Correlation of Serum Amylase, Lipase and Creatine Kinase with Severity of Organophosphate Poisoning- A Cohort Study

Introduction: Organophosphate Compounds (OP) are widely used pesticides in agriculture. It is easily available and OP poisoning is most common cause of poisoning and hospital admissions. Severe poisoning is associated with high mortality. Severity of poisoning can be assessed by Peradeniya Organophosphorus Poisoning (POP) scale, Acute Physiology and chronic Health Evaluation (APACHE) II, Glasgow Coma Scale (GCS) or serum Cholinesterase Level (ChE). Serum amylase, lipase, and creatine kinase are important biomarkers raised in OP poisoning. Aim: To correlate serum amylase, lipase, and creatine kinase with severity of OP poisoning. Materials and Methods: This was a hospital based observational cohort study conducted on 130 patients of organophosphate poisoning admitted in General Medicine wards of SCB Medical College, Cuttack, Odisha from June 2019 to December 2020. Serum Acetylcholine Esterase (AChE), amylase, lipase and creatinine kinase were estimated at admission, day 2, and at discharge. Other routine investigations were done. Acetylcholine Esterase (AChE) was used to confirm the diagnosis. The severity of poisoning was assessed using POP scale and graded as mild, moderate and severe. The severity of poisoning and the level of enzymes were correlated. The parameters were tabulated and mean values and Standard Deviation (SD) were analysed using Statistical Package For The Social Sciences (SPSS) software version 22.0. Results: Out of 130 patients 91 were males and 39 were females, mostly from rural areas, both farming and non-farming community. Age ranged from 14 years to 79 years, with majority in 19 to 39 years. AChE decreased in all cases depending on severity confirming OP poisoning. Severity as assessed by POP score were mild (52 patients), moderate (46 patients) and severe (32 patients). At admission, the Amylase (U/L), Lipase (U/L), and Creatine kinase (U/L) level (mean±SD) in mild poisoning were 83.7±41.9 U, 70.9±18.6, 72.5±34.9, in moderate poisoning 153.6±109.7, 91.9±47.4, 92.6±81.5, and in severe poisoning 243.9±113.8, 195.3±147.7, 298.8±207.4, respectively. Measurements on second day also remained elevated. Among the severe cases 24 patients developed Intermediate Syndrome (IMS), and 26 patients died. There was positive correlation between increase of enzyme levels and the severity of OP poisoning as per POP score. Conclusion: Serum amylase, lipase, and creatine kinase level correlated well with the severity of organophosphorus poisoning and scan be used additionally as an indicator to assess the severity. Serum amylase is a better indicator of severity than lipase and Creatine Kinase (CPK).