title: Secondary endolymphatic hydrops after sudden deafness.
abstract: CONCLUSIONS
  Patients with sudden deafness who had abnormal ocular vestibular-evoked myogenic potential (oVEMP)/cervical VEMP (cVEMP) responses but retained caloric function may subsequently develop secondary hydrops with a mean interval of 8 years.
  
  
  OBJECTIVE
  This study applied the inner ear test battery in patients who had sudden deafness previously to elucidate how secondary endolymphatic hydrops occurs years after sudden deafness.
  
  
  METHODS
  Twenty patients who had experienced recent vertiginous attacks several years after sudden deafness (group A) and 20 patients without rotational vertiginous episode for at least 5 years following sudden deafness (group B) were enrolled. All patients underwent an inner ear test battery comprising audiometry, caloric test, and oVEMP and cVEMP tests.
  
  
  RESULTS
  The mean interval from initial sudden deafness to vertiginous attack in group A was 8 years, with a mean hearing level of 66 ± 20 dB, which did not significantly differ from 61 ± 20 dB in group B. For the vestibular test results, the percentages of abnormal cVEMP, oVEMP, and caloric tests in group A were 65%, 70%, and 25%, respectively. Compared to the respective 70%, 60%, and 75% abnormalities in group B, only the caloric test differed significantly.
authors.affiliation: Department of Otolaryngology, Far Eastern Memorial Hospital , Taipei.
authors.forename: Tsung-Yi
authors.initials: TY
authors.lastname: Cho
authors.forename: Po-Wen
authors.initials: PW
authors.lastname: Cheng
authors.forename: Yi-Ho
authors.initials: YH
authors.lastname: Young
mesh_terms: D000328:Adult; D000368:Aged; D001299:Audiometry / Q000379:methods; D002150:Caloric Tests; D018159:Endolymphatic Hydrops / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D005260:Female; D005500:Follow-Up Studies; D003639:Hearing Loss, Sudden / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D058585:Vestibular Evoked Myogenic Potentials; D014722:Vestibule, Labyrinth / Q000503:physiopathology*