Document Detail

Maturation of auditory function related to hearing threshold estimations using the auditory brainstem response during infancy.
MedLine Citation:
PMID:  21129787     Owner:  NLM     Status:  In-Process    
OBJECTIVE: The objective of this study was to quantify the maturation of the Auditory Brainstem Response (ABR) at discrete periods during infancy and to provide a means to appropriately estimate hearing thresholds when the ABR is immature.
METHODS: A longitudinal study was designed to measure the in situ ABR thresholds of infants using air-conduction tone bursts of 500, 2000 and 4000Hz. Thresholds were measured using an eardrum-level microphone to eliminate the bias related to coupler-referenced scales such as the dB nHL scale used for adult assessments.
RESULTS: The study found that the in situ thresholds of a sample of normally developing infants decreased significantly during the first 6 months of life. A comparison of these in situ thresholds with those of normal-hearing adults revealed that the ABR response reached maturity in these infants between 4 and 6 months of age for the frequencies 500 and 2000Hz but remained immature, or elevated, at 6 months of age for 4000Hz.
CONCLUSIONS: The maturation of the ABR should be considered during the estimation of an infant's audiogram and subsequent diagnosis.
Andre M Marcoux
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-12-03
Journal Detail:
Title:  International journal of pediatric otorhinolaryngology     Volume:  75     ISSN:  1872-8464     ISO Abbreviation:  Int. J. Pediatr. Otorhinolaryngol.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-01-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003603     Medline TA:  Int J Pediatr Otorhinolaryngol     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  163-70     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Ireland Ltd. All rights reserved.
Department of Audiology and Speech Language Pathology, University of Ottawa, 451 Smyth Rd., Ottawa, Ontario, K1H 8M5, Canada.
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