title: [Comparison of tone burst evoked auditory brainstem responses with different filter settings for referral infants after hearing screening].
abstract: OBJECTIVE
  Auditory brainstem responses (ABR) evoked by tone burst is an important method of hearing assessment in referral infants after hearing screening. The present study was to compare the thresholds of tone burst ABR with filter settings of 30 - 1500 Hz and 30 - 3000 Hz at each frequency, figure out the characteristics of ABR thresholds with the two filter settings and the effect of the waveform judgement, so as to select a more optimal frequency specific ABR test parameter.
  
  
  METHODS
  Thresholds with filter settings of 30 - 1500 Hz and 30 - 3000 Hz in children aged 2 - 33 months were recorded by click, tone burst ABR. A total of 18 patients (8 male/10 female), 22 ears were included.
  
  
  RESULTS
  The thresholds of tone burst ABR with filter settings of 30 - 3000 Hz were higher than that with filter settings of 30 - 1500 Hz. Significant difference was detected for that at 0.5 kHz and 2.0 kHz (t values were 2.238 and 2.217, P < 0.05), no significant difference between the two filter settings was detected at the rest frequencies tone evoked ABR thresholds. The waveform of ABR with filter settings of 30 - 1500 Hz was smoother than that with filter settings of 30 - 3000 Hz at the same stimulus intensity. Response curve of the latter appeared jagged small interfering wave.
  
  
  CONCLUSIONS
  The filter setting of 30 - 1500 Hz may be a more optimal parameter of frequency specific ABR to improve the accuracy of frequency specificity ABR for infants' hearing assessment.
authors.affiliation: Department of Otorhinolaryngology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China.
authors.forename: Wen-wen
authors.initials: WW
authors.lastname: Diao
authors.forename: Dao-feng
authors.initials: DF
authors.lastname: Ni
authors.forename: Feng-rong
authors.initials: FR
authors.lastname: Li
authors.forename: Ying-ying
authors.initials: YY
authors.lastname: Shang
mesh_terms: D000161:Acoustic Stimulation; D001300:Audiometry, Evoked Response; D001301:Audiometry, Pure-Tone / Q000379:methods*; D001309:Auditory Threshold; D002675:Child, Preschool; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male