Swanepoel, De WetWerner, SoniaHugo, RenéLouw, BrendaOwen, RinaSwanepoel, Andre2008-06-062008-06-062007Swanepoel, D, Werner, S, Hugo, R, Louw, B, Owen, R, Swanepoel, A 2007, 'High frequency immittance for neonates: a normative study', Acta Oto-Laryngologica, vol. 127, no. 1, pp. 49-56. [http://www.tandf.co.uk/journals/titles/00016489.asp]0001-648910.1080/00016480600740563http://hdl.handle.net/2263/5824CONCLUSION: High frequency immittance measurements demonstrate promise in clarifying middle ear status for neonates but age- and gender-specific norms should be consulted. OBJECTIVE: To describe high frequency immittance measurements using a 1000 Hz probe tone for a sample of 278 neonatal ears (0-4 weeks of age) in order to compile normative tympanometric and acoustic reflex criteria. SUBJECTS AND METHODS: Assessment of neonatal ears included 1000 Hz probe tone immittance measurements (tympanograms and ipsilateral acoustic reflexes), and distortion product oto-acoustic emission (DPOAE) screening. Results were compared and normative values were compiled for immittance measures in ears controlled for normal middle ear functioning (n=250). RESULTS: Comparison of immittance results to OAE screening outcome provides estimates of sensitivity and specificity for middle ear fluid with tympanometry of 57% and 95%, and 57% and 90% for acoustic reflex presence, and 58% and 87% for combined tympanogram and acoustic reflex results, respectively. Normative data indicate that static peak admittance values differ significantly across gender and age with the 5th percentile cut-off value for the entire sample at 1.4 mmho. The 90% range of tympanic peak pressure normative values increases with increasing age from 140 daPa for neonates 1 week of age to 210 daPa for neonates 2-4 weeks of age. Acoustic reflexes were elicited at 93±9 dB with a 90% normality range of 80-105 dB.152226 bytesapplication/pdfenTaylor & FrancisHigh frequency probe toneImmittanceMiddle ear fluidMiddle ear effusionNeonatal hearing screeningStatic peak admittanceTympanic peak pressureTympanometryAcoustic reflexMiddle earNewborn infantsOtoacoustic emissionsAudiometryArticle