Changing Patterns of Causative Pathogens over Time and Efficacy of Empirical Antibiotic Therapies in Acute Cholangitis with Bacteremia.

Background/Aims: To select appropriate empirical antibiotics, updates on the changes in pathogens are essential. We aimed to investigate the changes in pathogens and their antibiotic susceptibility in acute cholangitis (AC) with bacteremia over a period of 15 years. Furthermore, the efficacy of empirical antibiotic therapies and the risk factors predicting antibiotic-resistant pathogens (ARPs) were analyzed. Methods: A total of 568 patients with AC and bacteremia who were admitted to Daegu Catholic University Medical Center from January 2006 to December 2020 were included. Their medical records were retrospectively reviewed. In addition, the data were grouped and analyzed at 3-year intervals under the criteria of Tokyo Guideline 2018. Results: During the study period, 596 pathogens were isolated from blood cultures of 568 patients. The three most common pathogens were Escherichia coli (50.5%), Klebsiella species (24.5%), and Enterococcus species (8.1%). The proportion of vancomycin-resistant Enterococci (VRE) has increased since the mid-2010 (0.0% to 4.3%, p=0.007). There was emergence of carbapenem-resistant Enterobacteriaceae (CRE) in 2018 to 2020, albeit not statistically significant (1.3%, p=0.096). Risk factors predicting ARP were healthcare-associated infection, history of previous biliary intervention, and the severity of AC. For patients with these aforementioned risk factors, imipenem was the most effective antibiotic and piperacillin-tazobactam was also effective but to a lesser degree (susceptibility rates of 92.1% and 75.0%, respectively). Conclusions: The proportion of VRE has increased and CRE has emerged in AC. In addition, healthcare-associated infection, history of previous biliary intervention, and the severity of AC were independent risk factors predicting ARP. For patients with these risk factors, the administration of imipenem or piperacillin-tazobactam should be considered.

Effect of biliary stenting combined with ursodeoxycholic acid and terpene treatment on retained common bile duct stones in elderly patients: a multicenter study.

OBJECTIVES: For frail, elderly patients with large impacted common bile duct (CBD) stones, long-term treatment with biliary stenting provides palliation. Biliary stenting with choleretic agents such as ursodeoxycholic acid (UDCA) and terpene preparations may promote CBD stone size reduction. We studied the effectiveness of biliary stenting combined with UDCA and a terpene preparation as a medical treatment for difficult-to-remove CBD stones in patients older than 65 years in this multicenter, prospective study. METHODS: A total of 28 elderly patients with CBD stones refractory to conventional endoscopic removal, including mechanical lithotripsy, underwent endoscopic placement of a straight 10-F plastic biliary stent. Each patient was administered 600 mg of UDCA and 300 mg of a terpene preparation daily for a mean of 6 months. After 6 months of medication following the initial endoscopic retrograde cholangiopancreatography (ERCP), a second ERCP was performed and endoscopic stone removal was again attempted. Differences in stone size and CBD diameter before and after biliary stenting and medication were compared. The complete stone removal rate after treatment was obtained. RESULTS: The mean size (transverse x longitudinal diameter) of the CBD stones was initially 21.6 x 29.5 mm, and it decreased significantly to 12.2 x 20.1 mm at the second ERCP (P<0.01). The mean CBD diameter measured initially at the cystic duct insertion level was 23.2 mm, and it decreased significantly to 19.5 mm at the second ERCP (P<0.01). After biliary stenting with medication, endoscopic stone removal was successful in 26 of 28 patients (92.8%), with a mean of 1.7 subsequent ERCP sessions. CONCLUSIONS: Endoscopic biliary stenting with a period of combined UDCA and terpene preparation administration seems to be a safe and effective method for retained CBD stones in elderly patients. A prospective study with randomization and a control group is required to confirm these results.