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A R Velasco

Publications and source records attributed to A R Velasco.

8 recordsLinked to original sources
PubMed1987

Clinical confirmation of organophosphate poisoning by serial cholinesterase analyses.

Three groups of agricultural workers with a history of exposure to organophosphate pesticides were followed up to evaluate the utility of sequential postexposure cholinesterase analyses to confirm organophosphate intoxication in the absence of baseline cholinesterase values. Three or more cholinergic symptoms were reported by 50 of the 72 patients. Initial plasma and red blood cell cholinesterase values of 45 of the workers were above the lower limit of the laboratory normal range. Follow-up examinations, including cholinesterase analyses, were conducted on 57 patients. When final postexposure cholinesterase determinations were taken as estimates of individual normal baseline values, the plasma and red blood cell activity of the three groups was shown to have been inhibited. The data support the use of sequential postexposure plasma cholinesterase analyses to confirm the diagnosis of organophosphate-induced illness in the absence of baseline values.

Adolescent↗
PubMed1986

Clinical confirmation of organophosphate poisoning of agricultural workers.

A group of 31 lettuce harvesters exposed to the organophosphate pesticide mevinphos presented to a local emergency room with moderate cholinergic symptoms and eye and skin irritation, with 22 of the subjects (76%) reporting three or more symptoms. None had baseline cholinesterase values, and plasma cholinesterase activity for all but two workers was above the lower limit of the laboratory normal range. None of the workers received antidotes and all were released for return to work. Twenty-nine workers sought additional care when symptoms persisted, and were followed by the investigators until 12 weeks after exposure. Plasma and red blood cell (RBC) cholinesterase increased until 14 days after exposure. Plasma cholinesterase was estimated to have been inhibited by an average of 15.6% (p less than 0.01), and RBC cholinesterase by 5.6% (p less than 0.01). These findings support the utility of sequential postexposure plasma cholinesterase analyses in confirmation of suspect organophosphate-induced illness when baseline values are not available.

Adult↗
PubMed1985

Clinical management of field worker organophosphate poisoning.

A group of 16 cauliflower workers poisoned by residues of the organophosphate insecticides mevinphos and phosphamidon was followed in weekly clinics with interviews and determinations of plasma and erythrocyte cholinesterase levels. None had preexposure baseline values. Although six had initial erythrocyte cholinesterase values within the laboratory normal range, subsequent testing showed their erythrocyte activity had been significantly inhibited. While the most severe symptoms of the 16 subjects resolved after 28 days, their erythrocyte cholinesterase levels did not reach a plateau until an average of 66 days after exposure, after which most patients continued to report blurred vision, headache, weakness or anorexia. These findings support the view that the diagnostic utility of single cholinesterase levels is limited in the absence of baseline values.

Adolescent↗