Biliary stenting in the management of large or multiple common bile duct stones

Efficacy and safety of immediate vs. delayed endoscopic retrieval of large or multiple common bile duct stones in high-risk elderly patients: a prospective, randomized comparative study

INTRODUCTION

Elderly patients with common bile duct (CBD) stones often present with large or multiple stones, making endoscopic retrograde cholangiopancreatography (ERCP)-guided extraction a technically complex and potentially high-risk procedure.

AIM

This study aimed to compare the efficacy and safety of a staged approach-biliary stenting followed by delayed stone extraction-versus immediate stone removal during the initial ERCP in frail elderly patients with large or multiple CBD stones.

METHODS

This prospective study included high-risk elderly patients with large or multiple CBD stones, defined as either a single stone ≥ 15 mm in diameter or three or more stones, each ≥ 10 mm in diameter. Participants were randomly assigned to two equal groups: Group A underwent initial biliary stenting with elective stone retrieval after 8-12 weeks, while Group B underwent immediate stone extraction during the first ERCP.

RESULTS

A total of 400 patients were included, with 200 in each group. Baseline characteristics and stone extraction methodologies were comparable between the two groups. In Group A, stone size and number significantly decreased after stenting (mean size: 1.42 ± 0.28 cm before vs. 0.98 ± 0.19 cm after stenting; P < 0.001). The overall stone clearance rate was significantly higher in Group A compared to Group B (94% vs. 80%, P < 0.001). Post-ERCP hospital stay was significantly shorter in Group A (6.41 ± 1.27 days vs. 11.3 ± 1.86 days, P < 0.001). Group B had higher rates of complications, including cholangitis (1% vs. 7%, P < 0.05) and pneumonia (2% vs. 11%, P < 0.05).

CONCLUSION

In high-risk elderly patients with large or multiple CBD stones, temporary placement of biliary plastic stents followed by elective endoscopic stone removal effectively reduces stone size, simplifies the removal process, enhances stone clearance rates, and decreases ERCP-related complications.

Efficacy of modified pancreatic duct stent drainage during endoscopic retrograde cholangiopancreatography for common bile duct stones

BACKGROUND

Common bile duct stones pose a high risk of recurrence or disease progression if not promptly treated. However, there is still no optimal treatment approach.

AIM

To investigate the clinical efficacy of modified pancreatic duct stent drainage in endoscopic retrograde cholangiopancreatography (ERCP) for treating common bile duct stones.

METHODS

This retrospective study included 175 patients with common bile duct stones treated at Taizhou Fourth People's Hospital between January 1, 2021, and November 30, 2023. The patients were divided into three groups-the modified pancreatic duct stent drainage group (59 cases), the nasobiliary drainage group (58 cases), and the standard biliary drainage group (58 cases). Preoperative general clinical data, laboratory indicators, and the visual analog scale (VAS) at two time points (24 hours before and after surgery) were compared, along with postoperative complications across the three groups.

RESULTS

Serum levels of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, gamma-glutamyltransferase, total bilirubin, direct bilirubin, C-reactive protein, and amylase were significantly lower in the modified pancreatic duct stent drainage group and the standard biliary drainage group than those in the nasobiliary drainage group (P < 0.05). However, no statistically significant differences were observed in white blood cells, hemoglobin, or neutrophil levels among the three groups (P > 0.05). The standard biliary drainage group had significantly lower VAS scores [(4.36 ± 1.18) points] than those for the modified pancreatic duct stent drainage group [(4.92 ± 1.68) points] (P = 0.033), and the nasobiliary drainage group [(5.54 ± 1.24) points] (P = 0.017). There were no statistically significant differences in complication rates across the three groups (P > 0.05).

CONCLUSION

Compared to standard biliary drainage and nasobiliary drainage, the modified pancreatic duct stent used during ERCP for patients with bile duct stones significantly reduced hepatocyte injury, improved liver function parameters, alleviated inflammation and pain, enhanced patient comfort, and demonstrated superior safety.

Risk factors for biliary tract events during elective cholecystectomy waiting time after endoscopic retrograde cholangiopancreatography for choledocholithiasis

Objectives

Endoscopic lithotripsy and elective cholecystectomy, followed by endoscopic retrograde cholangiopancreatography, are the first-line treatments for patients with common bile duct (CBD) stones (CBDS) and gallstones. However, this approach entails acute cholecystitis and recurrent cholangitis risk while patients await surgery. We aimed to identify acute cholecystitis and cholangitis risk factors during the waiting time for elective cholecystectomy.

Methods

This study comprised 151 patients with CBDS combined with gallstones who underwent cholecystectomy within 90 days of the first endoscopic retrograde cholangiopancreatography at two tertiary care centers between January 2019 and October 2021.

Results

The incidence of biliary tract events (acute cholecystitis, acute cholangitis, or any complications requiring unplanned cholangiopancreatography) was 28% (43 cases). In univariate and multivariate analyses, plastic stent placement as a bridge to surgery for the first treatment of CBDS was an independent risk factor for biliary tract events during the waiting time for surgery (odds ratio 4.25, p = 0.002). A subgroup analysis among those with plastic stent placement revealed a CBD diameter of ≤ 10 mm as an independent risk factor for acute cholecystitis (odds ratio 4.32; p = 0.027); a CBD diameter ≥ 11 mm was an independent risk factor for acute cholangitis and unplanned re-endoscopic retrograde cholangiopancreatography (odds ratio 5.66; p = 0.01).

Conclusions

Plastic stent placement for CBDS before elective cholecystectomy increases the risk of acute cholecystitis or acute cholangitis during the waiting time for elective cholecystectomy.

Characteristics and metabolic potential of biliary microbiota in patients with giant common bile duct stones

BACKGROUND

Endoscopic retrograde cholangiopancreatography (ERCP) is an effective minimally invasive operation for the management of choledocholithiasis, while successful extraction is hampered by large diameter of stones. Emerging studies have revealed the close correlation between biliary microbiota and common bile duct stones (CBDS). In this study, we aimed to investigate the community characteristics and metabolic functions of biliary microbiota in patients with giant CBDS.

METHODS

Eligible patients were prospectively enrolled in this study in First Affiliated Hospital of Soochow University from February 2022 to October 2022. Bile samples were collected through ERCP. The microbiota was analyzed using 16S rRNA sequencing. Metabolic functions were predicted by PICRUSTs 2.0 calculation based on MetaCyc database. Bile acids were tested and identified using ultra performance liquid chromatography-tandem mass spectrometry.

RESULTS

A total of 26 patients were successfully included into final analysis, 8 in giant stone (GS) group and 18 in control group. Distinct biliary microbial composition was identified in patients with giant CBDS, with a significantly higher abundance of Firmicutes at phylum level. The unique composition at genus level mainly consisted of Enterococcus, Citrobacter, Lactobacillus, Pyramidobacter, Bifidobacterium and Shewanella. Pyramidobacter was exclusively found in GS group, along with the absence of Robinsoniella and Coprococcus. The contents of free bile acids were significantly higher in GS group, including cholic acid (98.39μmol/mL vs. 26.15μmol/mL, p=0.035), chenodesoxycholic acid (54.69μmol/mL vs. 5.86μmol/mL, p=0.022) and ursodeoxycholic acid (2.70μmol/mL vs. 0.17μmol/mL, p=0.047). Decreasing tendency of conjugated bile acids were also observed. Metabolic pathways concerning cholelithiasis were abundant in GS group, including geranylgeranyl diphosphate biosynthesis, gluconeogenesis, glycolysis and L-methionine biosynthesis.

CONCLUSIONS

This study demonstrated the community structure and metabolic potential of biliary microbiota in patients with giant CBDS. The unique biliary microbial composition holds valuable predictive potential for clinical conditions. These findings provide new insights into the etiology of giant CBDS from the perspective of biliary microbiota.

Large common bile duct stones in high-risk elderly patients: Immediate endoscopic stone removal or elective stone removal? A single-center retrospective study

BACKGROUND AND OBJECTIVE

For high-risk elderly patients with chronic diseases, endoscopic stone removal for large common bile duct stones is associated with a high risk of adverse events and incomplete stone removal. The aim of this study was to investigate whether the treatment strategy of short-term biliary plastic stent placement followed by elective endoscopic stone removal is more effective and safer than immediate endoscopic stone removal.

METHODS

The data of 262 high-risk elderly patients who received endoscopic retrograde cholangiopancreatography (ERCP) for large common bile duct (CBD) stones from 2017 to 2022 were retrospectively analyzed. The patients were divided into group A (immediate stone removal) and group B (stent drainage + elective stone removal). The baseline data of the 2 groups were matched 1:1 by propensity score matching. The stone clearance rate, ERCP procedure time, total hospital stay, and procedure-related adverse events were compared between the matched groups. In group B, stone size before and after stent placement, hospital stay, procedure time and adverse events of two ERCPs were compared.

