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KMID : 0858620060100010046
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Korean Journal of Audiology
2006 Volume.10 No. 1 p.46 ~ p.53
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The Effects of Frequency and Intensity on Vestibular Evoked Myogenic Potentials
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Park Ji-Hye
Lee Yong-Bae
Park Sang-Ouk
Kim Tae-Hyung
Jang Hyun-Sook
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Abstract
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The aim of this study was to examine the effects of frequency and intensity on vestibular evoked myogenic potentials (VEMP) which have been used to evaluate the saccule and inferior vestibular nerve of the vestibular apparatus. The response rates, latencies, and amplitude of VEMPs were measured by using click and tone burst stimuli at 500, 1000, 2000, and 4000 Hz with a presentation level of 90 dBnHL and tone-burst stimuli of 500 Hz with varying intensities. VEMPs were recorded in ten healthy young subjects (20 ears) with normal hearing and no history of vestibular-related disease. The results can be summarized as follows：First, with a presentation level of 90 dBnHL, VEMPs were present in all subjects with click and tone-burst stimuli at 500, 1000, and 2000 Hz. Moreover, there were no significant latency and amplitude differences between ears. Second, the latency and amplitude of the VEMP decreased as the stimulus frequency increased. Tone-burst stimuli of 500 Hz showed the most robust and reliable VEMP results. Third, there were no significant latency and amplitude differences when the levels of 500 Hz tone burst decreased from 90 dBnHL to 80 dBnHL. However, high-level stimuli intensity (at least over 85 dBnHL) should be presented for test reliability.
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KEYWORD
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VEMP (vestibular evoked myogenic potential), Click, Tone burst, Latency, Amplitude
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