Document Detail

Ear-canal wideband acoustic transfer functions of adults and two- to nine-month-old infants.
MedLine Citation:
PMID:  20517155     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: Wideband acoustic transfer functions (WATF) measured in the ear canal have been shown to be effective in the diagnosis of middle ear dysfunction in adults and in newborn infants. Although these measures would be diagnostically useful in older infants, normative data on a large number of older infants are lacking. The goal of this study was to provide such normative data.
DESIGN: The WATF of 458 infants aged 2 to 9 mos and of 210 adults were obtained. Wideband reactance (X), resistance (R), and energy reflectance (ER) were measured in third-octave bands between 250 and 8000 Hz. The effects of age and gender on the WATF were examined, and the WATF in the left and right ears were compared. Test-retest reliability was assessed, and the relationship between the 226-Hz tympanogram and the WATF was examined.
RESULTS: The results agreed well with previous reports testing fewer subjects, which documented age-related change in these measures during infancy and between infancy and adulthood. Test-retest correlations within third octaves were 0.5 to 0.7 at best, but did not vary systematically with age. Infants' test-retest absolute differences within third octaves for R and ER were similar to those of adults. The shape of the WATF on retest was highly repeatable, and the shapes of the WATF in the ears of the same individual were qualitatively similar. The wideband impedance results were not different in the left and right ears, but ER was slightly, but significantly, lower in the left ear than that in the right ear. Resistance and reactance magnitude were greater for females than males, but there was no effect of gender on ER. Infants whose 226-Hz tympanogram indicated reduced peak admittance (Types As and B) had greater resistance and reactance magnitude than those with normal peak admittance (Types A and C), but no tympanometry group differences were evident in ER.
CONCLUSIONS: Age-graded norms are essential to the successful clinical application of WATF. However, the effects of gender and laterality on the WATF are small.
Lynne A Werner; Ellen C Levi; Douglas H Keefe
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Validation Studies    
Journal Detail:
Title:  Ear and hearing     Volume:  31     ISSN:  1538-4667     ISO Abbreviation:  Ear Hear     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-09-02     Completed Date:  2011-01-04     Revised Date:  2013-04-25    
Medline Journal Info:
Nlm Unique ID:  8005585     Medline TA:  Ear Hear     Country:  United States    
Other Details:
Languages:  eng     Pagination:  587-98     Citation Subset:  IM    
Department of Speech and Hearing Sciences, University of Washington, Seattle, Washington 98105-6246, USA.
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MeSH Terms
Acoustic Impedance Tests
Acoustic Stimulation / methods
Age Factors
Ear Canal / physiology*
Ear, Middle / physiology*
Hearing Disorders / diagnosis*,  physiopathology
Hearing Tests / methods*,  standards*
Reproducibility of Results
Sex Factors
Young Adult
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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