RESULTS

A total of 57 pairs of patients were successfully matched between the 2 groups. The stone clearance rate in group B was higher than that in group A (89.5% vs. 75.3, P = 0.049). The total hospital stay in group B was longer than that in group A (11.86 ± 3.912 d vs. 19.14 ± 3.176 d, P<0.001). The total adverse event rate in group A was higher than that in group B (29.8% vs. 12.3%, P = 0.005). The incidence of cholangitis/cholecystitis after ERCP was significantly higher in group A than in group B (7.0% vs. 0.9% P = 0.029). There was no significant difference in the incidence of post-ERCP pancreatitis, bleeding, pneumonia, and cardio-cerebrovascular events between the 2 groups. There were no perforation cases in either group. After plastic biliary stent placement in group B, the stone size was significantly smaller than before stent placement (1.59 ± 0.544 cm vs. 1.95 ± 0.543 cm, P < 0.001), and there was no significant difference in the total adverse event incidence between the two ERCP procedures (18.8% vs. 10.9%, P = 0.214).

CONCLUSION

For high-risk elderly patients with large CBD stones, the treatment strategy involving temporary placement of plastic stent and elective endoscopic stone removal is safer and more effective than immediate stone removal.

Fully Covered Metal Stents Safely Facilitate Extraction of Difficult Bile Duct Stones

BACKGROUND

Ten to 15% of the common bile duct (CBD) stones require advanced endoscopic extraction techniques during endoscopic retrograde cholangiopancreatography. The study aimed to evaluate the efficacy and safety of fully covered self-expandable metal stents (FC-SEMS) for facilitating the extraction of difficult bile duct stones.

METHODS

Patients who received FC-SEMS for the extraction of difficult CBD stones were retrospectively reviewed. Group 1 included patients with extrahepatic stones above a distal CBD stricture, Group 2 included patients with intrahepatic stones above a hilar stricture, and Group 3 included patients with complex stone(s) and no biliary stricture. Complete stone clearance rate and complications of FC-SEMS treatment were evaluated.

RESULTS

The study group included 33 procedures on 32 patients (mean age: 55±17, 56.3% male). FC-SEMS was placed as a primary treatment in 15 (45.5%) procedures. Complete stone clearance was achieved in 84.6% of the procedures in Group 1, 100% in Group 2, and 87.5% in Group 3 ( P =0.23). Overall, complete stone clearance was achieved in 30 of the 33 procedures (90.9%). None of the patients developed pancreatitis, cholecystitis, or cholangitis. Stent migration occurred in 4 procedures (12.1%), and all were clinically insignificant.

CONCLUSION

FC-SEMS is effective and safe for facilitating treatment of difficult bile duct stones.

Laparoscopic Common Bile Duct Clearance, is It Feasible and Safe After Failed Endoscopic Retrograde Cholangiopancreatography?

Introduction: Concomitant gallstones and common bile duct (CBD) stones is a common problem, and there is still no consensus on the best approach in the management. Options include preoperative endoscopic retrograde cholangiopancreatography (ERCP), Laparoscopic cholecystectomy (LC) with CBD exploration, and LC with postoperative ERCP. Each option has its own limitations and complications. In this article, we assessed the feasibility of laparoscopic surgical clearance of the CBD after a failed ERCP, reasons for failure of endoscopic clearance in our cohort. We will discuss the management options after ERCP failure, the challenges, and the outcomes. Materials and Methods: We retrospectively reviewed all the cases of laparoscopic common bile duct exploration (LCBDE) performed in our hospital between April 2006 and January 2019. Two hundred cases were performed, 178 cases as a primary procedure while 22 were performed as a secondary procedure after failed ERCP. We have previously published data on the case series (PMID 33140155) and here explored the cases performed after failed ERCP as a secondary procedure. We analyzed demographics of patients, preoperative investigations, ERCP trials, and reasons for ERCP failure, operative approach, duration of operation, conversion rate, complications, and outcomes. Results: Twenty-two patients underwent a laparoscopic CBD clearance after failed ERCP. Sixteen of these were in the first 5 years of the study. Multiple attempts of ERCP were made in 7 patients (31.8%) and a single attempt in 15 patients. In 8 patients (32%), the duct was not accessible (failed cannulation) due to a variety of reasons. Nine patients had impacted stones larger than 1 cm, 4 patients had Mirrizi syndrome with concomitant large CBD stones, and 1 patient failed endoscopic clearance because of the large number of stones in the CBD. CBD clearance was successful in 19 patients (88%), 8 were completed by a transcystic approach and 14 by a transcholedochal approach. Postoperative length of stay was 12 (+10) days. One patient had an unplanned readmission within 30 days. One patient required reoperation for bleeding. Three patients developed recurrent stones and 1 developed a subsequent stricture. No mortalities were recorded. Conclusion: LCBDE is feasible and appears safe as a secondary procedure after failed ERCP. The new technologies and the advancement of surgical techniques will continue to improve success and reduce morbidity.

Risk factors for complications in elderly patients aged 85 years and over undergoing endoscopic biliary stone removal

BACKGROUND AND AIM

The number of elderly patients with biliary stones is increasing. Endoscopic retrograde cholangiography (ERCP) is considered to be an effective treatment for biliary stones. Having a sound knowledge of the risk factors can help reduce the incidence and severity of complications for ERCP. Furthermore, limited research has been published on patients aged over 85 years undergoing endoscopic biliary stone removal. This study aims to determine the risk factors that lead to complications of ERCP in patients over 85 years of age.

METHODS

This was a single-center retrospective study. We analyzed 156 patients aged ≥ 85 years with biliary stones who underwent their first ERCP at Chinese PLA General Hospital from February 2002 to March 2021. Logistic regression models were employed to identify the independent risk factors for complications.

RESULTS

A total of 13 patients (8.3%) had complications. Thereinto, pancreatitis, cholangitis, bleeding, and other complications occurred in 4 cases (2.6%), 1 cases (0.6%), 4 cases (2.6%), and 4 cases (2.6%), respectively. There was no perforation or death related to ERCP. Independent risk factors for complications were acute biliary pancreatitis (ABP) (P = 0.017) and Charlson Comorbidity Index (CCI) (P = 0.019). Significantly, reasons for incomplete stone removal at once were large stone (>10 mm) (P < 0.001) and higher acute physiology and chronic health evaluation scoring system (APACHE-II) (P = 0.005).

CONCLUSIONS

ERCP was recommended with caution in patients ≥ 85 years of age with ABP or higher CCI undergoing endoscopic biliary stone removal. In patients with ABP without cholangitis or biliary obstruction we recommend against urgent (within 48 h) ERCP. Patients with higher CCI who can tolerate ERCP can undergo rapid ERCP biliary stenting or nasobiliary implantation with later treatment of stones, and patients who cannot tolerate ERCP are treated promptly with PTCD and aggressive conservative treatment.

Distal Biliary Stent Migration in Patients with Irretrievable Bile Duct Stones: Long-Term Comparison Between Straight and Double-Pigtail Stents

BACKGROUND

Prolonged biliary stenting may be considered in high-risk patients with irretrievable bile duct stones (IBDS). Distal stent migration (DSM) is a known complication, although data beyond the recommended interval of temporary stenting (3-6 months) are lacking. We compared the long-term incidence of DSM between straight and double-pigtail stents in patients with IBDS.

METHODS

Consecutive patients with IBDS undergoing plastic biliary stenting (1/2009-12/2019) were retrospectively reviewed. DSM was confirmed on follow-up examination when the stent was no longer present at the papillary orifice nor fluoroscopically visible in the bile duct. Kaplan-Meier and Cox regression analyses were used to determine estimates and predictors of DSM.

RESULTS

Overall, 618 biliary stenting procedures (410 patients) were included: 289 with a straight stent (group A) and 329 with a double-pigtail (group B). By Kaplan-Meier analysis, the DSM rates were 8.4 and 14.6% at 6 months, 21.4 and 27.7% at 12 months, 27 and 43.5% at 18 months, and 37.2 and 60.4% at 24 months, for groups A and B, respectively (p = 0.004). Double-pigtail stents were at higher risk for DSM (HR = 7.38, p = 0.04), whereas an inverse correlation was noted with age (HR = 0.97, p = 0.0001). Considering only temporary stenting procedures (≤ 6 months; n = 297), the probability of DSM was not significantly different between the two groups (p = 0.07).

CONCLUSIONS

In a setting of prolonged stenting for IBDS, the probability of DSM appears to be higher when a double-pigtail stent is used and in younger patients. A relative anti-migratory advantage of double-pigtail over straight stents appears negligible in this study.

