title: Analysis of otoacoustic emissions in neonates at term and preterm.
abstract: The transient evoked otoacoustic emissions (TEOAEs) have been widely used in neonatal hearing screening.
  
  
  OBJECTIVE
  To compare the TEOAEs in newborns at term and preterm vis-à-vis the following variables: ear side, gender, frequency spectrum and gestational age.
  
  
  METHODS
  By means of a cross-sectional cohort of 66 newborns up to the 28th day of life (41 newborns at term and 25 premature babies), we recorded TEOAEs. All the individuals did not have risk indicators for hearing loss.
  
  
  RESULTS
  There was a signal/noise ratio improvement with frequency increase. No differences were observed between genders and between the ears, but there were differences among the children born at term and preterm in the frequency bands at 3 kHz and 4 kHz.
  
  
  CONCLUSIONS
  The TEOAEs test is important for assessing the peripheral auditory system of newborns at term and preterm, making it possible to have responses regardless of gender and gestational age.
authors.affiliation: Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo.
authors.forename: Juliana Maria Soares
authors.initials: JM
authors.lastname: Cavalcante
authors.forename: Myriam de Lima
authors.initials: Mde L
authors.lastname: Isaac
mesh_terms: D000161:Acoustic Stimulation; D003430:Cross-Sectional Studies; D005260:Female; D005865:Gestational Age; D006320:Hearing Tests / Q000379:methods; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature / Q000502:physiology*; D008297:Male; D015997:Neonatal Screening / Q000379:methods*; D017084:Otoacoustic Emissions, Spontaneous / Q000502:physiology*; D011446:Prospective Studies; D011930:Reaction Time; D047929:Term Birth