{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,28]],"date-time":"2025-09-28T11:15:09Z","timestamp":1759058109553},"reference-count":45,"publisher":"Georg Thieme Verlag KG","issue":"02","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int Arch Otorhinolaryngol"],"published-print":{"date-parts":[[2012,4]]},"abstract":"<jats:title>Summary<\/jats:title><jats:p>\n          Introduction:\u2003The use of conventional tympanometry is not sufficiently sensitive to detect all cases of middle ear changes, and this hinders accurate diagnosis.<\/jats:p><jats:p>\n          Objective:\u2003To characterize acoustic immittance measures of infants from 0 to 3 months of age using multifrequency tympanometry in a prospective study.<\/jats:p><jats:p>\n          Method:\u200354 infants from 0 to 3 months of age were evaluated. The inclusion criteria included absence of respiratory infections during the evaluation, presence of transient evoked otoacoustic emissions, and absence of risk indicators for hearing loss. The subjects were evaluated by an audiologic interview, a visual inspection of the ear canal, and measures of acoustic immittance at the frequencies of 226\u2009Hz, 678\u2009Hz, and 1,000 Hz. Tympanometric records of the occlusion effect, tympanometric curve type, tympanometric peak pressure, equivalent ear canal volume, and peak compensated static acoustic admittance were collected.<\/jats:p><jats:p>\n          Results:\u2003The results indicated the presence of an occlusion effect (2.88% at 226\u2009Hz, 4.81% at 678\u2009Hz and 3.85% at 1,000 Hz), predominance of a tympanometric curve with a single peak (65.35% at 226\u2009Hz, 81.82% at 678\u2009Hz, and 77.00% at 1,000 Hz), and tympanometric peak pressure ranging from -155 to 180 daPa. Further, the equivalent ear canal volume increased with the frequency of the probe (0.64 mL at 226\u2009Hz, 1.63 mho at 678\u2009Hz, and 2.59 mmho at 1,000 Hz) and the peak compensated static acoustic admittance values increased with an increase in frequency (0.51 mL at 226\u2009Hz, 0.55 mmho at 678\u2009Hz and 1.20 mmho at 1,000 Hz). 93.06% of the tympanograms were classified as normal at 226\u2009Hz, 81.82% at 678\u2009Hz, and 77.00\u2009% at 1,000\u2009Hz, respectively.<\/jats:p><jats:p>\n          Conclusion:\u2003Taken together, these results demonstrated that utilizing these evaluations made it possible to characterize the acoustic immittance measures of infants.<\/jats:p>","DOI":"10.7162\/s1809-97772012000200006","type":"journal-article","created":{"date-parts":[[2012,5,4]],"date-time":"2012-05-04T17:54:15Z","timestamp":1336154055000},"page":"186-194","source":"Crossref","is-referenced-by-count":5,"title":["Multifrequency tympanometry in infants"],"prefix":"10.1055","volume":"16","author":[{"given":"Camila de C\u00e1ssia","family":"Macedo","sequence":"first","affiliation":[{"name":"Master of Rehabilitation Science.Student for Post-Graduation Program of Rehabilitation Craniofacial Anomalies Hospital of Universidade de S\u00e3o Paulo\/Sao Paulo University."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mariza Ribeiro","family":"Feniman","sequence":"first","affiliation":[{"name":"Entitled Professor. Entitled Professor for Speech Therapy Department FOB\/USP."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tamyne Ferreira Duarte","family":"de Moraes","sequence":"additional","affiliation":[{"name":"Master of Science. Resident Speech Therapist for Multidisciplinary Residency Program of Rehabilitation Craniofacial Anomalies Hospital of Universidade de S\u00e3o Paulo \/Sao Paulo University."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"194","published-online":{"date-parts":[[2013,12,5]]},"reference":[{"issue":"6","key":"ref1","doi-asserted-by":"crossref","first-page":"797","DOI":"10.1053\/hn.1999.v121.a91893","article-title":"Multiple-frequency tympanometry in children with acute otitis media","volume":"121","year":"1999","journal-title":"Otolaryngol Head Neck Surg"},{"issue":"4","key":"ref2","first-page":"354","article-title":"Working group on aural acoustic-immittance measurements committe on audiologic evaluation","volume":"53","year":"1988","journal-title":"Tympanometry. 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