Gastrointestinal Emergencies and the Role of Endoscopy

Many gastrointestinal (GI) disorders present to the emergency room with acute clinical presentations, some even life threatening. Common emergencies encountered that require urgent endoscopic interventions include GI hemorrhage (variceal and nonvariceal), foreign body ingestion, obstructive jaundice, postprocedure-related complications such as postpolypectomy bleed or perforation, etc. A major advantage of emergency endoscopy is that it is cost effective and, on many occasions, can be life-saving. The present review will highlight a practical approach on various endoscopic modalities and their use in the GI emergencies.

Endoscopic Management of Complex Biliary Stones

Complex biliary stones may be challenging to remove with standard endoscopic techniques. Factors contributing to complexity include large stone size (≥15 mm), multiple stones, high stone:distal duct ratio, stones above strictures and those in difficult anatomic position. In these cases, additional techniques may be needed, such as endoscopic papillary large balloon dilatation, mechanical lithotripsy, cholangioscopic visually directed lithotripsy, and extracorporeal shockwave lithotripsy. The choice of technique depends on local expertise and resources. Cases should be planned to identify the appropriate technique to avoid multiple procedures. This article describes the factors linked to difficulty and the steps to overcome them.

[Complete Endoscopic Clearance of Common Bile Duct Stones]

Common bile duct stones (CBDS) are the most common cause of acute cholangitis. Removal by endoscopic retrograde cholangiopancreatography became the standard of care after endoscopic sphincterotomy was introduced. On the other hand, it is still difficult to remove 10-15% of CBDS completely in the first attempt for various reasons. This review describes the methods for the complete endoscopic clearance of CBDS, including difficult cases, reflecting the latest knowledge and techniques.

Difficult Biliary Stones: A Comprehensive Review of New and Old Lithotripsy Techniques

Biliary stones represent the most common indication for therapeutic endoscopic retrograde cholangiopancreatography. Many cases are successfully managed with biliary sphincterotomy and stone extraction with balloon or basket catheters. However, more complex conditions secondary to the specific features of stones, the biliary tract, or patient’s needs could make the stone extraction with the standard techniques difficult. Traditionally, mechanical lithotripsy with baskets has been reported as a safe and effective technique to achieve stone clearance. More recently, the increasing use of endoscopic papillary large balloon dilation and the diffusion of single-operator cholangioscopy with laser or electrohydraulic lithotripsy have brought new, safe, and effective therapeutic possibilities to the management of such challenging cases. We here summarize the available evidence about the endoscopic management of difficult common bile duct stones and discuss current indications of different lithotripsy techniques.

Is the use of fully covered metal stents effective in the treatment of difficult lithiasis of the common bile duct?

BACKGROUND

The management of difficult lithiasis of common bile duct (CBD) often requires a multimodal approach. Fully Covered Metal Stents (FCSEMS) could fragment the stones, dilate strictures of the CBD and progressively enlarge the papillary orifice. The aim of the study was to evaluate the efficacy of FCSEMS in the treatment of difficult lithiasis of CBD.

METHODS

All consecutive cases of difficult lithiasis of CBD after an attempt of clearance with complete sphincterotomy were retrospectively considered from 2009 to 2019. Intrahepatic lithiasis cases were excluded. Multivariable analysis (stepwise logistic regression if p value < 0.1 at univariable analysis) was made to understand factors associated with efficacy of FCSEMS in difficult lithiasis of CBD.

RESULTS

163 cases of difficult lithiasis over 1516 cases of lithiasis of CBD (incidence of 11%) were considered. Among eligible patients, 96 (mean age 78 ± 11.9 years, 43% males) placed a FCSEMS during the first ERCP. Mean diameter of stone was 17.5 ± 5.5 mm. An attempt of dilation during the same procedure was made in 18% cases. After removal of the stent, 52 (54%) patients had complete clearance of CBD at cholangiography. The rest of patients (44), subsequently underwent multimodal treatment (final success of 95%). After logistic regression, variables positively associated with clearance of CBD were sex male (OR 3.5) and stent permanence ≥ 30 days (OR 3.2). Diameter of the stone ≥ 2 cm was associated with failure (OR 0.2). 7 post-ERCP pancreatitis, 6 post-sphincterotomy bleeding and 3 cholangitis occurred.

CONCLUSIONS

FCSEMS are useful in the approach of difficult lithiasis of CBD with no significant adverse events associated.

Biliary stents are forgotten more frequently in elderly patients

Background/aim

Plastic biliary stents that remain in situ for more than 12 months, called forgotten biliary stents (FBSs), can cause complications such as cholangitis, stent migration, stent occlusion, and perforation.

Materials and methods

The medical records of patients who underwent ERCP procedures from December 2016 to December 2020 were analysed retrospectively. Data on patient characteristics, indications for ERCP and stenting, stent types, stenting duration, complications, and causes of FBSs were obtained from the hospital’s database.

Results

A total of 48 cases with FBSs were analysed. The mean age (SD) of the patients was 71.23 years (±12.165), the male-to-female ratio was 23/25 (0.92), and the mean stenting duration was 27.12 months (range: 12–84 months). The most common indication for biliary stenting was irretrievable choledochal stones (40/48). Stone formation (79%) and proximal stent migration (26.4%) were the most frequent complications. The patients in the FBS group were significantly older than those from whom stents were removed in a timely manner (71.23 vs. 62.43 years, p < 0.001). Endoscopic treatment was possible in all cases; surgery was not required in any case. The most common cause of FBSs cited by patients was not having been informed about the need for long-term management of their stents (n = 14, 29.2%)

Conclusion

FBSs are potentially problematic particularly in elderly patients. Communication with the patient to remind them of the need for stent management is important for preventing FBSs.

Endoscopic management of difficult common bile duct stones: Where are we now? A comprehensive review

Endoscopic management for difficult common bile duct (CBD) stones still presents a challenge for several reasons, including anatomic anomalies, patients’ individual conditions and stone features. In recent years, variable methods have emerged that have attributed to higher stone removal success rates, reduced cost and lower adverse events. In this review, we outline a stepwise approach in CBD stone management. As first line therapy, endoscopic sphincterotomy and large balloon dilation are recommended, due to a 30%-50% reduction of the use of mechanical lithotripsy. On the other hand, cholangioscopy-assisted lithotripsy has been increasingly reported as an effective and safe alternative technique to mechanical lithotripsy but remains to be reserved in special settings due to limited large-scale evidence. As discussed, findings suggest that management needs to be tailored to the patient’s characteristics and anatomical conditions. Furthermore, we evaluate the management of CBD stones in various surgical altered anatomy (Billroth II, Roux-en-Y and Roux-en-Y gastric bypass). Moreover, we could conclude that cholangioscopy-assisted lithotripsy needs to be evaluated for primary use, rather than following a failed management option. In addition, we discuss the importance of dissecting other techniques, such as the primary use of interventional endoscopic ultrasound for the management of CBD stones when other techniques have failed. In conclusion, we recognize that endoscopic sphincterotomy and large balloon dilation, mechanical lithotripsy and intraductal lithotripsy substantiate an indication to the management of difficult CBD stones, but emerging techniques are in rapid evolution with encouraging results.

Comparison of the efficacy and safety between palliative biliary stent placement and duct clearance among elderly patients with choledocholithiasis: a propensity score-matched analysis

OBJECTIVES

This study aimed to evaluate and compare the outcomes of palliative endoscopic biliary stenting (EBS) and complete stone removal among elderly patients with choledocholithiasis using propensity score matching.

METHODS

From April 2012 to October 2017, 161 patients aged 75 years and older with choledocholithiasis underwent endoscopic retrograde cholangiopancreatography at our institution. Among them, 136 (84.5%) had complete stone removal, and 25 (15.5%) underwent palliative EBS without further intervention until symptom occurrence. The median age of the EBS group was significantly higher than that of the complete stone removal group. The proportion of patients with dementia, cerebral infarction, preserved gallbladder with gallstones, and surgically altered anatomy was higher in the EBS group than in the complete stone removal group. Propensity score matching was used to adjust for different factors. In total, 50 matched patients (n = 25 in each group) were analyzed.

RESULTS

The median duration of cholangitis-free periods was significantly shorter in the EBS group (596 days) than in the complete stone removal group. About half of patients in the EBS group required retreatment and rehospitalization for cholangitis during the observation period. Cholangitis was mainly caused by stent migration. There was no significant difference in terms of mortality rate and procedure-related adverse events between the two groups. Death was commonly attributed to underlying diseases. However, one patient in the EBS group died due to severe cholangitis.

CONCLUSIONS

Palliative EBS should be indicated only to patients with choledocholithiasis who have a poor prognosis.

