PURPOSE: to assess the results found in Immittance measurements using 226 Hz and 1000 Hz in neonates without Hearing Loss Risks Indicators (HLRI) and to correlate them to Transient Evoked Otoacoustic Emissions (TOAEs) and also to study Acoustic Reflex using 226 Hz probe tones. METHODS: assessments of 52 full - term neonates, being 26 males and 26 females on an age group from 11 to 51 days of life. Anamnesis, Meatoscopy, EOAT, Tympanometry using 226 and 1000 probe tones and Ipsilateral Acoustic Reflex Research were performed. For statistical analysis of the data the following tests were applied: Wilcoxon Test and McNemar, Mann-Whitney Test, Test Qui-Square and Kruskal-Wallis ANOVA. RESULTS: data were analyzed regardless gender and ears. In relation to TOAEs, (78.8%) were found. The found tympanometric curves using 226 Hz probe tone were: A (55.8%), D (40.4%) and Ar (1%), B (2.9%); and the found ones using 1000 Hz probe tone were: A (74%), D (1%), B (14,4%) and Blocked (10.6%). According to p - value, there was a relation between Tympanometric and general reproductivity. On the sample, 81.7% of the ears indicated presence of Acoustic Reflex. CONCLUSION: tympanometric curve using 1000 Hz probe tone showed to be more adequate for detecting changes in the middle ear than 226 Hz probe tone, changes in the middle ear had influence on amplitude by frequency band and general reproductivity of TOAEs. Acoustic Reflex using 226 Hz probe tone was present in most of the neonates without HLRI.
Hearing; Infant, Newborn; Ear Middle; Acoustic Impedance Tests; Spontaneous Otoacoustic Emissions
