title: Using the Glasgow Benefit Plot as a prognostic instrument and for preoperative counseling in patients with otosclerosis.
abstract: OBJECTIVE
  The Glasgow Benefit Plot (GBP) is a graph showing the pure-tone thresholds preoperatively and postoperatively, and is meant to visualize the possible outcome of binaural hearing for individual patients. We used our database comprising a large number of patient data to test the usefulness of the GBP.
  
  
  METHODS
  Evaluation based on retrospective clinical data.
  
  
  METHODS
  Tertiary referral center, University clinic.
  
  
  METHODS
  Audiometric assessment included bilateral preoperative and postoperative evaluation using conventional audiometry. Three preoperative groups (unilateral, asymmetric, and symmetric hearing impairment) were split into 6 postoperative categories in the GBP diagram.
  
  
  RESULTS
  Considering the 509 operations, including 34 bilateral operations, the total outcome was distributed as follows: 34% resulted in bilateral normal hearing, 24% unilateral normal hearing (in operated ear), 14% still unilateral hearing impairment (in operated ear), 13% symmetric hearing impairment, 10% asymmetric hearing impairment (operated ear best), 5% still asymmetric hearing impairment (nonoperated ear best). The distribution of outcomes depended in part on the bone conduction level in the operated ear and in part on the hearing status in the contralateral ear.
  
  
  CONCLUSIONS
  The GBP is a useful instrument that provides a means for judging the binaural hearing status. However, the outcome of stapes surgery for individual persons and for a group depends critically on the preoperative audiometric criteria for patients who are chosen for surgery. In cases of depressed bone conductions, the method does not indicate the upper limit for possible hearing improvement. A number of patients with combined hearing impairments were included in the present study population. In preoperative counseling, the GBP must be complemented with information with regard to the limitation of possible hearing improvement owing to the individual bone conduction level.
authors.affiliation: Department of Otorhinolaryngology, University Hospital, Linköping, Sweden. pekka.persson@lio.se
authors.forename: Pekka
authors.initials: P
authors.lastname: Persson
authors.forename: Henrik
authors.initials: H
authors.lastname: Harder
authors.forename: Bengt
authors.initials: B
authors.lastname: Magnuson
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001299:Audiometry; D001309:Auditory Threshold / Q000502:physiology; D001844:Bone Conduction / Q000502:physiology; D003376:Counseling; D019992:Databases as Topic; D005260:Female; D017408:Guidelines as Topic; D006801:Humans; D008297:Male; D008875:Middle Aged; D010040:Otosclerosis / Q000601:surgery*; D011379:Prognosis; D012189:Retrospective Studies; D013201:Stapes Surgery; D016896:Treatment Outcome