Early cholangioscopy-assisted electrohydraulic lithotripsy in difficult biliary stones is cost-effective

BACKGROUND AND AIMS

Single-operator cholangioscopy-assisted electrohydraulic lithotripsy (SOC-EHL) is effective and safe in difficult choledocholithiasis. The optimal timing of SOC-EHL use, however, in refractory stones has not been elucidated. The following aims to determine the most cost-effective timing of SOC-EHL introduction in the management of choledocholithiasis.

METHODS

A cost-effectiveness model was developed assessing three strategies with a progressively delayed introduction of SOC-EHL. Probability estimates of patient pathways were obtained from a systematic review. The unit of effectiveness is complete ductal clearance without need for surgery. Cost is expressed in 2018 US dollars and stem from outpatient US databases.

RESULTS

The three strategies achieved comparable ductal clearance rates ranging from 97.3% to 99.7%. The least expensive strategy is to perform SOC-EHL during the first endoscopic retrograde cholangiography pancreatography (ERCP) (SOC-1: 18,506$). The strategy of postponing the use of SOC-EHL to the third ERCP (SOC-3) is more expensive (US$18,895) but is 2% more effective. (0.9967). SOC-EHL during the second ERCP in the model (SOC-2) is the least cost-effective. Sensitivity analyses show altered conclusions according to the cost of SOC-EHL, effectiveness of conventional ERCP, and altered willingness-to-pay (WTP) thresholds with early SOC-1 being the most optimal approach below a WTP cut-off of US$20,295.

CONCLUSIONS

Early utilization of SOC-EHL (SOC-1) in difficult choledocholithiasis may be the least costly strategy with an effectiveness approximating those achieved with a delayed approach where one or more conventional ERCP(s) are reattempted prior to SOC-EHL introduction.

Outcomes of Laparoscopic Common Bile Duct Exploration by Chopstick Technique in Choledocholithiasis

Background and Objectives

Laparoscopic cholecystectomy with common bile duct exploration (LC with LCBDE) remains the preferred technique for difficult common bile duct stone (CBDS) removal. The chopstick method uses commonly available instruments and may be cost-saving compared to other techniques. We studied the outcome of LCBDE using the chopstick technique to determine if it could be considered a first-choice method.

Methods

Data from all patients that underwent LCBDE from January 1, 2012 to April 30, 2019 were retrospectively analyzed. A standard 4-port incision and CBDS permitted extraction with two laparoscopic instruments by chopstick technique via vertical choledochotomy. Demographic data, stone clearance rate, surgical outcomes, complications, and other associated factors were evaluated.

Results

Thirty-two patients underwent LCBDE. The mean number of preoperative endoscopic retrograde cholangiopancreatography (ERCP) sessions was 2.4. In 65.5% of cases, the CBDS was completely removed by the chopstick technique, while 96.9% of stones were removed after using additional tools. The need for additional instruments was associated with increased age, increased numbers of stones, longer period from the latest ERCP session, and previous upper abdominal surgery. The conversion rate to open surgery was 28.1% and was significantly associated with a history of upper abdominal surgery.

Conclusion

The chopstick technique is a good alternative and could be considered as a first-line technique in LCBDE to remove the CBDS in cases with 1 to 2 large suprapancreatic CBDS due to instrument availability, cost-effectiveness, and comparable surgical outcomes.

Association of long-term endoscopic biliary stent placement with choledocholithiasis: a literature review

Endoscopic stone removal is currently the first-line procedure for the treatment of common bile duct stones. Advances in equipment and treatment techniques have expanded the scope of application of endoscopic treatment to include stones that have previously been difficult to remove endoscopically, such as stacked stones and large stones. For the treatment of common bile duct stones in elderly patients in particular, long-term placement of a biliary stent is increasingly being selected. Although periodic stent replacement is required, some reports have stated that biliary stenting is useful in terms of treatment-associated invasiveness and the incidence of accidental complications. To date, various opinions have been presented on whether the treatment of bile duct stones should aim for complete removal of stones or adopt the biliary stenting approach. Findings in previous reports suggest that both the approach for complete stone removal and the long-term stenting approach are associated with advantages and disadvantages. In this study, we reviewed previous reports on the significance of placing a stent and implementing careful monitoring rather than stone removal in patients with bile duct stones.

Effect of stent placement on stone recurrence and post-procedural cholangitis after endoscopic removal of common bile duct stones

BACKGROUND/AIMS

After endoscopic treatment of common bile duct (CBD) stones, recurrence of choledocholithiasis due to small stone fragments and post-endoscopic retrograde cholangiopancreatography (post-ERCP) cholangitis can occur. We determined the effect of biliary stenting after removal of CBD stones on the recurrence of CBD stones and the incidence of post-ERCP cholangitis.

METHODS

We performed a retrospective single-center study involving 483 patients who underwent ERCP for the removal of CBD stones. The patients were classified into two groups according to their biliary stenting status. The primary outcome was the rate of CBD stone recurrence and the secondary outcome was the incidence of post-ERCP cholangitis.

RESULTS

Among the 483 patients, 219 and 264 did and did not receive a biliary stent after CBD stone removal, respectively. The incidence of stone recurrence was 15.5% and 7.6% in the non-stenting and stenting groups (p = 0.006), respectively, while the incidence of post-ERCP cholangitis was 4.6% and 2.7% (p = 0.256). In a multivariate analysis, biliary stenting significantly reduced the stone recurrence rate (odds ratio, 0.30; p = 0.004).

CONCLUSION

Biliary stenting after the removal of CBD stones reduces the stone recurrence rate and assisted recovery. For patients with large and multiple stones who undergo lithotripsy, preventive biliary stent insertion can reduce the rate of stone recurrence.

Adding ursodeoxycholic acid to the endoscopic treatment and common bile duct stenting for large and multiple biliary stones: Will it improve the outcomes?

Background

The role of common bile duct (CBD) stenting in the establishment of bile stream in the elderly patients and the ones who are not good candidates for surgery due to not responding to treatments was well documented in previous studies. The current study aimed at investigating the effect of adding Ursodeoxycholic acid (UDCA) to CBD stenting alone in order to reduce the size of large and multiple CBD stones.

Methods

Clinical outcomes including success rates in CBD stones clearance, incidence of pancreatitis, perforation, bleeding, as well as, decrease in size of stones and liver enzymes after a two-month period were assessed in the UDCA + CBD stenting group.

Results

A total of 64 patients referring to Shahid Beheshti Hospital in Qom, Iran with multiple or large CBD stones (above three or larger than 15 mm) received standard endoscopic therapies and UDCA + CBD stenting (group B) and controls only received standard endoscopic therapies with only CBD stenting (group A). The mean reduction in the size of stones in group B was significantly higher than that of group A (3.22 ± 1.31 vs 4.09 ± 1.87 mm) (p = 0.034). There was no difference in the incidence rate of complications including pancreatitis, cholangitis, bleeding, and perforation between the two groups (P > 0.05).

Conclusion

Adding UDCA to CBD stenting, due to decrease in the stone size and subsequently facilitation of the stones outlet, can be considered as the first-line treatment for patients with large and multiple CBD stones. Also, in the cases with large or multi stones may be effective in reducing size and subsequently stone retrieval.

Trial registry The study protocol was approved by the Ethics Committee of Qom University of Medical Sciences (ethical code: IR.MUQ.REC.1397.075); the study was also registered in the Iranian Registry of Clinical Trials (No. IRCT20161205031252N8). This study adheres to CONSORT guidelines.

Predictive factors for extraction of common bile duct stones during endoscopic retrograde cholangiopancreatography in Billroth II anatomy patients

BACKGROUND

Endoscopic retrograde cholangiopancreatography (ERCP) for extraction of common bile duct (CBD) stones in Billroth II anatomy patients is still a technical challenge and factors affecting stone extraction have not yet been clarified. This study aimed to analyze our experience and evaluate potential factors affecting CBD stone extraction.

METHODS

A retrospective analysis of CBD stones patients with a history of Billroth II gastrectomy, who underwent therapeutic ERCP for stone extraction at our center from August 1999 to December 2017, was conducted. The outcomes of ERCP and potential factors affecting stone extraction were examined.

RESULTS

A total of 227 patients were enrolled, and 176 patients (77.5%) achieved technical success. The success rate of duodenal ampullary access and selective biliary cannulation was 84.1% (191/227) and 92.1% (176/191), respectively. The mean CBD diameter was 15 mm (range 6-35 mm), and the largest stone size was 13 mm (range 4-36 mm). CBD stones were ultimately removed in 137 patients (77.8%), and 105 patients (59.7%) for the first session. Mechanical lithotripsy was used in 17 patients (9.7%). The overall ERCP-related complication rate was 6.3% (11/176), including bleeding in 3 patients (1.7%) and mild pancreatitis in 6 patients (3.4%). The multivariate analysis indicated that CBD stone number ≥ 2 (OR 2.171; 95% CI 1.095-4.306; p = 0.027), and the largest CBD stone size ≥ 12 mm (OR 3.646; 95% CI 1.833-7.251; p < 0.001) were patient-related risk factors for failed stone removal; while the use of endoscopic papillary (large) balloon dilation (EPBD/EPLBD) (OR 0.291; 95% CI 0.147-0.576; p < 0.001) was a procedure-related protective factor for successful stone extraction.

