 2022; 16:836093. [PMID: 35480960 PMCID: PMC9035551 DOI: 10.3389/fncel.2022.836093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 02/24/2022] [Indexed: 01/14/2023] Open
Abstract
Background Endolymphatic hydrops (EH) is considered as the pathological correlate of Menière’s disease (MD) and cause of hearing loss. The mechanism of EH, remaining unrevealed, poses challenges for formalized clinical trials. Objective This study aims to investigate the development of hearing loss, as well as the effect of dehydration treatment on EH animal models. Methods In this study, different severity EH animal models were created. The laser Doppler vibrometer (LDV) and auditory brainstem responses (ABR) were used to study the effects of EH and the dehydration effects of mannitol. The LDV was used to measure the vibration of the round window membrane (RWM) reflecting the changes in inner ear impedance. ABR was used to evaluate the hearing changes. Furthermore, tissue section and scanning electron microscopy (SEM) observations were used to analyze the anatomical change to the cochlea and outer hair cells. Results The RWM vibrations decreased with the severity of EH, indicating an increase in the cochlear impedance. The dehydration therapy lowered the impedance to restore acoustic transduction in EH 10- and 20-day animal models. Simultaneously, the ABR thresholds increased in EH models and were restored after dehydration. Moreover, a difference in the hearing was found between ABR and LDV results in severe EH animal models, and the dehydration therapy was less effective, indicating a sensorineural hearing loss (SNHL). Conclusion Endolymphatic hydrops causes hearing loss by increasing the cochlear impedance in all tested groups, and mannitol dehydration is an effective therapy to restore hearing. However, SNHL occurs for the EH 30-day animal models, limiting the effectiveness of dehydration. Our results suggest the use of dehydrating agents in the early stage of EH.
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Affiliation(s)
- Shu-Qi Wang
- Department of Facial Plastic Reconstruction Surgery, Eye and ENT Hospital of Fudan University, Shanghai, China
- ENT Institute, Eye and ENT Hospital of Fudan University, Shanghai, China
| | - Chen-Long Li
- Department of Facial Plastic Reconstruction Surgery, Eye and ENT Hospital of Fudan University, Shanghai, China
- ENT Institute, Eye and ENT Hospital of Fudan University, Shanghai, China
- Hearing Medicine Key Laboratory, National Health Commission of China, Shanghai, China
| | - Jing-Qi Xu
- Department of Facial Plastic Reconstruction Surgery, Eye and ENT Hospital of Fudan University, Shanghai, China
- ENT Institute, Eye and ENT Hospital of Fudan University, Shanghai, China
| | - Li-Li Chen
- Department of Facial Plastic Reconstruction Surgery, Eye and ENT Hospital of Fudan University, Shanghai, China
- ENT Institute, Eye and ENT Hospital of Fudan University, Shanghai, China
- Hearing Medicine Key Laboratory, National Health Commission of China, Shanghai, China
| | - You-Zhou Xie
- Department of Facial Plastic Reconstruction Surgery, Eye and ENT Hospital of Fudan University, Shanghai, China
- ENT Institute, Eye and ENT Hospital of Fudan University, Shanghai, China
- Hearing Medicine Key Laboratory, National Health Commission of China, Shanghai, China
| | - Pei-Dong Dai
- Department of Facial Plastic Reconstruction Surgery, Eye and ENT Hospital of Fudan University, Shanghai, China
- ENT Institute, Eye and ENT Hospital of Fudan University, Shanghai, China
| | - Liu-Jie Ren
- Department of Facial Plastic Reconstruction Surgery, Eye and ENT Hospital of Fudan University, Shanghai, China
- ENT Institute, Eye and ENT Hospital of Fudan University, Shanghai, China
- Hearing Medicine Key Laboratory, National Health Commission of China, Shanghai, China
- *Correspondence: Liu-Jie Ren,
| | - Wen-Juan Yao
- School of Mechanics and Engineering Science, Shanghai University, Shanghai, China
- Shanghai Institute of Applied Mathematics and Mechanics, Shanghai, China
- Wen-Juan Yao,
| | - Tian-Yu Zhang
- Department of Facial Plastic Reconstruction Surgery, Eye and ENT Hospital of Fudan University, Shanghai, China
- ENT Institute, Eye and ENT Hospital of Fudan University, Shanghai, China
- Hearing Medicine Key Laboratory, National Health Commission of China, Shanghai, China
- Tian-Yu Zhang,
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