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Background The main objective of this study to evaluate the association between CPK-MB, CPK, LDH levels and ECG changes to find out the prognosis in patients of organophosphorous poisoning. Methods This was a prospective observational hospital-based study conducted among 94 adult patients who were admitted with history of organophosphorous compound poisoning to the Department of Toxicology in Rajiv Gandhi Government General Hospital, Chennai, after obtaining clearance from Institutional Ethics Committee and written informed consent from the study participants. Results The comparison of initial ECG abnormalities and mean CPK, mean CK-MB, mean LDH values showed a positive correlation with statistical significance. The CPK values & CK-MB values at the time of initial evaluation were found to be significantly higher among the deceased patients in comparison to those discharged. Also, a study on the initial LDH value of deceased patients revealed significantly higher levels as compared to those that of the discharged patients. Conclusion Mortality was observed only in patients whose on admission ECG had QTc prolongation, conduction block, QRS changes, VT and VF. It was observed that the CPK, CK-MB, LDH levels recorded were frequently higher among the OPC poisoning patients. The CPK, CPKMB and LDH values recorded at the time of admission exhibited significantly higher values in the case of the deceased than that of the discharged. On admission, CPK, CK-MB, LDH levels were significantly higher in patients with abnormal ECG as compared to normal ECG. Within each ECG parameter, significant difference was observed in CPK, CK-MB, LDH levels among survived and expired patients. [ABSTRACT FROM AUTHOR]