CONCLUSIONS

ERCP is safe and effective for extraction of CBD stones in Billroth II anatomy patients. The number and the largest size of CBD stones, and the use of EPBD/EPLBD are predictive factors for CBD stone extraction.

Is complete stone removal for choledocholithiasis always necessary in extremely elderly patients?

BACKGROUND AND AIM

Endoscopic stone removal has some complications. Although the life expectancy of elderly patients has increased dramatically worldwide, little information is available on the necessity of complete endoscopic stone removal in extremely elderly patients. This study aimed to evaluate the safety and efficacy of complete endoscopic stone removal in extremely elderly patients.

METHODS

All extremely elderly patients (>90 years) who underwent endoscopic stone removal for choledocholithiasis at our hospital between January 2012 and January 2017 were retrospectively evaluated. The included patients were divided into complete stone removal and incomplete stone removal groups. Complication rate, overall survival (OS), and disease-specific survival (DSS) rates were compared between the two groups.

RESULTS

Overall, 73 patients were included in this study. The median number of stones was one (range, 0-10) and two (range, 1-12) (P = 0.043), while the median diameter of the largest stones was 9 (range, 0-27) and 14 (range, 5-46) mm (P = 0.001) in the complete and incomplete stone removal groups, respectively. During the follow-up period, OS was 60% and 39% and DSS was 95% and 97% in the complete and incomplete stone removal groups, respectively. Kaplan-Meier analysis found no significant difference in OS and DSS between the two groups (P = 0.052 and P = 0.646, respectively).

CONCLUSION

Complete stone removal might not always be necessary in extremely elderly patients aged ≥90 years.

Efficacy and safety of therapeutic ERCP in patients with ectopic papilla of Vater

It remains challenging for endoscopists to manage pancreaticobiliary diseases in patients with ectopic papilla of Vater by endoscopic retrograde cholangiopancreatography (ERCP). The present study sought to evaluate the efficacy and safety of ERCP for this issue.Consecutive patients with ectopic papilla of Vater who underwent initial ERCP due to pancreaticobiliary diseases were retrospectively analyzed.One hundred seven patients with ectopic papilla of Vater were included. The success rate of cannulation was 83.2%. Endoscopic sphincterotomy, endoscopic papillary balloon dilation, and mechanical lithotripsy were performed in 12 (11.2%), 25 (23.4%), and 1 (0.9%) patients, respectively. The technical success rate was 83.2%; of these, endoscopic nasobiliary drainage, endoscopic retrograde biliary drainage, endoscopic retrograde pancreatic drainage, and stone extraction was conducted in 61 (57.0%), 17 (15.9%), 5 (4.7%), and 45 (42.1%) patients, respectively. Bile duct stone size ≥1 cm, number ≥2, and duodenum stenosis were risk factors for stone extraction inability. Adverse events occurred in 20 (18.7%) patients, including post-ERCP pancreatitis (3.7%), hyperamylasemia (12.1%), and infection of biliary tract (2.8%); all of the adverse events were mild and alleviated by conventional therapies.ERCP is an appropriate choice for pancreaticobiliary diseases in patients with ectopic papilla of Vater due to its high efficacy and safety. Bile duct stone size ≥1 cm, number ≥2, and duodenum stenosis increase difficulties for stone extraction.

Consequences of Stenting and Endoscopic Papillary Balloon Dilatation in Treatment of Large and Multiple Common Bile Duct Stones

BACKGROUND Although stenting for the treatment of large and multiple common bile duct stones has been acceptable to everyone, its efficacy and outcome have not been studied in comparison with other endoscopic procedures. The purpose of this study was to compare the consequences of stenting and endoscopic papilla balloon dilatation for the treatment of large and multiple common bile duct stones. METHODS In a double-blind clinical trial, of 431 patients with bile duct stones referred to the treatment center, 64 patients with multiple common bile duct stones ( ≥ 3) and more than 15 cm were selected for the study, then by random allocation rule the participants were allocated in two groups. They were entered into two different endoscopic papillary balloon dilatation (EPBD) and common bile ducts stenting treatments so that both procedures were performed by a person. Both groups were assessed from the point of views therapeutic outcomes such as duct cleaning, pancreatitis, isolated pain, and duct rupture. Data were collected by a self-made questionnaire that was used before and after the procedure to obtain the needed information. Then data were analyzed using SPSS software version 22 and descriptive and analytical tests were used as appropriated. RESULTS Although the duct cleaning and the complete removal of the stones in the stenting treatment procedure was 93.8%, and in EPBD was 78.3%, no significant difference was observed between the two groups (p = 0.14). Pancreatitis significantly increased after the first and second endoscopic retrograde cholangiopancreatography (ERCP) in the stent group compared with EPBD (p = 0.02). Also, the most frequent cases of isolated pain were in the endoscopic group EPBD (p = 0.0). However, the occurrence of perforation after first ERCP and EPBD was zero, but in the second stage of ERCP, 3.3% of the patients had perforations (p = 0.99). The results indicated that the shape of the stone (circular and angled) was not effective in the result of treatment in the two groups. CONCLUSION The results of this study indicated that in case of experience and skill in conducting the ERCP, common bile duct stenting is still the first line of treatment for large and multiple stones of the common bile ducts.

Safety and Efficacy of Endoscopic Removal of Common Bile Duct Stones in Elderly Patients ≥90 Years of Age

Objective We examined the safety and efficacy of endoscopic stone removal for choledocholithiasis in elderly patients ≥90 years of age with native papilla and compared the outcomes with those in patients 75-89 years of age. Methods This multicenter retrospective study included 569 patients 75-89 years of age and 126 patients ≥90 years of age who had native papilla and underwent therapeutic endoscopic retrograde cholangiopancreatography (ERCP) for choledocholithiasis at 3 institutions in Japan between April 2012 and March 2018. The main outcomes assessed were the incidence of post-ERCP complications during hospitalization and outcomes of ERCP in patients ≥90 years of age. Results Biliary cannulation and subsequent endoscopic sphincterotomy, endoscopic balloon dilation, and endoscopic large balloon dilation were successful in 97.7% of patients 75-89 years of age and in 98.4% of patients ≥90 years of age. There was no significant difference in the incidence of post-ERCP complications between patients 75-89 years of age and those ≥90 years of age (7.7% vs. 9.5%, respectively; p=0.47). Although the rate of use of mechanical lithotripter was not significantly different, the rate of complete stone removal in patients ≥90 years of age was lower than that in patients 75-89 years of age (81.0% vs. 94.9%, respectively; p<0.001). In all cases with incomplete stone removal in both groups, permanent biliary stent placement was successful. Conclusion ERCP for choledocholithiasis in elderly patients ≥90 years of age is a safe and effective procedure; however, endoscopists should select appropriate strategies after considering each patient's medical condition and background.

ASGE guideline on the role of endoscopy in the evaluation and management of choledocholithiasis

Each year choledocholithiasis results in biliary obstruction, cholangitis, and pancreatitis in a significant number of patients. The primary treatment, ERCP, is minimally invasive but associated with adverse events in 6% to 15%. This American Society for Gastrointestinal Endoscopy (ASGE) Standard of Practice (SOP) Guideline provides evidence-based recommendations for the endoscopic evaluation and treatment of choledocholithiasis. The Grading of Recommendations Assessment, Development and Evaluation (GRADE) framework was used to rigorously review and synthesize the contemporary literature regarding the following topics: EUS versus MRCP for diagnosis, the role of early ERCP in gallstone pancreatitis, endoscopic papillary dilation after sphincterotomy versus sphincterotomy alone for large bile duct stones, and impact of ERCP-guided intraductal therapy for large and difficult choledocholithiasis. Comprehensive systematic reviews were also performed to assess the following: same-admission cholecystectomy for gallstone pancreatitis, clinical predictors of choledocholithiasis, optimal timing of ERCP vis-à-vis cholecystectomy, management of Mirizzi syndrome and hepatolithiasis, and biliary stent therapy for choledocholithiasis. Core clinical questions were derived using an iterative process by the ASGE SOP Committee. This body developed all recommendations founded on the certainty of the evidence, balance of risks and harms, consideration of stakeholder preferences, resource utilization, and cost-effectiveness.

