Document Detail

Assessment of auditory brainstem function in lead-exposed children using stapedius muscle reflexes.
MedLine Citation:
PMID:  21546039     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to investigate the neurological integrity and physiological status of the auditory brainstem tracts and nuclei in children with chronic lead (Pb) exposure using non-invasive acoustic stapedius reflex (ASR) measurements of afferent and efferent-neuromuscular auditory function. Following audiological examinations, uncrossed (ipsilateral) and crossed (contralateral) brainstem ASR responses were evoked by pure tone (500, 1000, and 2000 Hz), and broadband noise (bandwidth: 125-4000 Hz) stimulus activators. The ASR threshold (ASRT), amplitude growth, and decay/fatigue were measured by conventional clinical middle ear immittance methods in a group of Andean children (age range: 2-18 years) with a history of chronic environmental Pb exposure from occupational Pb glazing. Blood lead (PbB) levels of the study group (n=117) ranged from 4.0 to 83.7 μg/dL with a mean PbB level of 33.5 μg/dL (SD: 23.6; median: 33.0: CDC III Classification). The PbB distribution data indicated that 77.8% (n=91) of the children had PbB levels greater than the CDC action line of 10 μg/dL. Repeatable, normal ASRTs were elicited for ipsilateral (mean: ≤90 dB HL) and contralateral (mean: ≤97 dB HL) stimulation for each acoustic activator. Spearman Rho correlation analysis indicated no significant association between PbB level and ipsilateral or contralateral ASRT for any of the stimulus activators. The ASR amplitude growth results showed typical growth functions with no Pb-associated aberrations. No statistical association was found between ASR decay/adaptation (ASRD) and PbB level for any of the stimulus activators. The results of stapedius muscle reflex testing using several stimulus activators showed no significant relationship between PbB level and the physiological integrity of the auditory brainstem mediated ASR responses in children with chronic Pb exposure and elevated PbB levels.
S A Counter; Leo H Buchanan; Fernando Ortega; Jeannette van der Velde; Erik Borg
Related Documents :
21185089 - The assessment of hearing impairment among healthy children in rural and urban areas in...
16369699 - Frontal electroencephalogram activation asymmetry, emotional intelligence, and external...
21119899 - Increasing response diversity in children with autism.
21416199 - Diagnostic differentiation of autism spectrum disorders and pragmatic language impairment.
15590489 - Childhood-onset multiple sclerosis and mood disorders: a case study.
21415689 - Use of the pediatric outcomes data collection instrument to evaluate functional outcome...
7152839 - Oralism and the deaf child's brain: a reply to dr. conrad.
357319 - Plasma levels of folates, ascorbate, vitamin b6 and riboflavin in children.
9766739 - Hand function in children with cerebral palsy after upper-limb tendon transfer and musc...
Publication Detail:
Type:  Journal Article     Date:  2011-05-05
Journal Detail:
Title:  Journal of the neurological sciences     Volume:  306     ISSN:  1878-5883     ISO Abbreviation:  J. Neurol. Sci.     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-06-13     Completed Date:  2011-10-13     Revised Date:  2013-06-30    
Medline Journal Info:
Nlm Unique ID:  0375403     Medline TA:  J Neurol Sci     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  29-37     Citation Subset:  IM    
Copyright Information:
Copyright © 2011. Published by Elsevier B.V.
Department of Neurology, Harvard Medical School/The Biological Laboratories, Cambridge, MA 02138, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Acoustic Stimulation / methods
Child, Preschool
Environmental Exposure
Evoked Potentials, Auditory, Brain Stem / drug effects,  physiology*
Functional Laterality
Lead / blood,  toxicity
Lead Poisoning / pathology*,  physiopathology*
Reflex, Acoustic / drug effects*,  physiology
Stapedius / drug effects,  physiopathology*
Grant Support
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Effects of semantic elaboration and typicality on picture naming in Alzheimer disease.
Next Document:  Diminished emotional sweating in patients with limbic encephalitis.