Cervical and Ocular vestibular evoked myogenic potentials in individuals with severe to profound hearing loss
Shalini Bansal, Shruti Sahni, Sujeet Kumar Sinha
(Audiology, All India Institute of Speech and Hearing, Mysore, India)
JHS 2013; 3(4): OA56-63
Vestibular Evoked Myogenic Potential (VEMP) is a test to assess the functioning of otolith organs of inner ear. The cervical VEMPs (cVEMPs) assess the saccule and the inferior vestibular nerve, whereas the ocular VEMPs (oVEMPs) assess the utricle and superior vestibular nerve. In individuals with sensorineural hearing loss, disturbances of cochlear function could accompany vestibular impairment since both these parts of inner ear are anatomically related. The aim of the present study was to find out the prevalence of cVEMPs and oVEMPs in individuals with congenital severe to profound sensorineural hearing loss.
Material and Methods: A total of 46 participants participated in the present study, 23 individuals with normal hearing and 23 individuals with bilateral severe to profound hearing loss; cVEMPs and oVEMPs were recorded from all the participants.
Results: Results showed presence of cVEMPs in 100% of the subjects in both control and experimental group; oVEMPs in 100% of control and 66% of experimental group. No correlation was found between cVEMPs and oVEMPs results in hearing impaired individuals. However, Mann Whitney test revealed amplitude of cVEMPs and oVEMPs were significantly lesser in hearing impaired as compared to normal group.
Conclusions: The results indicate impairment in both utricular and saccular functioning in individuals with severe to profound hearing loss. Also oVEMPs were absent in more individuals compared to cVEMPs which is suggestive of utricular function being more linked with cochlea as compared to saccule.
Keywords: oVEMPs, , utricle, cVEMPs, , saccule, , severe to profound hearing loss,