Abstract:Objective To evaluate the clinical efficacy and safety of spraying different doses of mannitol locally on the duodenal papilla in preventing pancreatitis after endoscopic retrograde cholangiopancreatography (ERCP).Methods A retrospective analysis was conducted on the clinical data of 138 patients who successfully completed ERCP from January 2020 to October 2024. According to the different doses of mannitol sprayed before the end of the operation, the patients were divided into 4 groups: group D1 (33 cases) was sprayed with 20 mL of 20% mannitol solution, group D2 (37 cases) was sprayed with 60 mL of 20% mannitol solution, group D3 (33 cases) was sprayed with 100 mL of 20% mannitol solution, and group C (35 cases) was not sprayed with any liquid. The changes in the levels of white blood cells (WBC), C-reactive protein (CRP), and amylase (AMS) of the four groups of patients at 12 hours before surgery, 12 hours after surgery, 24 hours after surgery, and 48 hours after surgery were compared. To evaluate the incidence of postoperative hyperamylasemia (PEHA) and postoperative pancreatitis (PEP), as well as the occurrence of adverse reactions in the four groups of patients.Results At 12 hours before the operation, there were no statistically significant differences in the levels of WBC, CRP and AMS among the four groups (P > 0.05). At 12, 24 and 48 hours after the operation, the levels of WBC, CRP and AMS at the same time points in group D2 and group D3 were significantly lower than those in group C and group D1, and the differences were statistically significant (P < 0.05). There were no statistically significant difference in the levels of WBC, CRP and AMS at the same time points between group D2 and group D3, and between group C and group D1 (P > 0.05). After the operation, the incidence rates of PEHA in group D2 and group D3 were 21.6% (8/37) and 18.2% (6/33) respectively, which were significantly lower than 48.6% (17/35) in group C and 45.5% (15/33) in group D1. The differences were statistically significant (P < 0.05). The incidence rates of PEP in group D2 and group D3 were 2.7% (1/37) and 3.0% (1/33) respectively, which were lower than 11.4% (4/35) in group C and 9.1% (3/33) in group D1. However, there was no statistically significant difference among the four groups (P > 0.05). After the operation, the total incidence of adverse reactions in group D3 was 45.5% (15/33), which was significantly higher than that in the other three groups, and the difference was statistically significant (P < 0.05). The total incidence of adverse reactions in group D2 was 8.1% (3/37), but compared with group C and group D1, the difference was not statistically significant (P > 0.05).Conclusion Local spraying of 60 mL and 100 mL of mannitol on the duodenal papilla before the end of ERCP can significantly reduce the levels of WBC, CRP, and AMS in patients after surgery, as well as the incidence of PEHA, and has a certain preventive effect on PEP. The 60 mL dose is a better choice with fewer adverse reactions and is safe.