title: [Observation of distortion product otoacoustic emissions in recovery course of sudden deafness].
abstract: OBJECTIVE
  To realize the DPOAE resulting in sudden deafness and to investigate the changes of OAE in the recovery course of sudden deafness.
  
  
  METHODS
  The basic characters of distortion product OAE (DPOAE) were studied in 60 ears of 30 cases with sudden deafness. The treatment and following-up were carried on too.
  
  
  RESULTS
  The incidence and amplitude of OAEs in the affected ears were lower than that of normal ears and normal group, and the threshold of DPOAE was higher too. In the recovery course the amplitude and threshold of DPOAE were improved with the restoration of auditory threshold, but the restoring rate (RR) of auditory threshold was higher.
  
  
  CONCLUSIONS
  The DPOAE in sudden deafness implies a serious sensorineural hearing loss. In the recovery course, the amplitude and threshold of DPOAE is later than that of the pure-tone behavioral threshold, which implies that DPOAE is a sensitive and direct way in reflecting the function of cochlea.
authors.affiliation: Department of Otolaryngology, Gulou Hospital of Nanjing, Nanjing 210008.
authors.forename: Q
authors.initials: Q
authors.lastname: Zhang
authors.forename: Y
authors.initials: Y
authors.lastname: Deng
authors.forename: G
authors.initials: G
authors.lastname: Xing
authors.forename: Z
authors.initials: Z
authors.lastname: Cheng
mesh_terms: D000328:Adult; D001309:Auditory Threshold; D003051:Cochlea / Q000503:physiopathology; D005260:Female; D005500:Follow-Up Studies; D003639:Hearing Loss, Sudden / Q000503:physiopathology* / Q000534:rehabilitation; D006801:Humans; D008297:Male; D008875:Middle Aged; D017084:Otoacoustic Emissions, Spontaneous