Reflectância de banda larga em recém-nascidos com presença de emissões otoacústicas evocadas por transiente

Wideband reflectance in newborns with present transient-evoked otoacoustic emissions

Resumos

OBJETIVO: Caracterizar os valores normais de reflectância da energia acústica obtidos com estímulo de tom puro na população neonatal antes da alta hospitalar. MÉTODOS: Setenta e sete recém-nascidos (37 meninas e 40 meninos) foram avaliados por meio das medidas de reflectância acústica, utilizando estímulos de tom puro, emissões otoacústicas por transientes e timpanometria com sondas de frequências de 226 Hz e 1 kHz. RESULTADOS: Nas baixas frequências (258 a 750 Hz) foi observado um valor elevado de reflectância da energia, enquanto nas médias frequências (1 a 3 kHz) obteve-se uma maior absorção da energia. Não existiu diferença entre orelhas e entre gêneros. CONCLUSÃO: Foram caracterizados os valores normais de reflectância da energia para a população estudada. Tais dados revelaram uma curva de reflectância com configuração peculiar para a idade.

Audição; Testes auditivos; Recém-nascido; Orelha média; Testes de impedância acústica

PURPOSE: 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. CONCLUSION: Normal energy reflectance values were obtained for the studied population. The data indicate a reflectance curve with a distinct configuration for the studied age.

Hearing; Hearing tests; Newborn; Ear, middle; Acoustic impedance tests

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Datas de Publicação

• Publicação nesta coleção
  08 Abr 2013
• Data do Fascículo
  2013

Histórico

• Recebido
  10 Nov 2011
• Aceito
  11 Set 2012