Objective: Level of plasma cholinesterase and its association with clinical manifestations.

Methods: This is a prospective study and observation study of 50 cases of organo phosphorus poisoning compound admitted in casualty and intensive care department. In present study we were evaluated plasma cholinesterase levels and correlate with clinical symptomatology in organo phosphorus poisoning, also included patient requiring ventilator support in respiratory failure patients. Prior approval for the study and the protocol was obtained from the institution ethical committee. In present study, serum cholinesterase estimation was repeated on after 6 hours, 12 hours, 24 hours, 48 hours, 96 hours and 7th day of stay in intensive care unit. The serum cholinesterase activity was measured by Genx cholinesterase butyryl thiocholinemethod (quantitative determination of cholinesterase in human serum).

Conclusion: In present study 50 cases of organophosphorus compound poisoning admitted to our tertiary care centre. Commonest age group 21 to 30 years and 31 to 40 years. Serum cholinesterase is a useful marker for predicting clinical outcome in op poisoning as marked reductions are associated with increased need for ventilator support, atropine requirement, duration of hospital stay and outcome. Serum cholinesterase levels correlated well with clinical manifestation, severity of poisoning, ventilator support required or not and outcome.