Comparison of the results of the otoacoustic emission tests and tympanometry tests: should we revise the neonatal hearing screening protocol?
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Abstract
Introduction: the high incidence of middle ear alterations in newborns causes increased frequency of falsely altered results in otoacoustic emission tests. Objective: to correlate the responses of transient evoked otoacoustic emissions with the results obtained with 226Hz and 1,000Hz tympanometry in newborns admitted to the Neonatal Unit. Methods: prospective study on newborns in the neonatal unit who were submitted to 226Hz and 1,000Hz tympanometry and tran
sient evoked otoacoustic emissions. Tympanometric curves were classified as normal (A and Double Peak) or changed (Ad, As, B, C). The sample was described by absolute and relative frequencies, and the correlation between the results of the examinations was established by chi-square test and logistic regression, considering the significance of 95%, using the statistical package SPSS 16.0. Results: 137 of the 172 infants admitted to the neonatal unit met the inclusion criteria, totaling 274 ears. Of this, 22 had transient evoked otoacoustic emissions changed, 14 tympanometry with 226Hz probe and 18 with 1,000Hz probe. The correlation between both altered transient evoked otoacoustic emissions and 226Hz tympanometry in the first examination showed OR = 44 (95%: 11.75 – 166.81, p < 0.001); with 1,000Hz tympanome try, the correlation presented OR = 829 (CI 95%: 100.2 – 6,879.17; p < 0.001). Conclusions: there was a better correlation between the results of otoacoustic emissions with 1,000Hz tympanometry in the population studied.
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