title: Endolymphatic hydrops in asymptomatic ears in unilateral Ménière's disease.
abstract: OBJECTIVE
  The aim of our study was the objective assessment of endolymphatic hydrops in asymptomatic ears in unilateral Ménière's disease with a noninvasive electrophysiological test and investigation of significant clinical signs. The null hypothesis was that there would be no signs of endolymphatic hydrops in the asymptomatic ear.
  
  
  METHODS
  Prospective study using the traveling wave velocity test for endolymphatic hydrops.
  
  
  METHODS
  The traveling wave velocity test was used in conjunction with standard audiological tests to investigate both ears of 181 Ménière's patients attending the Medical Research Council Institute of Hearing Research in Southampton, United Kingdom. The test uses derived auditory brainstem responses to estimate the velocity of the cochlear traveling wave that is altered in endolymphatic hydrops. Ménière's disease was assessed using Arenberg's five staging criteria. Significant correlations were evaluated using standard statistical methods.
  
  
  RESULTS
  Of 100 patients with clinically unilateral Ménière's disease, 27% showed evidence of endolymphatic hydrops in their asymptomatic ear. There was a significant correlation between signs of hydrops and the mean air-conduction threshold at 500 Hz.
  
  
  CONCLUSIONS
  We recommend that a full assessment of incipient disease in the asymptomatic ear in unilateral Ménière's disease should be undertaken before offering any treatment options to patients. Any suspicion of early disease in the asymptomatic ear in unilateral Ménière's disease should lead to full electrophysiological assessment to assess the evidence of endolymphatic hydrops in that ear.
authors.affiliation: Medical Research Council Institute of Hearing Research, Royal South Hants Hospital, Southampton, Hampshire, SO14 0YG, U.K.
authors.forename: I
authors.initials: I
authors.lastname: Friedrichs
authors.forename: A R
authors.initials: AR
authors.lastname: Thornton
mesh_terms: D018159:Endolymphatic Hydrops / Q000150:complications* / Q000175:diagnosis; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006801:Humans; D008297:Male; D008575:Meniere Disease / Q000150:complications*; D011446:Prospective Studies