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J Am Acad Audiol 2000; 11(02): 97-102
DOI: 10.1055/s-0042-1748016
Original Article

Developmental Changes in Aural Acoustic Admittance Measurements

Albert R. De Chicchis
Department of Communication Sciences and Disorders, The University of Georgia, Athens, Georgia
,
N. Wendell Todd
Department of Otolaryngology, Emory University, Atlanta, Georgia
,
Robert J. Nozza
Department of Communication Sciences and Disorders, The University of Georgia, Athens, Georgia
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Abstract

Tympanometry is a clinical measurement routinely included in the assessment of middle ear function. Despite its widespread use, however, fundamental questions remain regarding the need for age-dependent normative data. This study examines normal developmental changes associated with four tympanometric measurements: (1) ear canal volume, (2) peak compensated acoustic admittance, (3) tympanometric width, and (4) tympanometric peak pressure. Of 221 infants and children, aged 6 months to 5 years, enrolled in this study, 99 met the criteria for normal middle ear function as determined via pneumatic tympanoscopy by an experienced pediatric otolaryngologist, and data analysis was confined to those 99 volunteers. Analysis of variance revealed statistically significant main effects showing increases in ear canal volume and peak compensated acoustic admittance and decreases in tympanometric width as age increased. Statistically significant differences were not achieved for tympanometric peak pressure. Although statistically significant differences were found, the differences were small and of questionable clinical significance.

Abbreviations: HSD = Honestly Significant Difference test, TPP = tympanometric peak pressure, TW = tympanometric width, Veq = equivalent volume, Ytm = peak compensated acoustic admittance

Key Words

Ear canal volume - peak compensated acoustic admittance - tympanometric peak pressure - tympanometric width


Publication History

Article published online:
06 April 2022

© 2000. American Academy of Audiology. This article is published by Thieme.

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  • REFERENCES

  • American National Standards Institute. (1987). American National Standard Specifications for Instruments to Measure Aural Acoustic Impedance and Admittance (Aural Acoustic Immittance). ANSI S3.39-1987. New York: ANSI.
  • American Speech-Language-Hearing Association. (1990). Guidelines for screening for hearing impairments and middle ear disorders. ASHA 34(Suppl 2):17–24.
  • American Speech-Language-Hearing Association. (1995). Ad hoc committee on screening for hearing impairment, handicap and middle ear disorders. Am J Audiol 4:24–40.
  • Brooks DN. (1968). An objective method of determining fluid in the ear. Int Audiol 7:280–286.
  • de Jonge R. (1983). Normal tympanogram slope. ASHA 25:114.
  • de Jonge R. (1986). Normal tympanometric gradient: a comparison of three methods. Audiology 25:299–308.
  • Fiellau-Nikolajsen M. (1983). Tympanometry and secretory otitis media. Acta Otolaryngol Suppl 394:1–73.
  • Holte L, Margolis RH, Cavanaugh RM. (1991). Developmental changes in multifrequency tympanograms. Audiology 30:1–24.
  • Jerger J. (1970). Clinical experience with impedance audiometry. Arch Otolaryngol 92:311–324.
  • Jerger J, Jerger S, Mauldin L, Segal P. (1974). Studies in impedance audiometry: II: children less than 6 years old. Arch Otolaryngol 99:165–171.
  • Koebsell KA, Margolis RJ. (1986). Tympanometric gradient measured from normal preschool children. Audiology 25:149–157.
  • Margolis RH, Heller JW. (1987). Screening tympanometry: criteria for medical referral. Audiology 26:197–208.
  • Nozza RJ, Bluestone CD, Kardatzke D, Bachman R. (1992). Towards the validation of aural acoustic measures for the diagnosis of middle ear effusion. Ear Hear 13:442–453.
  • Nozza RJ, Bluestone CD, Kardatzke D, Bachman R. (1994). Identification of middle ear effusion by aural acoustic admittance and otoscopy. Ear Hear 15:310–323.
  • Orchik DJ, MorffR, Dunn J. (1978). Impedance audiometry in serous otitis media. Arch Otolaryngol 104:409–412.
  • Paradise J, Smith CG, Bluestone CD. (1976). Tympanometric detection of middle ear effusion in infants and young children. Pediatrics 58:198–210.
  • Roush J, Bryant K, Mundy M, Zeisel S, Roberts J. (1995). Developmental changes in static admittance and tympanometric width in infants and toddlers. J Am Acad Audiol 6:334–338.
  • Shanks JE, Lilly DH. (1981). An evaluation of tympanometric estimates of ear canal volume. J Speech Hear Res 24:557–566.
  • Shanks JE, Wilson RH. (1986). Effects of direction and rate of ear-canal pressure changes on tympanometric measures. J Speech Hear Res 29:11–19.