transient-evoked otoacoustic emissions Reflectância de banda larga em recém-nascidos com presença de emissões otoacústicas evocadas por transiente

ABSTRACT 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 tym-panometric 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. RESUMO Objetivo: Caracterizar os valores normais de reflectância da energia acustica obtidos com estimulo de tom puro na populacao neonatal antes da alta hospitalar. Metodos: Setenta e sete recem-nascidos (37 meninas e 40 meni-nos) foram avaliados por meio das medidas de reflectância acustica, utilizando estimulos de tom puro, emissoes otoacusticas por transientes e timpanometria com sondas de frequencias de 226 Hz e 1 kHz.