title: Optimizing ocular vestibular evoked myogenic potential testing for superior semicircular canal dehiscence syndrome: electrode placement.
abstract: OBJECTIVE
  To compare the sensitivity and specificity of ocular vestibular evoked myogenic potentials (oVEMPs) using 2 electrode montages for the diagnosis of superior canal dehiscence syndrome (SCDS).
  
  
  METHODS
  16 SCDS patients (17 affected-SCDS ears, 15 contralateral-SCDS ears) and 12 controls (24 ears).
  
  
  METHODS
  oVEMPs were recorded in response to 500-Hz tone bursts using 2 electrode montages. For both montages the active electrode was placed approximately 5 mm below each eye and a ground electrode on the sternum. For montage 1 (standard), the reference electrode was centered 2 cm below each active electrode. For montage 2, the reference electrode was placed on the chin.
  
  
  RESULTS
  For either montage, the separation between oVEMP amplitudes in affected-SCDS ears and controls was significant (p < 0.001), with excellent sensitivity and specificity (>90%).
  
  
  CONCLUSIONS
  oVEMP recordings with the standard montage remain a reliable method for evaluation of SCDS.
authors.affiliation: Department of Otolaryngology, Vanderbilt University Medical Center, Nashville, Tenn., USA.
authors.forename: M Geraldine
authors.initials: MG
authors.lastname: Zuniga
authors.forename: Marcela
authors.initials: M
authors.lastname: Davalos-Bichara
authors.forename: Michael C
authors.initials: MC
authors.lastname: Schubert
authors.forename: John P
authors.initials: JP
authors.lastname: Carey
authors.forename: Kristen L
authors.initials: KL
authors.lastname: Janky
mesh_terms: D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D004566:Electrodes; D005260:Female; D006801:Humans; D007759:Labyrinth Diseases / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D012665:Semicircular Canals / Q000503:physiopathology*; D012680:Sensitivity and Specificity; D058585:Vestibular Evoked Myogenic Potentials / Q000502:physiology*; D055815:Young Adult