Comparing Vestibular Evoked Myogenic Potentials and Caloric Test in Patients with Vestibular Schwannoma

  • Maryam Ramezani Department of Audiology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
  • seyedeh nazanin hajjari Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran; Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.

Abstract

Objective: Vestibular Schwannoma (VS)  influences the function of the vestibular nerve system. The present study compared the results of three clinical tests: ocular vestibular evoked myogenic potentials (oVEMP), cervical vestibular evoked myogenic potentials with air conducted sound (cVEMP) and caloric test that evaluated vestibular function in the patients with VS.

Materials and Methods: The present analytical, cross-sectional study was carried out on 5 patients with unilateral VS in the age range of 33-62 years old and 15 normal adults in the age range of 20-27 years old with normal hearing sensitivity) the patients were selected using simple sampling method from among those admitted to AmiralamHospital in Tehran). The investigated indexes included latency time, amplitude and asymmetry ratio of amplitude in oVEMP and Cvemp and canal paresis of the caloric. The applied statistical methods were paired and independent t-tests, Mann-Whitney parametric test and Kolmogorov-Smirnov test.

Results: From among five patients with VS, four showed a reduction or absence of oVEMP amplitude. Three patients demonstrated abnormal results in cVEMP test and 3 others showed abnormal caloric responses.

Conclusion: Vestibular-evoked myogenic potentials, especially oVEMP, are useful tools for assessing vestibular nerve function in VS patients. It seems that they may be useful for assessing preoperative vestibular function or monitoring vestibular function in the patients with tumors for whom the wait-and watch method was selected.

Published
2019-12-27
Section
Original Article