Abstract
AIM: To investigate the possible action and mechanism of duodenal-biliary reflux in the pathogenesis of bile duct pigment gallstone.
METHODS: Forty-eight patients were divided into three groups: polyp of gallbladder (PG, n = 10), cholecystolithiasis (CH, n = 27) and calculus of bile duct (CBD, n = 11). Bile samples were collected during operation for bacterial culture and endotoxin examination. Forty-one patients received T tube drainage after cholecystectomy and choledochotomy were divided into reflux (n = 16) and non-reflux group (n = 25) according to radionuclide examination. The activity of biliary amylase, lipase and β-glucuronidase were detected in 26 of the 41 patients.
RESULTS: The positive rate of bacterial culture was 0% in PG group, 0% in CH group and 81.8% in CBD group, and the level of endotoxin in bile was (0.003 ± 0.004) × 10-6, (0.01 ± 0.02) × 10-6, and (10.12 ± 4.49) × 10-6 EU/L the above corresponding group, respectively. Compared with those in the former two groups, the positive rate and endotoxin level were higher in the latter CBD group (P < 0.01). Sixteen patients showed duodenal-biliary reflux (39.02%) among 41 patients. The activities of biliary amylase, lipase and exogenous β-glucuronidase in reflux group was significantly higher than those in non-reflux group (amylase: 79 891 ± 91 152 nkat/L vs 582 ± 928 nkat/L, P < 0.01; lipase: 86 110 ± 58 255 nkat/L vs 6 124 ± 7 500 nkat/L, P < 0.01; β-glucuronidase: 27 789 ± 13 849 nkat/L vs 15 369 ± 7 533 nkat/L, P < 0.01).
CONCLUSION: Duodenal-biliary reflux can promote the formation of pigment gallstone through bacteria, endotoxin, amylase, lipase and exogenous β-glucuronidase.
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