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Neurologic function among termiticide applicators exposed to chlorpyrifos.

Authors
Steenland-K; Dick-RB; Howell-RJ; Chrislip-DW; Hines-CJ; Reid-TM; Lehman-E; Laber-P; Krieg-EF Jr.; Knott-C
Source
Environ Health Perspect 2000 Apr; 108(4):293-300
NIOSHTIC No.
20024920
Abstract
Chlorpyrifos is a moderately toxic organophosphate pesticide. Houses and lawns in the United States receive a total of approximately 20 million annual chlorpyrifos treatments, and 82% of U.S. adults have detectable levels of a chlorpyrifos metabolite (3,5,6-trichloro-2-pyridinol; TCP) in the urine. The U.S. Environmental Protection Agency has estimated that there are 5,000 yearly reported cases of accidental chlorpyrifos poisoning, and approximately one-fourth of these cases exhibit symptoms. Organophosphates affect the nervous system, but there are few epidemiologic data on chlorpyrifos neurotoxicity. We studied neurologic function in 191 current and former termiticide applicators who had an average of 2.4 years applying chlorpyrifos and 2.5 years applying other pesticides, and we compared them to 189 nonexposed controls. The average urinary TCP level for 65 recently exposed applicators was 629.5 microg/L, as compared to 4.5 microg/L for the general U.S. population. The exposed group did not differ significantly from the nonexposed group for any test in the clinical examination. Few significant differences were found in nerve conduction velocity, arm/hand tremor, vibrotactile sensitivity, vision, smell, visual/motor skills, or neurobehavioral skills. The exposed group did not perform as well as the nonexposed group in pegboard turning tests and some postural sway tests. The exposed subjects also reported significantly more symptoms, including memory problems, emotional states, fatigue, and loss of muscle strength; our more quantitative tests may not have been adequate to detect these symptoms. Eight men who reported past chlorpyrifos poisoning had a pattern of low performance on a number of tests, which is consistent with prior reports of chronic effects of organophosphate poisoning. Overall, the lack of exposure effects on the clinical examination was reassuring. The findings for self-reported symptoms raise some concern, as does the finding of low performance for those reporting prior poisoning. Although this was a relatively large study based on a well-defined target population, the workers we studied may not be representative of all exposed workers, and caution should be exercised in generalizing our results.
Keywords
Neurological-reactions; Neurological-system; Neurotoxic-effects; Neurotoxicity; Pesticides; Pesticide-industry
Contact
K. Steenland, National Institute for Occupational Safety and Health, Cincinnati (NIOSH), R13, 4676 Columbia Parkway, Cincinnati, OH 45226 USA
CODEN
EVHPAZ
CAS No.
2921-88-2
Publication Date
20000401
Document Type
Journal Article
Email Address
kns1@cdc.gov
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
0091-6765
NIOSH Division
DSHEFS
Source Name
Environmental Health Perspectives
State
OH; NC
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