Abstract
To characterize the normal values of acoustic energy reflectance obtained with pure-tone stimulation in neonates prior to hospital discharge. 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. 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. Normal energy reflectance values were obtained for the studied population. The data indicate a reflectance curve with a distinct configuration for the studied age.
Highlights
characterize the normal values of acoustic energy reflectance obtained with pure-tone stimulation in neonates
There was no difference between ears
Normal energy reflectance values were obtained for the studied population
Summary
To characterize the normal values of acoustic energy reflectance obtained with pure-tone stimulation in neonates prior to hospital discharge. Médias da reflectância da energia (estímulo de tom puro) para orelha esquerda (sólido preto com círculo), orelha direita (tracejada com x) e faixa de 25 a 75% (região sombreada cinza), medidas em 77 recém-nascidos com idade entre 27 e 78 horas e em seguida, com o crescimento da frequência, houve outra diminuição da reflectância na frequência de 6 kHz para um valor próximo ao mínimo de absorção da energia acústica pelo sistema tímpano ossicular.
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