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KMID : 0858620070110010040
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Korean Journal of Audiology
2007 Volume.11 No. 1 p.40 ~ p.44
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Age-Related Changes of Parameters in Vestibular Evoked Myogenic Potentials
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Kwak Hi-Boong
Ahn Jae-Yoon
Park Ga-Hyun
Jeong Yong-Soo
Lee Yeo-Jin
Han Soo-Hee
Ha Eun-Jung
Shin Jung-Eun
Park Hong-Ju
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Abstract
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Background and Objectives : The aim of this study was to investigate the effect of the aging on the vestibular evoked myogenic potentials (VEMP) parameters；amplitude, latency and threshold.
Materials and Methods : VEMP responses to sound stimulation (500 Hz tone burst) were studied in 322 patients with binaural responses at 95 dB nHL stimulation. VEMP from the ear with the larger amplitude were evaluated based on the assumption that the majority of the tested patients probably had normal vestibular function in that ear. Subjects pushed with their jaw against the hand-held inflated cuff to generate cuff pressures of 40 mmHg and sequential stimulation intensities were applied. The intensities of the sound stimulation decreased from 95 dB nHL to the threshold level by 5 dB difference at each cuff pressure. Thresholds, amplitudes, latencies were calculated.
Results: VEMP amplitude was negatively correlated with age and patients older than 60 years showed significant decreased amplitudes compared to those in patients younger than 60 years. VEMP threshold was positively correlated with age and patients older than 60 years showed significant increased thresholds. There was no significant difference in between age groups of 10 to 40s. P1 and N1 latencies had no significant correlation with age.
Conclusion: These findings might suggest that aging could deteriorate the saccular and corresponding neural functions, beginning in fifties. However, latencies do not change over time. Because aging could affect VEMP responses, it is important to get different reference values according to age.
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KEYWORD
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Vestibular evoked myogenic potential, Aging, Sacculocollic reflex
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