Clinical characteristics and risk factors for stent-stone complex formation following biliary plastic stent placement in patients with common bile duct stones

BACKGROUND

Stent-stone complex (SSC) formation is one of the complications of endoscopic biliary stent placement. This study aimed to clarify the clinical characteristics and risk factors for SSC formation following plastic stent (PS) placement in patients with common bile duct (CBD) stones.

METHODS

We retrospectively reviewed the charts of 78 patients with CBD stones who had undergone 107 biliary stent placements as palliative treatment. Demographic, historical, and stent-related data were collected and analyzed.

RESULTS

At PS removal, SSC formations were observed in 18% of the 107 cases (SSC group) studied and not in the remaining 82% (non-SSC group). The duration of PS placement was significantly longer in the SSC group. The increase in CBD diameter during the stenting period as well as the incidence of cholangitis at PS removal was significantly greater in the SSC group. Multivariate analysis identified long-term (≥301 days) PS placement and the increase in CBD diameter during the stenting period as independent factors for SSC formation.

CONCLUSIONS

Long-term PS placement induces a risk of SSC formation in patients with CBD stones. The increase in diameter of CBD during the period of PS placement is a predictive factor for SSC formation in this situation.

Long-term prognosis after biliary stenting for common bile duct stones in high-risk elderly patients

OBJECTIVE

To evaluate the long-term outcomes of complete common bile duct (CBD) stone removal and biliary stenting in elderly patients (≥85 years) with CBD stones.

METHODS

We retrospectively examined 65 patients who underwent complete CBD stone removal (the duct clearance group) and 40 patients who underwent biliary stenting (the biliary stenting group) between July 2006 and March 2016. To reduce selection bias, we also conducted a propensity score matching analysis and generated 30 pairs of patients. Cholangitis recurrence-free survival and overall survival were compared between the two groups and independent prognostic factors of survival were identified by univariate and multivariate analyses.

RESULTS

Cholangitis recurrence-free survival was significantly better in the duct clearance group than in the biliary stenting group (P < 0.001). Their overall survival did not significantly differ after propensity score matching (P = 0.388). In all cohorts, univariate analysis demonstrated that poor performance status and biliary stenting were factors of poor prognosis, and in multivariate analysis only performance status remained associated with poor prognosis for survival. Similarly, in the propensity score-matched cohort, only performance status independently predicted poorer survival (hazard ratio [HR] 2.726, 95% confidence interval [CI] 1.105-6.675, P = 0.029). The choice of endoscopic treatment was not a significant factor associated with prognosis (HR 1.354, 95% CI 0.678-2.701, P = 0.391).

CONCLUSIONS

Biliary stenting was similar to complete stone removal in terms of prognosis for long-term survival. Biliary stenting for CBD stones could be an effective therapeutic tool in high-risk elderly patients.

Selective Antegrade Biliary Stenting Aids Emergency Laparoscopic Cholecystectomy

Background: Symptomatic gall stone disease requires early emergency treatment to prevent complications. This early treatment is often delayed due to difficulty in the diagnosis and management of concomitant choledocholithiasis. Intervention with preoperative endoscopic retrograde cholangiopancreatography (ERCP) is associated with complications and known to be unnecessary in most cases. We follow a strategy of providing early cholecystectomy with selective utility of antegrade stent in cases of choledocholithiasis. Our main aim is to present our technique and results. Method: We conducted a 3-year (January 2014 to January 2017) review of a prospectively maintained database of our practice of performing routine intraoperative cholangiogram (IOC) during laparoscopic cholecystectomy (LC) and when choledocholithiasis is encountered on IOC; a transcystic antegrade biliary stent is inserted to decompress the common bile ducts (CBD) and facilitate postoperative ERCP at later date. Results: Of the 411 cholecystectomies performed, 77.3% were females with mean age of 48 years. Seventy-four patients were found to have CBD stones (CBDS) on IOC. Antegrade stents were successfully deployed in 69 cases. Even though Antegrade stents were done more frequently in emergency admissions (P = .001); this did not increase the length of hospital stay (LOHS) (P = .752) or the rate of complications (P = .171). However, doing a preoperative ERCP significantly increased LOHS (P = .001), and 67% of these needed two or more ERCP for complete clearance of CBD and had more complications. Nine (15.2%) out of 59 patients with pancreatitis had CBDS on IOC and were successfully managed with antegrade stent. Conclusion: This strategy can be followed by general surgeons, enabling them to perform LC in the presence of choledocholithiasis during acute admissions including pancreatitis. It does not require any specialist skills in CBD exploration and also eliminates unnecessary preoperative ERCP and avoids its potential complications.

Long-term outcomes of endoscopic papillary balloon dilation for removal of bile duct stones in Billroth II gastrectomy patients

BACKGROUND

Endoscopic papillary balloon dilation (EPBD) for common bile duct (CBD) stones removal in Billroth II gastrectomy patients is feasible. However, the long-term outcomes of this technique are not clear. The aim of this study was to evaluate the procedural and long-term outcomes of EPBD for removal of CBD stones in Billroth II gastrectomy patients.

METHODS

The records of patients with previous Billroth II gastrectomy referred for CBD stones removal with endoscopic retrograde cholangiopancreatography (ERCP) between July 1, 2008 and September 1, 2016 were retrospectively reviewed. The main outcomes of stone clearance, ERCP-related adverse events, and stone recurrence were analyzed.

RESULTS

A total of 83 patients with previous Billroth II gastrectomy underwent ERCP in our center were reviewed. Forty-nine consecutive patients with previous Billroth II gastrectomy referred to EPBD for removal of CBD stones underwent 59 ERCP procedures were enrolled in the end. The overall successful CBD stones clearance was achieved in 42 patients (85.7%). ERCP-related adverse events was in 3 ERCP procedures (5.1%). Severe complications, including perforation and bleeding, were not observed. Six of 49 patients (12.2%) had stone recurrence after a median period of 22.5 months (range 6-71 months) from the end of stone removal treatment. Female [odds ratio (OR) = 11.352; 95% confidence interval (95% CI): 1.040-123.912; P = 0.046] and previous mechanical lithotripsy (OR = 13.423; 95% CI: 1.070-168.434; P = 0.044) were significantly associated with stone recurrence.

CONCLUSIONS

At long-term follow-up, EPBD for removal of CBD stones appeared to be safe and effective in Billroth II gastrectomy patients. Female and previous mechanical lithotripsy may be risk factors for stone recurrence.

Multiplanar Computed Tomography of Vascular Etiologies of Acute Abdomen: A Pictorial Review

Acute abdomen is a common presentation in the emergency department and radiologic imaging plays a pivotal role in the evaluation of such patients. Multi-detector computed tomography (MDCT) is the most commonly utilized radiologic investigation in such patients as it can be performed fairly rapidly and has excellent accuracy for diagnosing various causes of an acute abdomen. Additionally, MDCT may also reveal clues towards an alternative diagnosis that was not even suspected on the basis of a history and physical examination. Consequently, it is indispensable for radiologists to be able to accurately and efficiently recognize imaging features of disorders that may present as an acute abdomen. While gastrointestinal, hepatobiliary and genitourinary causes account for most cases of acute abdomen, vascular etiologies may also be implicated in a small-but significant-proportion of cases. Therefore, in this pictorial review, we describe the typical MDCT imaging features of various vascular etiologies that may present as an acute abdomen.

Endoscopic Management of Difficult Bile Duct Stones

PURPOSE OF REVIEW

In 10-15% of the cases, conventional methods for removing bile duct stones by ERCP/balloon-basket extraction fail. The purpose of this review is to describe endoscopic techniques in managing these "difficult bile duct stones."

RECENT FINDINGS

Endoscopic papillary large balloon dilation with balloon extraction ± mechanical lithotripsy is the initial approach used to retrieve large bile duct stones. With advent of digital cholangioscopy, electrohydraulic and laser lithotripsy are gaining popularity. Enteroscopy-assisted or laparoscopic-assisted approaches can be used for those with gastric bypass anatomy. Difficulties in removing bile duct stones can be related to stone-related factors such as the size and location of the stone or to altered anatomy such as stricture in the bile duct or Roux-en-Y anatomy. Several endoscopy approaches and techniques have described in the recent past that have greatly enhanced our ability to remove these "difficult" bile duct stones.

Complex biliary stones management: cholangioscopy versus papillary large balloon dilation - a randomized controlled trial

BACKGROUND AND STUDY AIMS

 Endoscopic removal of biliary stones has high success rates, ranging between 85 % to 95 %. Nevertheless, some stones may be challenging and different endoscopic methods have evolved. Papillary large balloon dilation after sphincterotomy is a widely used technique with success rates ranging from 68 to 90 % for stones larger than 15 mm. Cholangioscopy allows performing lithotripsy under direct biliary visualization, either by laser or electrohydraulic waves, which have similar success rate (80 % - 90 %). However, there is no study comparing these 2 techniques.

