Abstract

MUNOZ Q, María T; IGLESIAS A, Verónica P  and  LUCERO M, Boris A. Exposure to organophosphate and cognitive performance in chilean rural school children: an exploratory study. Rev. Fac. Nac. Salud Pública [online]. 2011, vol.29, n.3, pp.256-263. ISSN 0120-386X.

OBJECTIVE: to evaluate the presence of organophosphate metabolites (OP) in the urine of rural schoolchildren and estimate its association with their cognitive performance. METHODOLOGY: a cross-sectional exploratory study in which a total of 25 children were assessed. Cognitive functioning was measured using the WISC-III intelligence test. Additionally, the concentration of OP metabolites in their urine was tested. RESULTS: 56% of the children had concentration levels above the detection limit for dimethylphosphate (DMP) and dimethyltiophosphate (DMTP). Moreover, 92% of them had the metabolite diethylphosphate (DEP) values on this limit. Regarding the WISC-III, the intelligence quotient (IQ) values below the average (IQ > 90) correspond to: Total IQ = 60% performance IQ = 64%, verbal IQ = 52%, perceptual organization IQ = 60%, processing speed IQ = 95%, and freedom from distractibility IQ = 64%. An inverse association was found between the processing speed factor and DMTP (r_s = -0.44, p = 0.014). CONCLUSIONS: results indicate that the rural schoolchildren whose urine was measured with OP metabolite biomarkers had been exposed to OP pesticides. A relationship was observed between the presence of OP metabolites and the cognitive performance factor of the WISC-III test. We believe it is appropriate to evaluate the effects of the presence of OP metabolites on cognitive functioning in a larger sample, while considering other exposure variables.

Keywords : Organophosphate pesticides; cognitive performance; rural schoolchildren.

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