title: Normal Values for Cervical Vestibular-Evoked Myogenic Potentials.
abstract: OBJECTIVE
  To assess the variability of normal values for cervical vestibular-evoked myogenic potentials (cVEMP) testing and to provide guidance regarding which parameters should be reported for clinical practice.
  
  
  METHODS
  Forty-eight normal subjects with no history of hearing loss or vestibular symptoms underwent cVEMP testing. Measurement parameters were tabulated and compared to other sets of cVEMP normal values in the literature. The literature was reviewed to assess the clinical significance of abnormal cVEMP results. The distributions of threshold and symmetry ratios for normal subjects were compared to the distributions of 90 patients who underwent cVEMP testing.
  
  
  METHODS
  Tertiary academic center.
  
  
  RESULTS
  Upper limits of 42% symmetry ratio and the range of 65 to 95 dB HL for threshold were established for our center.The quartile coefficients of dispersion were much less than 1.0 for all cVEMP parameters in the literature, suggesting that the variability in normal ranges across the literature is small. The distributions for threshold and symmetry ratio were similar between normal and patient groups. There is a lack of information in the literature regarding the impairment of function resulting from various degrees of abnormality of VEMP results.
  
  
  CONCLUSIONS
  Normal values for cVEMP parameters are statistically consistent in the literature. The clinical significance of abnormal values has not been validated. For clinical purposes, cVEMP "thresholds" should be reported. Reporting of other parameters is optional.
authors.affiliation: *Department of Otolaryngology, †University of Manitoba, Winnipeg, Manitoba, Canada.
authors.forename: Brian W
authors.initials: BW
authors.lastname: Blakley
authors.forename: Veronica
authors.initials: V
authors.lastname: Wong
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D002574:Cervical Vertebrae / Q000502:physiology*; D004244:Dizziness / Q000175:diagnosis / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D012444:Saccule and Utricle / Q000503:physiopathology; D020711:Threshold Limit Values; D058585:Vestibular Evoked Myogenic Potentials / Q000502:physiology*; D014722:Vestibule, Labyrinth; D055815:Young Adult