Pancreatic Elastography Predicts Endoscopic Secretin-Pancreatic Function Test Result in Patients With Early Changes of Chronic Pancreatitis: A Prospective, Cross-Sectional, Observational Study

INTRODUCTION: The endoscopic pancreatic function test (ePFT) has been proposed for the evaluation of patients with suspected early chronic pancreatitis (CP) in the appropriate clinical context, but the cost and duration of the test limit its clinical applicability. Pancreatic secretion decreases as pancreatic fibrosis develops in CP. Pancreatic fibrosis can be quantified by endoscopic ultrasound-elastography (EUS-E). We aim at evaluating whether EUS-E correlates with and could replace ePFT for the evaluation of patients with suspected CP. METHODS: A prospective, cross-sectional, and observational study of patients with clinical suspicion of CP and inconclusive EUS findings was conducted. EUS-E and ePFT were performed. Diagnosis of CP was supported if the ePFT result (bicarbonate peak) was abnormally low (<80 mEq/L). Correlation between EUS-E (strain ratio [SR]) and ePFT results was analyzed by linear regression. Diagnostic accuracy of EUS-E for CP was calculated using ePFT as a reference method. RESULTS: Sixty-one patients were included and analyzed. The mean peak bicarbonate concentration at the ePFT was 63.8 +/- 23.6 mEq/L, and it was abnormally low in 50 patients (82.0%). The mean SR was 3.85 +/- 1.24. Correlation between SR and bicarbonate secretion was highly significant (r = 0.715, P < 0.0001). Diagnostic accuracy of EUS-E for CP was 93.4%. DISCUSSION: The degree of pancreatic fibrosis as evaluated by EUS-E correlates significantly with the secretin-stimulated pancreatic secretion of bicarbonate in patients with clinical suspicion of CP and inconclusive EUS findings of the disease. EUS-E could replace ePFT for the evaluation of these patients in clinical practice.