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:: Volume 19, Issue 2 (9 2010) ::
aud 2010, 19(2): 18-24 Back to browse issues page
Vestibular dysfunctions in cochlear implant patients A vestibular evoked myogenic potential study
Masoud Motasaddi Zarandy1, Mohammad Taghi Khorsandi1, Nima Rezazadeh2, Nasrin Yazdani1, Farhad Mokhtarinejad3, Arash Bayat4, Masoomeh Ruzbehani4
1- Otorhinolaryngology Research Center, Tehran University of Medical Sciences, Iran
2- Department of Audiology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
3- Department of Otorhinolaryngology, Medical University of Isfahan, Iran
4- Department of Audiology, Faculty of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
Abstract:   (8536 Views)

Background and Aim: Vestibular evoked myogenic potential in response to click or short tone burst stimuli have been used as a clinical test for distinguish saccule and inferior vestibular nerve diseases. Different studies show that cochlear implant could have inverse effects on vestibular structures. We aimed to investigate vestibular evoked myogenic potential in unilateral cochlear implanted individuals in compare to normal individuals.
Methods: Thirty-three unilateral cochlear implanted patients (mean age 19.96 years) and 30 normal hearing individuals (mean age 24-27 years) as control group were enrolled in this cross- sectional study. Absolute latencies and amplitudes of myogenic potential responses were measured and compared in both groups.
Results: Myogenic potential recorded in both ears of all controls were normal. No response could be recorded in 16 patients (48.48%) from both ears. In three patients, responses were recorded in both ears though the amplitude of waves was reduced in implanted ear. Unilateral response could be recorded in 14 patients only in their non-implanted ear.
Conclusion: Vestibular evoked myogenic potential test is a useful tool for assessing saccular function in cochlear implant patients. Damages of osseous spiral lamina and basilar membrane after cochlear implantation could result in dysfunctions of vestibular organs specially saccule. It seems that saccule could be easily damaged after cochlear implantation. This would cause absence or reduced amplitudes in myogenic potential.

Keywords: Vestibular evoked myogenic potentials, saccule, cochlear implant
Full-Text [PDF 155 kb]   (2987 Downloads)    
Type of Study: Research |
Received: 2009/09/27 | Accepted: 2010/05/25 | Published: 2013/10/12
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Volume 19, Issue 2 (9 2010) Back to browse issues page
شنوایی شناسی - دانشگاه علوم پزشکی تهران Bimonthly Audiology - Tehran University of Medical Sciences
Creative Commons Attribution-NonCommercial 3.0

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