Combination of Two-hour Post-ERCP Serum Amylase Level with Clinical Risk Factors for Predict Pancreatitis After Procedure
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Abstract
Background: Pancreatitis is the most common and life threatening complication of endoscopic retrograde cholangiopancreatography. Clinical factors are not reliable for diagnosis. Serum amylase is useful for early detection post-ERCP pancreatitis (PEP).
Objective: To evaluate the value of using 2 hour post-ERCP serum amylase level combine with clinical risk factors as a predictor of post-ERCP pancreatitis.
Methods: A prospective cohort study of consecutive patients who underwent ERCP from February 2017 to December 2019. Patients and procedure related risk factors as well as the 2 hour post ERCP amylase levels were analyzed.
Statistical analysis: Categorical variables were compare using Fisher’s exact test ,whereas continuous variables were compare using t-test. ROC curve analysis was used to determine the cutoff level of 2 hour serum amylase. Predictive factors were identified with multivariate logistic regression.
Results: A total 355 ERCP procedures were included in this study. Post-ERCP pancreatitis occurred in 41 patients (11.5%). Patients with PEP had 2 hour serum amylase level higher than non PEP group (421 vs 104 IU/L, P < 0.001). The cutoff value of 2 hour serum amylase was 124 IU/L (1.5 times of the upper normal limit) sensitivity 85.4% area under ROC curve 81.7%. By univariate analysis, significant risk factors were difficult cannulation (OR 3.02), pancreatic duct cannulation (OR 3.5), precut sphincterotomy (OR 3.67) and 2 hour serum amylase > 124 IU/L (OR 20.71). Multivariate analysis revealed that 2 hour serum amylase > 124 IU/L was a significant predictive factor for PEP (OR 14.78, 95%CI 5.66 – 38.59, P < 0.0001 ) . The area under ROC curve for predict PEP was significantly increase when using 2 hour serum amylase combine with clinical risk factors instead of clinical risk factors alone (AUC 84.9% VS 68.2%, P < 0.0001).
Conclusion: Combination of 2 hour post-ERCP serum amylase level combine with clinical risk factors is a reliable test to predict post ERCP pancreatitis
Keywords: Serum amylase, Post endoscopic retrograde cholangiopancreatography pancreatitis, Prediction
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References
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