PATIENTS AND METHODS

 From April 2014 to June 2016, 100 patients were enrolled and randomized in 2 groups, using a non-inferiority hypothesis: cholangioscopy + electrohydraulic lithotripsy (group 1) and endoscopic papillary large balloon dilation (group 2). The main outcome was complete stone removal. Adverse events were documented. Mechanical lithotripsy was not performed. Failure cases had a second session with crossover of the methods.

RESULTS

 The mean age was 56 years. 74 (75.5 %) patients were female. The initial overall complete stone removal rate was 74.5 % (77.1 % in group 1 and 72 % in group 2, P  > 0.05). After second session the overall success rate achieved 90.1 %. Procedure time was significantly lower in group 2, - 25.2 min (CI95 % - 12.48 to - 37.91). There were no significant differences regarding technical success rate, radiologic exposure and adverse events.

CONCLUSION

 Single-operator cholangioscopy-guided lithotripsy and papillary large balloon dilation are effective and safe approaches for removing complex biliary stones.

Management of endoscopic biliary stenting for choledocholithiasis: Evaluation of stent-exchange intervals

AIM

To evaluate the best management of plastic stents in patients with choledocholithiasis who were unfit for endoscopic stone removal or surgery.

METHODS

Between April 2007 and September 2017, 87 patients (median age 83.7 years) with symptomatic choledocholithiasis were treated with insertion of 7-Fr plastic stents because complete endoscopic stone retrieval was difficult, and their general condition was not suitable for surgery. Seventy of these patients agreed to regular stent management and stent exchange was carried out at every 6 mo (Group A, n = 35) or every 12 mo (Group B, n = 35). The remaining 17 patients did not accept regular stent exchange, and stents were replaced when clinical symptoms appeared (Group C). We evaluated the frequency of biliary complication and stent patency rate during follow-up periods.

RESULTS

The patency rate of biliary plastic stents was 91.4% at 6 mo (Group A) and 88.6% at 12 mo (Group B), respectively. Acute cholangitis occurred in 2.9% of Group A patients and in 8.6% of Group B patients. In Group C, median stent patency was 16.3 mo, and stent exchange was carried out in 70.6% of cases because of acute cholangitis or obstructive jaundice. Although a high incidence of acute cholangitis occurred, there was no biliary-related mortality.

CONCLUSION

Plastic stent exchange at 12-mo intervals is considered a safe procedure for patients with choledocholithiasis. Long-term biliary stenting increases biliary complications, but it can be an acceptable option for select patients who are medically unfit for further invasive procedures.

Experimental study on the friction effect of plastic stents for biliary stone fragmentation (with video)

BACKGROUND AND AIM

In patients with irretrievable or intractable bile duct stone, temporary insertion of a plastic stent (PS) followed by further endoscopic retrograde cholangiopancreatography (ERCP) or surgery has been recommended as a 'bridge' therapy. However, the exact mechanism of stone fragmentation has not been discovered. The aim of the present study was to evaluate whether PS shape can facilitate stone fragmentation.

METHODS

Using a new in vitro bile flow phantom model, we compared the friction effect among three different PS groups (straight PS group, double pigtail-shaped PS group, and screw-shaped PS group) and a control group. Each group had 10 silicon tube blocks that separately contained one stone and two PS. The control group had 10 blocks each with only a stone and no PS. We carried out analysis of the friction effect by stone weight and volume changes among the groups, excluding fragmented stones.

RESULTS

After 8 weeks, complete fragmentation was noted in one out of 34 cholesterol stones (2.9%) and in four out of six pigmented stones (66.7%). Fragmentation tended to be more prominent in the screw-shaped PS group than in the straight PS group, double pigtail-shaped group, and control group (volume change: -11.33%, 7.94%, 4.43%, and 2.05%, respectively, P = 0.1390; weight change: -9.30%, 0.71%, -0.10%, and -1.23%, respectively, P = 0.3553).

CONCLUSION

Stone fragmentation may be induced by PS friction effect. Also, screw-shaped plastic stents may improve friction effect. These results may help guide future PS development and clinical decisions.

Insertion of fully covered self-expanding metal stents in benign biliary diseases

INTRODUCTION

Benign biliary diseases are traditionally treated using plastic stents. However, fully covered self-expanding metal stents are currently gaining acceptance for the treatment of these pathologies.

OBJECTIVE

To assess the effectiveness and complications associated with the placement of temporary endoscopic fully covered self-expanding metal stents for the treatment of benign biliary diseases.

MATERIALS AND METHODS

This was a retrospective and observational study using a prospective database from a tertiary care center from March 2012 to May 2016. Some patients that had a fully covered metal stent due to a benign biliary disease were also included. The indications, resolution, technical success rates and adverse events were documented.

RESULTS

31 patients were included with a total of 34 stents inserted. The indications were as follows: 8 (25%) post cholecystectomy biliary stenoses, 11 (31%) large or multiple choledocholithiasis, 3 (8.3%) biliary fistulas, 2 (6%) post-liver transplant stenoses, 2 (8.3%) papillary stenoses, 2 (6%) perforations and 2 (6%) bleeds. The global resolution success rate of the stents for all pathologies was 88%, this included 87.5% (7/8) in post cholecystectomy stenoses, 73% (8/11) in large choledocholithiasis and 100% for the remaining indications. Thirty-three of 34 stents were removed after an average of 133 days (ranging from 10 to 180 days). No complications were registered.

CONCLUSION

Fully covered self-expanding metal stents are an effective and reliable alternative for the resolution of benign biliary diseases.

Multiple plastic biliary stent placement in the management of large and multiple choledochal stones: single center experience and review of the literature

INTRODUCTION

Endoscopic retrograde cholangiopancreatography (ERCP) with sphincterotomy is the first step treatment modality of choledocholithiasis. In spite of an extended sphincterotomy, 10-15% of complex choledochal stones (larger than 15 mm and/or more than 3 stones) cannot be removed and recurrent ERCP procedures may be needed.

AIM

To evaluate the role and efficiency of multiple biliary stent application in the treatment of large and multiple choledochal stones.

MATERIAL AND METHODS

Patients with complex choledochal stones and patients with inadequate choledochal clearance during ERCP were included in the study. The study group was divided into 2 groups as the placement of single (n = 27 patients) or multiple stents (n = 58 patients). After a mean time interval of 21 days (10-28), the ERCP procedure was tried for the second time and a stent was placed in case of recurrence.

RESULTS

Successful biliary drainage was provided in both groups. The decrease in the longitudinal or transverse size of the stones after stent placement was found to be statistically significant in both groups (p = 0.001). Cholestatic enzymes (alkaline phosphatase (ALP), γ-glutamyltransferase (GGT)) and bilirubin levels decreased significantly in both groups following stenting (p = 0.001). Additionally, multiple stents functioned as a bridge starting from the first ERCP to full clearance in patients with large and multiple stones which could not be removed at once and saved them from the possible morbidities of an invasive operation.

CONCLUSIONS

Endoscopic multiple biliary stent placement should be preferred in the treatment of patients with complex choledochal stones and high rates of co-morbidity, as a safe alternative to surgery.

The Stent Patency and Migration Rate of Different Shaped Plastic Stents in Bile Flow Phantom Model and In Vivo Animal Bile Duct Dilation Model

BACKGROUND/AIM

In research and development of biliary plastic stents (PS), continuous efforts have been made to overcome short patency time and high rate of migration. The aim of this study was to evaluate the patency and migration rate of different PS shapes for a given period of time.

METHODS

Using an in vitro bile phantom model, we compared the patency among different shapes of PS (three straight PS, four double-pigtail PS, and a new screw-shaped PS). We performed an analysis of the degree of luminal narrowing by light microscopic examination. Using an in vivo swine model, we compared the patency and migration rate among the three different types of PS.

RESULTS

Eight weeks after the bile exposure in the bile flow phantom model, 80 PS were retrieved and analyzed. The straight PS showed less biofilm formation and luminal narrowing than other types of PS (p < 0.05). Forty-nine PS were inserted into the dilated bile ducts of 10 swine models, and 39 PS were successfully retrieved 8 weeks later. The stent migration occurred less frequently in the double-pigtail PS and the screw-shaped PS than it did in the straight PS (11.1, 10, and 27.3%, respectively). However, there was no statistical difference in stent patency among the different shapes.

CONCLUSIONS

Stent patency may not be significantly different depending on the shape of PS for 8 weeks. The screw-shaped PS showed similar patency and migration rate to the double-pigtail PS. These results may help guiding future PS development and clinical decisions.

