title: Quantification of hearing loss in patients with posterior semicircular canal dehiscence.
abstract: CONCLUSIONS
  Patients with posterior semicircular canal dehiscence (PSCD) have low frequency conductive hearing loss similar to patients with superior semicircular canal dehiscence (SSCD) secondary to a pathologic third window.
  
  
  OBJECTIVE
  PSCD can result in conductive hearing loss, but the magnitude of this hearing loss remains to be quantified. Patients with SSCD have been shown to have low frequency conductive hearing loss. The underlying pathophysiology of hearing loss from PSCD and SSCD is similar and related to a pathologic third window.
  
  
  METHODS
  A PubMed search was completed for a meta-analysis of patients with PSCD. Articles with quality audiograms were obtained. Air conduction thresholds for ears with posterior semicircular canal dehiscence were compared to the opposite ear as well as normal control data.
  
  
  RESULTS
  Eight articles with 21 patients with PSCD and quality audiograms were included. Two patients had bilateral PSCD and one of those was excluded because hearing thresholds were at the limit of the audiometer. Patients with posterior semicircular canal dehiscence have statistically significant lower air conduction thresholds in frequencies at and below 2000 Hz.
authors.affiliation: Saint Louis University School of Medicine , Saint Louis, MO , USA.
authors.forename: Zachary W
authors.initials: ZW
authors.lastname: Bear
authors.forename: Timothy P
authors.initials: TP
authors.lastname: McEvoy
authors.forename: Anthony A
authors.initials: AA
authors.lastname: Mikulec
mesh_terms: D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold / Q000502:physiology*; D001844:Bone Conduction / Q000502:physiology; D006314:Hearing Loss, Conductive / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology; D006801:Humans; D012665:Semicircular Canals / Q000473:pathology* / Q000503:physiopathology
keywords: Hearing loss; dizziness