Abstract | OBJECTIVES/HYPOTHESIS: Compare the accuracy of wideband acoustic transfer functions (WATFs) measured in the ear canal at ambient pressure to methods currently recommended by clinical guidelines for predicting middle-ear effusion (MEE). STUDY DESIGN: Cross-sectional validating diagnostic study among young children with and without MEE to investigate the ability of WATFs to predict MEE. METHODS: WATF measures were obtained in an MEE group of 44 children (53 ears; median age, 1.3 years) scheduled for middle-ear ventilation tube placement and a normal age-matched control group of 44 children (59 ears; median age, 1.2 years) with normal pneumatic otoscopic findings and no history of ear disease or middle-ear surgery. An otolaryngologist judged whether MEE was present or absent and rated tympanic-membrane (TM) mobility via pneumatic otoscopy. A likelihood-ratio classifier reduced WATF data (absorbance, admittance magnitude and phase) from 0.25 to 8 kHz to a single predictor of MEE status. Absorbance was compared to pneumatic otoscopy classifications of TM mobility. RESULTS: Absorbance was reduced in ears with MEE compared to ears from the control group. Absorbance and admittance magnitude were the best single WATF predictors of MEE, but a predictor combining absorbance, admittance magnitude, and phase was the most accurate. Absorbance varied systematically with TM mobility based on data from pneumatic otoscopy. CONCLUSIONS: Results showed that absorbance is sensitive to middle-ear stiffness and MEE, and WATF predictions of MEE in young children are as accurate as those reported for methods recommended by the clinical guidelines.
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Authors | John C Ellison, Michael Gorga, Edward Cohn, Denis Fitzpatrick, Chris A Sanford, Douglas H Keefe |
Journal | The Laryngoscope
(Laryngoscope)
Vol. 122
Issue 4
Pg. 887-94
(Apr 2012)
ISSN: 1531-4995 [Electronic] United States |
PMID | 22374909
(Publication Type: Comparative Study, Journal Article, Research Support, N.I.H., Extramural)
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Copyright | Copyright © 2012 The American Laryngological, Rhinological, and Otological Society, Inc. |
Topics |
- Acoustic Impedance Tests
(methods)
- Audiometry, Pure-Tone
- Auditory Threshold
(physiology)
- Child
- Child, Preschool
- Female
- Humans
- Infant
- Male
- Otitis Media with Effusion
(diagnosis, physiopathology)
- Predictive Value of Tests
- Prognosis
- ROC Curve
- Reproducibility of Results
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