title: Wideband reflectance in newborns with present transient-evoked otoacoustic emissions.
abstract: OBJECTIVE
  To characterize the normal values of acoustic energy reflectance obtained with pure-tone stimulation in neonates prior to hospital discharge.
  
  
  METHODS
  Seventy-seven infants (37 girls and 40 boys) were evaluated by measuring acoustic reflectance using pure-tone stimuli, transient-evoked otoacoustic emissions, and tympanometric probe frequencies of 226 Hz and 1 kHz.
  
  
  RESULTS
  At low frequencies (258-750 Hz), greater energy reflectance was observed, while at medium frequencies (1-3 kHz), greater energy absorption was observed. There was no difference between ears or between genders.
  
  
  CONCLUSIONS
  Normal energy reflectance values were obtained for the studied population. The data indicate a reflectance curve with a distinct configuration for the studied age.
authors.forename: Kilza Arruda de Lyra e
authors.initials: KA
authors.lastname: Silva
authors.forename: Juliana Granja
authors.initials: JG
authors.lastname: Urosas
authors.forename: Seisse Gabriela Gandolfi
authors.initials: SG
authors.lastname: Sanches
authors.forename: Renata Mota Mamede
authors.initials: RM
authors.lastname: Carvallo
mesh_terms: D000158:Acoustic Impedance Tests; D000161:Acoustic Stimulation / Q000379:methods*; D001301:Audiometry, Pure-Tone; D004432:Ear, Middle / Q000502:physiology*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D015997:Neonatal Screening / Q000379:methods; D017084:Otoacoustic Emissions, Spontaneous / Q000502:physiology*; D012016:Reference Values