Longitudinal development of wideband reflectance tympanometry in normal and at-risk infants

Lisa L. Hunter, Douglas H Keefe, M. Patrick Feeney, Denis F. Fitzpatrick, Li Lin

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Purpose: The goals of this study were to measure normal characteristics of ambient and tympanometric wideband acoustic reflectance, which was parameterized by absorbance and group delay, in newborns cared for in well-baby and Neonatal Intensive Care Unit (NICU) nurseries, and to characterize the normal development of reflectance over the first year after birth in a group of infants with clinically normal hearing status followed longitudinally from birth to one year of age. Methods: Infants were recruited from a well-baby and NICU nursery, passed newborn otoacoustic emissions (OAE) and automated auditory brainstem response (ABR) tests as well as follow-up diagnostic ABR and audiometry. They were tested longitudinally for up to one year using a wideband middle ear acoustic test battery consisting of tympanometry and ambient-pressure tests. Results were analyzed for ambient reflectance across frequency and tympanometric reflectance across frequency and pressure. Results: Wideband absorbance and group delay showed large effects of age in the first 6 months. Immature absorbance and group delay patterns were apparent in the low frequencies at birth and one month, but changed substantially to a more adult-like pattern by age 6 months for both ambient and tympanometric variables. Area and length of the ear canal estimated acoustically increased up to age 1 year. Effects of race (African American and others compared to Caucasian) were found in combination with age effects. Mean and confidence intervals are provided for use as a normative longitudinal database for newborns and infants up to one year of age, for both well-baby and NICU infants.

Original languageEnglish (US)
JournalHearing Research
DOIs
StateAccepted/In press - Sep 1 2015

Fingerprint

Acoustic Impedance Tests
Neonatal Intensive Care Units
Brain Stem Auditory Evoked Potentials
Nurseries
Parturition
Newborn Infant
Acoustics
Pressure
Audiometry
Ear Canal
Middle Ear
African Americans
Hearing
Databases
Confidence Intervals

Keywords

  • Development
  • Middle ear
  • Newborn screening
  • Reflectance
  • Tympanometry

ASJC Scopus subject areas

  • Sensory Systems

Cite this

Longitudinal development of wideband reflectance tympanometry in normal and at-risk infants. / Hunter, Lisa L.; Keefe, Douglas H; Feeney, M. Patrick; Fitzpatrick, Denis F.; Lin, Li.

In: Hearing Research, 01.09.2015.

Research output: Contribution to journalArticle

Hunter, Lisa L. ; Keefe, Douglas H ; Feeney, M. Patrick ; Fitzpatrick, Denis F. ; Lin, Li. / Longitudinal development of wideband reflectance tympanometry in normal and at-risk infants. In: Hearing Research. 2015.
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