Effect of acoustic stimulus intensity on air-conducted sound elicited ocular vestibular-evoked myogenic potential and cervical vestibular-evoked myogenic potential
10.3969/j.issn.1673-4254.2014.06.01
- VernacularTitle:刺激声强度对气导短纯音诱发的眼肌和颈肌前庭诱发肌源性电位的影响
- Author:
Rui ZHANG
1
;
Min XU
;
Qing ZHANG
;
Yintong YANG
;
Yanfei CHEN
Author Information
1. 西安交通大学医学院第二附属医院耳鼻咽喉头颈外科
- Keywords:
stimulus intensity;
vestibule;
ocular vestibular-evoked myogenic potential;
cervical vestibular-evoked myogenic potential
- From:
Journal of Southern Medical University
2014;(6):753-758
- CountryChina
- Language:Chinese
-
Abstract:
Objective To observe the effect of acoustic stimulus intensity on air-conducted sound elicited ocular vestibular-evoked myogenic potential (oVEMP) and cervical vestibular-evoked myogenic potential (cVEMP) in normal young Chinese subjects. Methods Thirty-five normal subjects aged 4-40 years (20.80 ± 8.89 years), including 16 males and 19 females, were recruited for conventional oVEMP and cVEMP examinations. The responses obtained from each side using 500 Hz tone bursts were divided into 6 groups according to different sound intensities (100, 95, 90, 85, 80 and 75dB nHL). The response rate and normal parameters of each stimulus intensity group were calculated. Results As the acoustic stimulus intensity decreased, the oVEMP response rate decreased from 100%in both 100 dB nHL and 95dB nHL groups to 97.14%(90 dB nHL), 54.29%(85 dB nHL), 14.29%(80 dB nHL), and 2.86%(75 dB nHL), and the response rate of cVEMP, 100%in both 100 dB nHL and 95dB nHL groups, was lowered to 97.14%(90 dB nHL), 84.29%(85 dB nHL), 38.57%(80 dB nHL) and 8.57%(75 dB nHL). The response rate and the parameters were comparable between 100 and 95 dB nHL groups. Conclusion As the acoustic stimulus intensity decreases, both oVEMP and cVEMP show decreased response rate and amplitude. For Chinese subjects under 40 years of age, we recommend 95dB nHL as the maximum initial stimulus intensity in VEMPs test.
