Document Detail

VDTs: field levels, epidemiology, and laboratory studies.
MedLine Citation:
PMID:  2061049     Owner:  NLM     Status:  MEDLINE    
As the use of video display terminals (VDTs) has expanded, questions have been raised as to whether working at a VDT affects the risk of adverse pregnancy outcome. A particular focus for these questions has been the very low frequency (VLF) magnetic field produced by a VDT's horizontal deflection coil. VDTs also produce VLF electric fields, extremely low frequency (ELF) electric and magnetic fields, and static electric fields, Ten studies of pregnancy outcome in VDT operators have been conducted in six countries, and with one exception, none has concluded that magnetic fields from VDTs may predispose pregnant operators to spontaneous abortion or congenital malformation. The epidemiologic studies conducted thus far do not provide a basis for concluding that VDT work and adverse pregnancy outcome are associated. Studies of fetal resorptions and malformations in rodents exposed to VLF magnetic fields have produced inconsistent findings. Two laboratories in Sweden that studied mice have reported positive results, one laboratory showing field-related malformations (but not resorptions) and the other showing field-related resorptions (but not malformations). Two Canadian laboratories have reported negative results in rats and mice. Studies of avian embryos have also yielded inconsistent results, but lacking a maternal-fetal placental interface, avian embryos are a questionable model for evaluating human reproductive risks. Finally, VLF electric and magnetic fields measured at the operator position are in compliance with field strength standards and guidelines that have been established around the world.
R Kavet; R A Tell
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Health physics     Volume:  61     ISSN:  0017-9078     ISO Abbreviation:  Health Phys     Publication Date:  1991 Jul 
Date Detail:
Created Date:  1991-08-08     Completed Date:  1991-08-08     Revised Date:  2005-11-16    
Medline Journal Info:
Nlm Unique ID:  2985093R     Medline TA:  Health Phys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  47-57     Citation Subset:  IM    
Richard Tell Associates, Inc., Las Vegas, NV 89131.
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MeSH Terms
Computer Terminals*
Electromagnetic Fields*
Occupational Exposure* / standards
Pregnancy / radiation effects*
Pregnancy Outcome / epidemiology*

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

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