Complications and management of forgotten long-term biliary stents

AIM

To evaluate complications and management outcomes of retained long-term plastic biliary stents.

METHODS

Endoscopic plastic biliary stent placement was performed in 802 patients at Yeungnam University Hospital between January 2000 and December 2014. Follow-up loss with a subsequently forgotten stent for more than 12 mo occurred in 38 patients. We retrospectively examined the cause of biliary stent insertion, status of stents, complications associated with biliary stents and management outcomes of long-term plastic biliary stents. Continuous variables were analyzed using the t test. Observed frequencies in subsets of the study population were compared using Fisher’s exact test and χ² tests. Statistical significance was defined as P < 0.05 (two-tailed).

RESULTS

Mean age of patients was 73.7 ± 12 years and male-to-female ratio was 2.2:1. Indications of plastic biliary stent insertion were bile duct stones (63.2%, 24/38) and benign bile duct stricture (52.6%, 20/38). Mean duration of retained plastic stent was 22.6 ± 12.2 mo, and in 10 cases (26.3%), stents were retained for more than 24 mo. Common bile duct (CBD) stones or sludge were found in most cases (92.1%, 35/38). The most common complication was acute cholangitis (94.7%, 36/38). Stent removal by endoscopic approach was successfully performed in 92.1% (35/38) of the cases. In 3 cases, an additional plastic stent was inserted alongside the previous stent due to failure of the stent removal. Endoscopic removal of bile duct stones was successful in 73.7% (28/38) of the cases. When patients were divided into two groups by duration of stent placement (12 to 24 mo vs over 24 mo), there were no differences in the development of cholangitis, presence of biliary stones, and success rate of endoscopic removal of stones and biliary stents.

CONCLUSION

The most common complication of retained long-term plastic biliary stents was acute cholangitis associated with CBD stones. Endoscopic management was successfully performed in most cases.

Covered self-expanding metal stents for the management of common bile duct stones

BACKGROUND AND AIMS

Little medical literature exists for the use of fully covered self-expanding metal stents (CSEMSs) in the management of retained common bile duct (CBD) stones. Our aim was to assess the safety and efficacy of CSEMSs for the indication of retained "difficult" CBD stones.

METHODS

This retrospective cases series included 44 patients (30 women; median age, 69 years [range, 24-88]) who underwent CSEMS insertion for the indication of retained "difficult" CBD stones in 2 tertiary referral centers. Patients underwent temporary placement of CSEMSs after incomplete stone clearance at ERCP. Follow-up ERCP was arranged for stent removal and subsequent attempt at duct clearance. Procedure-related adverse events were also recorded.

RESULTS

Successful biliary drainage was achieved in all cases after CSEMS placement. Forty-two stents were removed with successful duct clearance achieved in 36 cases (82%) after a median in-stent duration of 8 weeks. There were 10 cases (22.7%) of stent migration, all noted incidentally during follow-up. One patient died of nonbiliary causes before attempted removal.

CONCLUSION

This is the largest published retrospective case series for use of CSEMSs for management of retained CBD stone disease to date. We have shown high success rates for this indication. A well-designed, multicenter, randomized controlled trial might address the uncertainty of cost-to-benefit ratio and appropriate duration for CSEMSs to be left in situ. Specific stent modification for this indication, including wider distal flare and retrieval purse string loop, may also be useful.

Endoscopic Management of the Difficult Bile Duct Stones: A Single Tertiary Center Experience

Background. Most common bile duct (CBD) stones can be removed with standard techniques using endoscopic retrograde cholangiopancreatography (ERCP), but in some cases additional methods are needed. In this study we aimed to investigate the management of patients with difficult stones and the factors that affect the outcome of patients that have undergone periodic endobiliary stenting. Materials and Methods. Data of 1529 patients with naive papilla who had undergone ERCP with an indication of CBD stones was evaluated retrospectively. Stones that could not be removed with standard techniques were defined as “difficult stones.” Cholangiograms of patients who had difficult stones were revised prospectively. Results. Two hundred and eight patients (13.6%) had difficult stones; 150 of these patients were followed up with periodic endobiliary stenting and successful biliary clearance was achieved in 85.3% of them. Both CBD (p < 0.001) and largest stone size (p < 0.001) were observed to be significantly reduced between the first and the last procedure. This difference was even more significant in successfully treated patients. Conclusions. Periodic endobiliary stenting can be used as an effective treatment for patients with difficult stones. Sizes of the CBD and of the largest stone are independent risk factors that affect the success rate.

Endoscopic biliary stenting in irretrievable common bile duct stones: stent exchange or expectant management-tertiary-centre experience and systematic review

INTRODUCTION

Conventional endoscopic duct clearance may not be possible in up to 10%-15% of common bile duct stones (CBDS). Sphincterotomy and biliary drainage by endoprosthesis have for many years been the mainstay of management in irretrievable stones. Recent years have seen the advent of sphincteroplasty or cholangioscopically-guided electrohydraulic lithotripsy (EHL) permitting duct clearance in majority of cases. However, when bile duct clearance is not possible, options include long-term stenting followed by elective stent exchange (ESE) 6-12 monthly or permanent stent insertion (PSI) in selected cases, but it is not clear which management strategy among ESE and PSI is preferable.

METHODS AND AIMS

A retrospective review of all patients in Leeds Teaching Hospitals NHS Trust who underwent plastic stent insertion for biliary access for difficult CBDS from January 2006 to December 2011 was undertaken. Adult patients with irretrievable CBDS who had plastic stent insertions throughout the follow-up period were included. Patients who underwent PSI and ESE annually were retrospectively reviewed to determine the long-term outcomes. A detailed systematic review was also performed, examining the outcomes of CBDS managed with stents.

RESULTS

During the study period, 674 patients underwent 1769 biliary-stent-related procedures; of which, 246 patients met our inclusion criteria. 201 patients had subsequent duct clearance. 45 patients were, therefore, included in the final analysis, 28 of whom underwent annual ESEs and 17 PSIs. Patients in the PSI group had higher American Society of Anesthesiologists (ASA) scores compared with the ESE group. In the PSI group, 9/17 patients presented acutely with blocked stents, 5 of whom presented within 12 months. 2/9 patients were severely ill and died within a fortnight following the repeat endoscopic retrograde cholangiopancreatography (ERCP). In the ESE group, 4/28 patients had duct clearance in subsequent ERCPs, 1/28 patient presented with a blocked stent, and no biliary-related deaths were observed. The mean numbers of ERCPs performed were 0.52 and 1.95 in the PSI and ESE groups, respectively.

CONCLUSIONS

Over 50% of patients treated with long-term stenting re-presented acutely with stent blockage, though many of these were before 12 months, meaning planned stent exchange would not have affected the outcome. Duct clearance using all possible modalities is the preferred option, but where not possible, management with biliary stenting either with elective exchange or permanent stenting remains a possibility for carefully selected patients, though maybe best suited to those with limited life expectancy.

Short-Term Biliary Stent Placement Contributing Common Bile Duct Stone Disappearance with Preservation of Duodenal Papilla Function

Aims. To investigate the effect of biliary stent placement without endoscopic sphincterotomy (EST) on common bile duct stones (CBDS) disappearance and the contribution of preserving the duodenal papilla function to reduce recurrence of CBDS. Methods. Sixty-six patients admitted for acute obstructive cholangitis due to CBDS who underwent biliary stent placement without EST for 2 years from March 2011 were evaluated retrospectively. The second endoscopic retrograde cholangiopancreatography (ERCP) was performed for treatment of CBDS 3 to 4 months after the first ERCP. We estimated the rate of stone disappearance at the time of second ERCP. Results. CBDS disappearance was observed in 32 (48.5%) of 66 patients. The diameter of the bile ducts and the diameter of CBDS in patients with CBDS disappearance were significantly smaller than in those with CBDS requiring extraction (p = 0.007 and p < 0.001, resp.). Stone disappearance was evident when the diameter of bile ducts and that of CBDS were <10 and 7 mm, respectively (p = 0.002). Conclusions. Short-term stent placement without EST eliminates CBDS while preserving duodenal papilla function and may be suitable for treating CBDS in patients with nondilated bile ducts and small CBDS.

Current Status of Biliary Metal Stents

Many advances have been achieved in biliary stenting over the past 30 years. Endoscopic stent placement has become the primary management therapy to relieve obstruction in patients with benign or malignant biliary tract diseases. Compared with plastic stents, a self-expandable metallic stent (SEMS) has been used for management in patients with malignant strictures because of a larger lumen and longer stent patency. Recently, SEMS has been used for various benign biliary strictures and leaks. In this article, we briefly review the characteristics of SEMS as well as complications of stent placement. We review the current guidelines for managing malignant and benign biliary obstructions. Recent developments in biliary stenting are also discussed.