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July2004 Vol.41 Issue:        2        Table of Contents
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Vestibular evoked myogenic potentials: Non invasive test of vestibular function

Eman A. Ghorab1, Azza El-Attar2
Departments of Audiology, Hearing and Speech Institute, Giza1, ENT, Audiology Unit, Al-Azhar University(for Girls)2


Vestibular evoked myogenic potentials (VEMPs), generated by click stimulation and recorded on trapezius muscle have been used as a test of vestibular reflexes. Various parameters of the stimulus and recording setting have been studied. However, the effect of stimulation repetition rate on VEMPs and the most optimal stimulation rate for clinical use have not been defined. In this study 40 ears from 20 normal hearing adults were tested at five different click stimulation rates (1.1, 5.5, 7.7, 10.5 and 15.3 stimulus/sec) in random order. VEMPs response was evident in all 40 ears tested at 1.1, 5.5., 7.7 and 10.5 repetition rates, but 3 ears failed to response at 15.3 stim/sec. Gender had no effect and also no difference was found between right and left ears. There was no significant difference between different rates in latencies, but there was significant difference in amplitude. The amplitude was higher at 1.1 and progressively decreasing as the stimulation rate increased.

(Egypt J. Neurol. Psychiat. Neurosurg., 2004, 41(2): 415-422).


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