title: Auditory brainstem responses to CE-Chirp® stimuli for normal ears and those with sensorineural hearing loss.
abstract: OBJECTIVE
  Evaluation of the characteristic differences between click-and CE-Chirp-evoked auditory brainstem responses (ABRs) in normal hearing and sensorineural hearing loss.
  
  
  METHODS
  A prospective study. Ears with normal hearing and with sensorineural hearing loss were evaluated. Pure-tone audiometry and click-and CE-Chirp evoked ABRs exams were conducted for all ears. Visual detection levels, wave-V amplitudes, and latencies of the ABRs were assessed.
  
  
  METHODS
  Twenty-two ears with normal hearing and 22 ears with sloping type sensorineural hearing loss were examined.
  
  
  RESULTS
  In normal-hearing ears, mean amplitudes were larger for CE-chirps than for clicks at all intensities until 80 dB nHL, at which the amplitudes dropped off, presumably due to upward spread of excitation. In ears with sensorineural hearing loss, however the drop-off was less significant at 80 dB nHL. Comparisons with pure-tone audiometry findings revealed ABRs to CE-Chirps to correlate at 0.5, 1, 2, and 3 kHz, and to clicks at 1, 2, 3, and 4 kHz.
  
  
  CONCLUSIONS
  The CE-Chirp has advantages over clicks for examining normal ears. However, under high-level stimulation, these advantages are no longer present. In ears with sensorineural hearing loss, the upward spread of excitation is less prominent. The CE-Chirps results correlate significantly to low frequency audiometric findings at 0.5 kHz, while clicks do not.
authors.affiliation: a * Department of Otolaryngology , Seoul National University College of Medicine , Seoul , Korea.
authors.forename: Sung-Woo
authors.initials: SW
authors.lastname: Cho
authors.affiliation: a * Department of Otolaryngology , Seoul National University College of Medicine , Seoul , Korea.|b Department of Otorhinolaryngology , National Medical Center , Seoul , Korea.
authors.forename: Kyu-Hee
authors.initials: KH
authors.lastname: Han
authors.affiliation: a * Department of Otolaryngology , Seoul National University College of Medicine , Seoul , Korea.
authors.forename: Hyun-Kyung
authors.initials: HK
authors.lastname: Jang
authors.affiliation: a * Department of Otolaryngology , Seoul National University College of Medicine , Seoul , Korea.|c Department of Otorhinolaryngology , Kangbuk Samsung Hospital , Seoul , Korea.
authors.forename: Sun O
authors.initials: SO
authors.lastname: Chang
authors.affiliation: a * Department of Otolaryngology , Seoul National University College of Medicine , Seoul , Korea.
authors.forename: Hyunseo
authors.initials: H
authors.lastname: Jung
authors.affiliation: a * Department of Otolaryngology , Seoul National University College of Medicine , Seoul , Korea.
authors.forename: Jun Ho
authors.initials: JH
authors.lastname: Lee
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods*; D000368:Aged; D000369:Aged, 80 and over; D001301:Audiometry, Pure-Tone / Q000379:methods*; D001307:Auditory Perception; D001309:Auditory Threshold; D001933:Brain Stem / Q000503:physiopathology*; D016022:Case-Control Studies; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis* / Q000503:physiopathology / Q000523:psychology; D006801:Humans; D008297:Male; D008875:Middle Aged; D019986:Persons with Hearing Disabilities / Q000523:psychology*; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012815:Signal Processing, Computer-Assisted
keywords: Auditory brainstem response; CE-Chirp; click; normal hearing; sensorineural hearing loss