Lisa L Hunter1, Douglas H Keefe2, M Patrick Feeney3, Denis F Fitzpatrick2, Li Lin4. 1. Cincinnati Children's Hospital Medical Center, USA. Electronic address: lisa.hunter@cchmc.org. 2. Boys Town National Research Hospital, USA. 3. National Center for Rehabilitative Auditory Research, USA; Oregon Health & Science University, USA. 4. Cincinnati Children's Hospital Medical Center, USA.
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.
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.
Authors: Yi-Wen Liu; Chris A Sanford; John C Ellison; Denis F Fitzpatrick; Michael P Gorga; Douglas H Keefe Journal: J Acoust Soc Am Date: 2008-12 Impact factor: 1.840
Authors: M Patrick Feeney; Lisa L Hunter; Joseph Kei; David J Lilly; Robert H Margolis; Hideko Heidi Nakajima; Stephen T Neely; Beth A Prieve; John J Rosowski; Chris A Sanford; Kim S Schairer; Navid Shahnaz; Stefan Stenfelt; Susan E Voss Journal: Ear Hear Date: 2013-07 Impact factor: 3.570
Authors: Alaaeldin M Elsayed; Lisa L Hunter; Douglas H Keefe; M Patrick Feeney; David K Brown; Jareen K Meinzen-Derr; Kelly Baroch; Maureen Sullivan-Mahoney; Kara Francis; Leigh G Schaid Journal: Ear Hear Date: 2015 Jul-Aug Impact factor: 3.570
Authors: M Patrick Feeney; Douglas H Keefe; Lisa L Hunter; Denis F Fitzpatrick; Angela C Garinis; Daniel B Putterman; Garnett P McMillan Journal: Ear Hear Date: 2017 May/Jun Impact factor: 3.570
Authors: Lisa L Hunter; Chelsea M Blankenship; Douglas H Keefe; M Patrick Feeney; David K Brown; Annie McCune; Denis F Fitzpatrick; Li Lin Journal: Ear Hear Date: 2018 Sep/Oct Impact factor: 3.570
Authors: Angela C Garinis; Alison Kemph; Anne Marie Tharpe; Joern-Hendrik Weitkamp; Cynthia McEvoy; Peter S Steyger Journal: Int J Audiol Date: 2017-06-22 Impact factor: 2.117
Authors: Chelsea M Blankenship; Lisa L Hunter; Douglas H Keefe; M Patrick Feeney; David K Brown; Annie McCune; Denis F Fitzpatrick; Li Lin Journal: Ear Hear Date: 2018 Nov/Dec Impact factor: 3.570
Authors: Lisa L Hunter; Chelsea M Blankenship; Rebekah G Gunter; Douglas H Keefe; M Patrick Feeney; David K Brown; Kelly Baroch Journal: J Am Acad Audiol Date: 2018-05 Impact factor: 1.664
Authors: Lisa L Hunter; Douglas H Keefe; M Patrick Feeney; David K Brown; Jareen Meinzen-Derr; Alaaeldin M Elsayed; Julia M Amann; Vairavan Manickam; Denis Fitzpatrick; Sally R Shott Journal: Int J Audiol Date: 2017-04-22 Impact factor: 2.117
Authors: M Patrick Feeney; Douglas H Keefe; Lisa L Hunter; Denis F Fitzpatrick; Daniel B Putterman; Angela C Garinis Journal: Ear Hear Date: 2021 May/Jun Impact factor: 3.562