title: Standardization of brainstem auditory evoked potential using a new device.
abstract: BACKGROUND
  Standardization of Brainstem Auditory Evoked Potential (BAEP) using a new device.
  
  
  OBJECTIVE
  To standardize BAEP responses using a new device developed (NDD) in Brazil.
  
  
  METHODS
  Analysis of absolute latencies, interpeaks and wave amplitudes of BAEP, using a new device developed to study normal-hearing groups (91 adults) and individuals (15 adults) with bilateral neurosensory hearing loss. Responses obtained in the EP15 hearing device/Interacoustics and the NDD were compared. For this, the following paramenters were used: non-filtered click of 100 microsecond (µs), totaling 2000 stimuli in rarefied polarity, stimulation frequency of 13.1 clicks/s, intensity of 80 decibels normalized hearing level (dB nHL), with a window of 10 milliseconds and bandpass filter between 100 and 3000 Hertz (Hz). Significance level was set at 0.05.
  
  
  RESULTS
  Absolute latency and interpeak means for 76 normal-hearing individuals with the NDD were: wave I=1.50, III=3.57, V=5.53, I-III=2.06, III-V=1.96 and I-V=4.02. When analyzing results according to gender, there was a statistically significant difference for the absolute latencies of waves III and V and in interpeaks I-III and I-V. Mean amplitude value of wave I=0.384 microvolt (µV) and of wave V=0.825 µV. There was no statistically significant difference between the absolute latencies and interpeaks of the two devices in the same individual.
  
  
  CONCLUSIONS
  The components of BAEP with the NDD in normal-hearing subjects were similar regarding the tested ears, with statistically lower latencies in women. The BAEP latencies in the same individual with NDD were similar to those obtained with the EP15 / Interacoustics. Normal values of BAEP were obtained in normal-hearing adults.
authors.affiliation: Departamento de Fonoaudiologia, Universidade Federal de São Paulo. ilkaamaralsoares@gmail.com
authors.forename: Ilka do Amaral
authors.initials: Ido A
authors.lastname: Soares
authors.forename: Pedro de Lemos
authors.initials: Pde L
authors.lastname: Menezes
authors.forename: Aline Tenório Lins
authors.initials: AT
authors.lastname: Carnaúba
authors.forename: Liliane Desgualdo
authors.initials: LD
authors.lastname: Pereira
mesh_terms: D000293:Adolescent; D000328:Adult; D001300:Audiometry, Evoked Response / Q000295:instrumentation* / Q000379:methods / Q000592:standards; D001309:Auditory Threshold / Q000502:physiology; D001938:Brazil; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012015:Reference Standards; D015203:Reproducibility of Results; D012737:Sex Factors; D018709:Statistics, Nonparametric; D055815:Young Adult