Medidas de absorvância acústica por meio da timpanometria de banda larga em crianças até 3 anos de idade

• Autor(a) principal: Santos, Mary Ellen dos
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da PUC_SP
• Texto Completo: https://tede2.pucsp.br/handle/handle/18958
• topic: Testes de impedância acústica; Testes auditivos; Timpanometria de Banda Larga; Acoustics impedance test; Hearing test; Wideband tympanometry; CNPQ::CIENCIAS DA SAUDE::FONOAUDIOLOGIA

Introduction: The Wideband Tympanometry (WBT), with acoustic absorbance measures, is a recently introduced procedure in audiology, and its diagnostic comprehensiveness is still little explored. This is a technique that provides dynamic measurements of acoustic absorbance of the middle ear (ME), which increases the possibilities of studying anatomical and functional variables of this structure in children. It also measures all tympanograms from 226 Hz to 8000 Hz and identifies the resonance frequency of ME in an only and fast stimulus, using the same classical tympanometry procedure. Objective: To evaluate the Wideband Tympanometry with acoustic absorbance measures associated with the hearing status in children up to 3 years of age. Method: This is a descriptive, observational, retrospective and quantitative approach, accomplished through the use of WBT, with acoustic absorbance measurements and chirp stimuli in children up to 3 years old. We studied 81 medical records of patients of both sexes, of which only twenty-four completed the diagnosis, with normal tests, slight conductive alterations, or conductive hearing loss. Results: The results show important statistics differences of the broaband absorbance between the ears of same hearing status groups. Statistical analysis showed that the group with normal hearing tends to have higher means and medians of acoustic resonance and absorbance than the groups with slight conductive alterations and conductive hearing loss. However, it was observed that at frequencies below 0.5 kHz was not practically significant difference in the average absorbance between the acoustic group with normal hearing and the other groups aged ≥ 7 months. The group's results with normal hearing showed further that the means and medians absorbance changed systematically till the frequency of 6168.84 Hz. Conclusions: This study demonstrated, in general, the values of absorbance of broadband energy group with normal hearing were higher than the group with mild conductive hearing disorders and hearing loss, regardless of age. However, for it’s clinical practice becomes effective, it is recommended to establish normality patterns