title: [Effect of acoustic stimulus intensity on air-conducted sound elicited ocular vestibular-evoked myogenic potential and cervical vestibular-evoked myogenic potential].
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.
  
  
  CONCLUSIONS
  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.
authors: Department of Otorhinolaryngology, Head and Neck Surgery, Xi'an Jiaotong University College of Medicine, Xi'an 710004, China.E-mail: ruiz0128@163.com.
authors: Rui
authors: R
authors: Zhang
authors: Min
authors: M
authors: Xu
authors: Qing
authors: Q
authors: Zhang
authors: Yin-Tong
authors: YT
authors: Yang
authors: Yanfei
authors: Y
authors: Chen
mesh_terms: D000161:Acoustic Stimulation; D000162:Acoustics; D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005071:Evoked Potentials; D005260:Female; D006801:Humans; D008297:Male; D013016:Sound; D058585:Vestibular Evoked Myogenic Potentials; D055815:Young Adult