Effects of occupational exposure to organophosphate pesticides on nerve and neuromuscular function.
This study aimed to investigate whether occupational exposure to organophosphate (OP) pesticides caused neurophysiological abnormalities. Thirty farmers who regularly spray OP pesticides and 30 fishermen (controls), living close by but not involved in pesticide spraying, were evaluated during and between cultivation seasons. The farmers had higher erythrocyte acetylcholinesterase levels than the controls during (P = 0.06) and between cultivation seasons (P = 0.09). During the cultivation season, there was a significant reduction in erythrocyte acetylcholinesterase activity in both groups (P < 0.01). Significant differences between the farmers and controls were found in sensory conduction velocity (P = 0.04) and motor conduction velocity (P = 0.04) between cultivation seasons. Sensory conduction velocity was reduced significantly in farmers (P < 0.01) and in controls (P = 0.04) during the cultivation season. Effects of OP poisoning were seen both in farmers and in controls, who had no history of spray activities. Evidence of sensory dysfunction after acute exposure and sensory and motor impairment after long-term low-level exposure to OP was seen.
Peiris-John
Roshini Janet
RJ
Department of Physiology, Faculty of Medical Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda, Sri Lanka. roshi@visual.lk
Ruberu
Dawala Kusuma
DK
Wickremasinghe
Ananda Rajitha
AR
Smit
Lidwien Ann Marie
LA
van der Hoek
Wim
W
D000328:Adult; D000382:Agricultural Workers' Diseases / Q000097:blood / Q000139:chemically induced; D002802:Cholinesterases / Q000097:blood; D006801:Humans; D007306:Insecticides / Q000009:adverse effects*; D008297:Male; D009046:Motor Neurons / Q000187:drug effects* / Q000502:physiology; D009431:Neural Conduction / Q000187:drug effects; D009475:Neurons, Afferent / Q000187:drug effects* / Q000502:physiology; D016273:Occupational Exposure / Q000009:adverse effects*; D009943:Organophosphorus Compounds; D013188:Sri Lanka
D007306:Insecticides; D009943:Organophosphorus Compounds; D002802:Cholinesterases