Achados timpanométricos em neonatos com emissões otoacústicas presentes: medidas e interpretações

Timpanometria avalia condições funcionais da orelha média. Quando realizada em neonatos abaixo de quatro meses de idade pode gerar dúvidas. Sondas de alta freqüência têm sido investigadas na busca por resultados mais confiáveis. OBJETIVO: Descrever e analisar interpretações de características e medi...

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Published in:Revista brasileira de otorrinolaringologia Vol. 73; no. 5; pp. 633 - 639
Main Authors: Silva, Kilza de Arruda Lyra e, Novaes, Beatriz de Albuquerque C. C., Lewis, Dóris Ruthi, Carvallo, Renata Mota Mamede
Format: Journal Article
Language:English
Published: 01-10-2007
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Abstract Timpanometria avalia condições funcionais da orelha média. Quando realizada em neonatos abaixo de quatro meses de idade pode gerar dúvidas. Sondas de alta freqüência têm sido investigadas na busca por resultados mais confiáveis. OBJETIVO: Descrever e analisar interpretações de características e medidas obtidas na timpanometria em neonatos com freqüências de 226, 678 e 1000Hz. MATERIAL E MÉTODO: Os 110 neonatos avaliados tinham idade entre 6 e 30 dias, não apresentaram fatores de risco e tinham emissões otoacústicas presentes. A timpanometria foi realizada com o analisador GSI-33-II, na Divisão de Educação e Reabilitação dos Distúrbios da Comunicação, São Paulo, em 2004. FORMA DE ESTUDO: Clínico prospectivo. RESULTADOS: Observou-se equilíbrio nas curvas pico único e pico duplo em 226Hz, maior ocorrência de assimétrica em 678Hz e de pico único em 1000 Hz. Houve significância de gênero na medida volume equivalente do meato acústico externo, em 226Hz, e na medida admitância acústica estática de pico compensado, em 1000Hz. O protocolo inglês apresentou quase 100% de normalidade em 678 e 1000Hz. CONCLUSÃO: A sonda de 1000Hz apresentou melhores resultados na caracterização da normalidade. O protocolo inglês mostrou-se eficiente em diminuir variabilidades das medidas. Os resultados podem ser usados como guia no diagnóstico da timpanometria. Tympanometry is used in evaluating middle ear functional conditions. Before six months of age its results may be misleading. High frequency studies aim to provide more valid procedures. AIM: To describe and discuss tympanometric measurements and the interpretation in normal hearing neonates at 226, 678 and 1000Hz. METHOD: 110 neonates that were analyzed had normal otoacoustic emissions and no risk for hearing impairment. The age range was 6 to 30 days. Curves were obtained using the GSI-33-II, at the Divisão de Educação e Reabilitação dos Distúrbios da Comunicação, São Paulo, in 2004. STUDY DESIGN: Clinical prospective. RESULTS: There was a balance between single and double peak curves at 226Hz. Most of the curves were asymmetric at 678Hz, and single-peaked at 1000Hz. quantitative measurements showed a significant gender difference in the Equivalent Ear Canal Volume at 226Hz and on the Peak Compensated Static Acoustic Admittance at 1000Hz. The English protocol showed that almost 100% of ears were normal at 678 and 1000Hz. CONCLUSION: 1000Hz yielded superior results for characterizing normality. The English protocol was efficient to reduce the variability of tympanometric measurements. Data from this study may be used as a guide for diagnosis using tympanometry in neonates.
AbstractList Timpanometria avalia condições funcionais da orelha média. Quando realizada em neonatos abaixo de quatro meses de idade pode gerar dúvidas. Sondas de alta freqüência têm sido investigadas na busca por resultados mais confiáveis. OBJETIVO: Descrever e analisar interpretações de características e medidas obtidas na timpanometria em neonatos com freqüências de 226, 678 e 1000Hz. MATERIAL E MÉTODO: Os 110 neonatos avaliados tinham idade entre 6 e 30 dias, não apresentaram fatores de risco e tinham emissões otoacústicas presentes. A timpanometria foi realizada com o analisador GSI-33-II, na Divisão de Educação e Reabilitação dos Distúrbios da Comunicação, São Paulo, em 2004. FORMA DE ESTUDO: Clínico prospectivo. RESULTADOS: Observou-se equilíbrio nas curvas pico único e pico duplo em 226Hz, maior ocorrência de assimétrica em 678Hz e de pico único em 1000 Hz. Houve significância de gênero na medida volume equivalente do meato acústico externo, em 226Hz, e na medida admitância acústica estática de pico compensado, em 1000Hz. O protocolo inglês apresentou quase 100% de normalidade em 678 e 1000Hz. CONCLUSÃO: A sonda de 1000Hz apresentou melhores resultados na caracterização da normalidade. O protocolo inglês mostrou-se eficiente em diminuir variabilidades das medidas. Os resultados podem ser usados como guia no diagnóstico da timpanometria. Tympanometry is used in evaluating middle ear functional conditions. Before six months of age its results may be misleading. High frequency studies aim to provide more valid procedures. AIM: To describe and discuss tympanometric measurements and the interpretation in normal hearing neonates at 226, 678 and 1000Hz. METHOD: 110 neonates that were analyzed had normal otoacoustic emissions and no risk for hearing impairment. The age range was 6 to 30 days. Curves were obtained using the GSI-33-II, at the Divisão de Educação e Reabilitação dos Distúrbios da Comunicação, São Paulo, in 2004. STUDY DESIGN: Clinical prospective. RESULTS: There was a balance between single and double peak curves at 226Hz. Most of the curves were asymmetric at 678Hz, and single-peaked at 1000Hz. quantitative measurements showed a significant gender difference in the Equivalent Ear Canal Volume at 226Hz and on the Peak Compensated Static Acoustic Admittance at 1000Hz. The English protocol showed that almost 100% of ears were normal at 678 and 1000Hz. CONCLUSION: 1000Hz yielded superior results for characterizing normality. The English protocol was efficient to reduce the variability of tympanometric measurements. Data from this study may be used as a guide for diagnosis using tympanometry in neonates.
Author Lewis, Dóris Ruthi
Novaes, Beatriz de Albuquerque C. C.
Silva, Kilza de Arruda Lyra e
Carvallo, Renata Mota Mamede
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