title: [Study for cochlear microphonic potential test in patients with profound sensorineural hearing loss].
abstract: OBJECTIVE
  To report intraoperative round window cochlear microphonic potential test (CM) in patients with profound sensorineural deafness.
  
  
  METHODS
  Intraoperative round window CM test were performed on 40 cases with profound sensorineural deafness during cochlear implantation surgery under general anesthesia in the standard operating room. CM were compared with their reliable preoperation distortion product otoacoustic emission (DPOAE).
  
  
  RESULTS
  The CM were found in 40 patients. The rate at 0.5, 1.0, 2.0, 4.0. kHz was respectively 90%, 97.5%, 100%, 92.5%. The preoperation DPOAE were found in some frequency in 9 cases. The rate at 0.5, 1.0, 2.0, 4.0 kHz was respectively was 2.5%, 2.5%, 17.5%, 2.5%.
  
  
  CONCLUSIONS
  The elicited rate of CM was obviously higher than the one of DPOAE in the same patient with profound sensorineural deafness. The intraoperative round window CM may objectively and accurately estimate the part of cochlear function in patients with profound sensorineural deafness.
authors.affiliation: Department of Otolaryngology, Beijing Friendship Hospital of Capital Medical University, China.
authors.forename: Line
authors.initials: L
authors.lastname: Wang
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Keli
authors.initials: K
authors.lastname: Cao
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D019929:Cochlear Implantation / Q000379:methods*; D003055:Cochlear Microphonic Potentials; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000503:physiopathology*; D006801:Humans; D007223:Infant; D008297:Male; D055815:Young Adult