Lisa L Hunter1,2,3, Chelsea M Blankenship1,2, Douglas H Keefe4, M Patrick Feeney5,6, David K Brown1,2,7, Annie McCune2, Denis F Fitzpatrick4, Li Lin3. 1. Cincinnati Children's Hospital Medical Center, Communication Sciences Research Center, Cincinnati, Ohio, USA. 2. Departments of Otolaryngology and Communication Sciences and Disorders, University of Cincinnati, Cincinnati, Ohio, USA. 3. Cincinnati Children's Hospital Medical Center, Research in Patient Services, Cincinnati, Ohio, USA. 4. Boys Town National Research Hospital, Omaha, Nebraska, USA. 5. Portland VA Medical Center, National Center for Rehabilitative Auditory Research, Portland, Oregon, USA. 6. Department of Otolaryngology, Oregon Health and Science University, Portland, Oregon, USA. 7. Pacific University, School of Audiology, Hillsboro, Oregon, USA.
Abstract
OBJECTIVES: The purpose of this study was to describe normal characteristics of distortion product otoacoustic emission (DPOAE) signal and noise level in a group of newborns and infants with normal hearing followed longitudinally from birth to 15 months of age. DESIGN: This is a prospective, longitudinal study of 231 infants who passed newborn hearing screening and were verified to have normal hearing. Infants were enrolled from a well-baby nursery and two neonatal intensive care units (NICUs) in Cincinnati, OH. Normal hearing was confirmed with threshold auditory brainstem response and visual reinforcement audiometry. DPOAEs were measured in up to four study visits over the first year after birth. Stimulus frequencies f1 and f2 were used with f2/f1 = 1.22, and the DPOAE was recorded at frequency 2f1-f2. A longitudinal repeated-measure linear mixed model design was used to study changes in DPOAE level and noise level as related to age, middle ear transfer, race, and NICU history. RESULTS: Significant changes in the DPOAE and noise levels occurred from birth to 12 months of age. DPOAE levels were the highest at 1 month of age. The largest decrease in DPOAE level occurred between 1 and 5 months of age in the mid to high frequencies (2 to 8 kHz) with minimal changes occurring between 6, 9, and 12 months of age. The decrease in DPOAE level was significantly related to a decrease in wideband absorbance at the same f2 frequencies. DPOAE noise level increased only slightly with age over the first year with the highest noise levels in the 12-month-old age range. Minor, nonsystematic effects for NICU history, race, and gestational age at birth were found, thus these results were generalizable to commonly seen clinical populations. CONCLUSIONS: DPOAE levels were related to wideband middle ear absorbance changes in this large sample of infants confirmed to have normal hearing at auditory brainstem response and visual reinforcement audiometry testing. This normative database can be used to evaluate clinical results from birth to 1 year of age. The distributions of DPOAE level and signal to noise ratio data reported herein across frequency and age in normal-hearing infants who were healthy or had NICU histories may be helpful to detect the presence of hearing loss in infants.
OBJECTIVES: The purpose of this study was to describe normal characteristics of distortion product otoacoustic emission (DPOAE) signal and noise level in a group of newborns and infants with normal hearing followed longitudinally from birth to 15 months of age. DESIGN: This is a prospective, longitudinal study of 231 infants who passed newborn hearing screening and were verified to have normal hearing. Infants were enrolled from a well-baby nursery and two neonatal intensive care units (NICUs) in Cincinnati, OH. Normal hearing was confirmed with threshold auditory brainstem response and visual reinforcement audiometry. DPOAEs were measured in up to four study visits over the first year after birth. Stimulus frequencies f1 and f2 were used with f2/f1 = 1.22, and the DPOAE was recorded at frequency 2f1-f2. A longitudinal repeated-measure linear mixed model design was used to study changes in DPOAE level and noise level as related to age, middle ear transfer, race, and NICU history. RESULTS: Significant changes in the DPOAE and noise levels occurred from birth to 12 months of age. DPOAE levels were the highest at 1 month of age. The largest decrease in DPOAE level occurred between 1 and 5 months of age in the mid to high frequencies (2 to 8 kHz) with minimal changes occurring between 6, 9, and 12 months of age. The decrease in DPOAE level was significantly related to a decrease in wideband absorbance at the same f2 frequencies. DPOAE noise level increased only slightly with age over the first year with the highest noise levels in the 12-month-old age range. Minor, nonsystematic effects for NICU history, race, and gestational age at birth were found, thus these results were generalizable to commonly seen clinical populations. CONCLUSIONS:DPOAE levels were related to wideband middle ear absorbance changes in this large sample of infants confirmed to have normal hearing at auditory brainstem response and visual reinforcement audiometry testing. This normative database can be used to evaluate clinical results from birth to 1 year of age. The distributions of DPOAE level and signal to noise ratio data reported herein across frequency and age in normal-hearing infants who were healthy or had NICU histories may be helpful to detect the presence of hearing loss in infants.
Authors: J E Widen; R C Folsom; B Cone-Wesson; L Carty; J J Dunnell; K Koebsell; A Levi; L Mancl; B Ohlrich; S Trouba; M P Gorga; Y S Sininger; B R Vohr; S J Norton Journal: Ear Hear Date: 2000-10 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: 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