title: Hearing outcomes of vestibular schwannoma patients managed with 'wait and scan': predictive value of hearing level at diagnosis.
abstract: OBJECTIVE
  This study aimed to evaluate the predictive value of both hearing level (at various frequencies) and speech discrimination for forecasting hearing outcome after a period of observation, in patients with vestibular schwannoma.
  
  
  METHODS
  Over a 33-year period, 1144 patients with vestibular schwannoma were allocated to 'wait and scan' management, with annual magnetic resonance imaging and audiological examination. Two complete pure tone and speech discrimination audiograms were available for 932 patients.
  
  
  RESULTS
  The predictive value of initial hearing level better than 10 dB for forecasting hearing outcome after observation increased from 59 per cent at 250 Hz to 94 percent at 4000 Hz. At diagnosis, hearing level of 10 dB or better at 4000 Hz was found in only 18 of the 932 VS ears, while good speech discrimination was found in 159 patients (17 per cent). Of the latter patients, 138 maintained good hearing after observation.
  
  
  CONCLUSIONS
  In vestibular schwannoma patients, good high frequency hearing and good speech discrimination at diagnosis are useful tools in predicting good hearing after observation.
authors.affiliation: ENT Department, Gentofte University Hospital, Copenhagen, Denmark. stangerup@pc.dk
authors.forename: S-E
authors.initials: SE
authors.lastname: Stangerup
authors.forename: M
authors.initials: M
authors.lastname: Tos
authors.forename: J
authors.initials: J
authors.lastname: Thomsen
authors.forename: P
authors.initials: P
authors.lastname: Caye-Thomasen
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001301:Audiometry, Pure-Tone / Q000379:methods; D005260:Female; D006311:Hearing Disorders / Q000209:etiology* / Q000523:psychology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000150:complications* / Q000523:psychology; D011379:Prognosis; D013063:Speech Discrimination Tests / Q000379:methods; D013067:Speech Perception; D055815:Young Adult