Abstract:Objective To investigate the timeliness and safety of the one-piece retrievable bile duct plastic stent in the treatment of malignant biliary obstruction.Methods 81 patients with malignant biliary obstruction who underwent ERCP from January 2019 to May 2022 were retrospectively selected. Among them, 25 patients were implanted with one-piece retrievable bile duct plastic stent (one-piece stent group), 23 patients were implanted with ordinary plastic stents (ordinary stent group), and 33 patients were implanted with metal-covered stent (metal stent group). The changes of liver function, stent patency time, incidence of reflux, incidence of postoperative pancreatitis, single hospitalization days and hospitalization costs were compared among the three groups.Results There was no significant difference in liver function among the three groups before stent implantation (P > 0.05). Compared with the ordinary stent group, the TBIL and DBIL indexes of the one-piece stent group and metal stent group had a more obvious decreasing trend, and the DBIL indexes of the one-piece stent group had a more obvious decreasing degree than that of the metal stent group (P < 0.05). The stent patency time in the metal stent group was the longest (184.70 ± 16.40) d, followed by the one-piece stent group (118.64 ± 16.00) d, and the ordinary stent group was the shortest (96.43 ± 15.85) d,the difference was statistically significant (P < 0.05). The incidence of reflux in the one-piece stent group was the lowest, followed by the metal stent group, and the incidence of reflux in the ordinary stent group was the highest, and the difference was statistically significant among the three groups (P < 0.05). There was no significant difference in the incidence of pancreatitis and the length of single hospital stay among the three groups (P > 0.05). The hospitalization cost of the metal stent group was higher than that of the one-piece stent group and the ordinary stent group, and the difference was statistically significant (P < 0.05).Conclusion Compared with the metal-covered stent and the ordinary plastic stent, the one-piece retrievable bile duct plastic stent has better liver function recovery after the stent implantation, the stent patency time is relatively long, the incidence of reflux is low, and the hospitalization cost is low. It is safe and effective, and is the best choice for patients with malignant biliary obstruction.