title: [The influence of high frequency hearing loss on the distortion product otoacoustic emissions in tinnitus subjects with normal hearing threshold (0,25-8 kHz)].
abstract: OBJECTIVE
  To evaluate the influence of high frequency hearing loss (> 8000 Hz) on distortion product otoacoustic emissions registered in the frequency range from 0,5 to 8 kHz.
  
  
  METHODS
  280 ears with tinnitus and normal hearing (0.25-8 kHz) divided into 3 groups depending on the degree of high frequency hearing loss: group A--hearing threshold up to 20 dB for 10, 12.5, 14 and 16 kHz (68 ears); group B--hearing threshold 25-40 dB HL for at least one of four EHfs (93 ears); group C--hearing threshold above 40 dB HL for at least one of four EHFs (119 ears). For each group mean audiogram and DP-gram were obtained and statistical analysis was used for comparison across these groups.
  
  
  RESULTS
  Mean DPOAE values in group C were significantly lower in comparison with group A for the frequency range 2-8 kHz, and in comparison with group B were significantly lower for the frequency range 4-8 kHz.
  
  
  CONCLUSIONS
  High frequency hearing loss (above 8 kHz) has a relevant influence on distortion product otoacoustic emissions registered at frequencies below 8 kHz in tinnitus patients. The greater is hearing loss above 8 kHz, the lower is DPOAE value below 8 kHz.
authors.affiliation: Instytut Fizjologii i Patologii Słuchu, Poland. a.fabijanska@ifps.org.pl
authors.forename: Anna
authors.initials: A
authors.lastname: Fabijańska
authors.forename: Jacek
authors.initials: J
authors.lastname: Smurzyński
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Kochanek
authors.forename: Grażyna
authors.initials: G
authors.lastname: Bartnik
authors.forename: Danuta
authors.initials: D
authors.lastname: Raj-Koziak
authors.forename: Henryk
authors.initials: H
authors.lastname: Skarżyński
mesh_terms: D000328:Adult; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D005260:Female; D006316:Hearing Loss, High-Frequency / Q000175:diagnosis / Q000453:epidemiology* / Q000503:physiopathology*; D006801:Humans; D008297:Male; D017084:Otoacoustic Emissions, Spontaneous; D014012:Tinnitus / Q000175:diagnosis / Q000453:epidemiology* / Q000503:physiopathology*