Needle-knife fistulotomy versus needle-knife precut papillotomy for the treatment of common bile duct stones

Precut Over a Pancreatic Duct Stent Versus Transpancreatic Precut Sphincterotomy for Difficult Biliary Cannulation in Endoscopic Retrograde Cholangiopancreatography: A Retrospective Cohort Study

BACKGROUND

Precut over a pancreatic duct stent (PPDS) and transpancreatic precut sphincterotomy (TPS) with immediate pancreatic duct stent placement are techniques employed to promote biliary access during endoscopic retrograde cholangiopancreatography (ERCP) in cases of challenging biliary cannulation. However, limited data are available to compare the efficacy of these two pancreatic stent-assisted precut sphincterotomy techniques.

AIMS

The aim of this study was to compare the efficacy of PPDS versus TPS.

METHODS

A retrospective analysis was performed on the clinical data of consecutive patients who underwent ERCP between April 1, 2019 and May 31, 2023. According to the selected cannulation approaches, patients were assigned to two groups. In the PPDS group, a pancreatic duct stent was initially placed, followed by needle-knife precut over the stent. In the TPS group, transpancreatic precut sphincterotomy was initially performed, followed by immediate pancreatic stent placement. The success rate of biliary cannulation and the incidence of post-ERCP pancreatitis (PEP) between the two groups were analysed.

RESULTS

Among 864 patients who underwent ERCP, 46 patients were equally enrolled in the two groups. Selective bile duct cannulation was successfully achieved in 42 out of 46 (91.3%) cases using the PPDS and in 32 out of 46 (69.6%) cases using TPS technique alone, indicating significantly higher success rate of bile duct cannulation with PPDS compared to TPS (91.3% vs. 69.6%, P = 0.009). The overall success rates for bile duct cannulation were 93.5% and 97.8% in the PPDS and TPS groups, respectively, with no significant difference identified (P = 0.307). PEP occurred in 0 and 4 (8.7%) cases in the PPDS and TPS groups, respectively, with no significant difference between the two groups (8.7% vs. 0%, P = 0.117). There were no cases of bleeding or perforation in either group.

CONCLUSIONS

Both PPDS and TPS followed by immediate pancreatic duct stent placement are viable options. TPS stands out for its simplicity and cost-effectiveness, while PPDS is more appropriate for patients who are at a high-risk of developing PEP.

Needle-Knife Fistulotomy Versus Needle-Knife Papillotomy in Difficult Biliary Cannulation: A Systematic Review and Meta-Analysis

Background

Endoscopic retrograde cholangiopancreatography (ERCP) is an essential endoscopic therapeutic modality for biliary and pancreatic diseases. Needle-knife fistulotomy (NKF) and papillotomy (NKP) are the two most commonly used rescue techniques for patients with difficult biliary cannulation. However, there remains a need for comparative studies on these approaches to inform clinical decision-making. This meta-analysis aimed to evaluate the efficacy and safety of NKF compared to NKP as a rescue technique in difficult biliary cannulation after failed conventional ERCP.

Methods

We searched PubMed, Scopus, Embase, and Web of Science databases through November 2023 to include all studies that directly compared the outcomes of NKF with NKP in difficult biliary cannulation. Single-arm studies were excluded. Pooled odds ratios (ORs) and 95% confidence intervals (CIs) for dichotomous data related to clinical events were calculated using the Mantel-Haenszel method within a random-effect model. The primary outcome was the biliary cannulation success rate.

Results

Four studies with 823 patients (n = 376 NKF vs. n = 447 NKP) were included in our analysis. There was no significant difference between the two groups in biliary cannulation success rate (91.7% vs. 86.9%, respectively; OR = 1.54, 95% CI: 0.21 - 2.49, P = 0.14; I2 = 0%). However, the overall rate of adverse events was significantly lower in the NKF group than in the NKP group (OR = 0.46, 95% CI: 0.25 - 0.84, P = 0.01). Pancreatitis (OR = 0.23, 95% CI: 0.05 - 1.11, P = 0.07) and bleeding (OR = 1.43, 95% CI: 0.59 - 3.46, P = 0.42) were similar between the two groups. No significant differences in cholangitis, cholecystitis, perforation, or mortality were observed.

Conclusions

Our meta-analysis indicates comparable success rates in comparing NKF and NKP techniques for difficult biliary cannulation after failed conventional ERCP cannulation. Notably, the NKF technique significantly reduces overall adverse events compared to NKP, suggesting that NKF may be preferable due to its favorable safety profile. Additional randomized controlled trials (RCTs) are warranted to evaluate the interval benefit of an NKF technique.

Impact of duodenal papilla anatomy on needle knife papillotomy safety and efficacy in patients with difficult biliary canulation

BACKGROUND AND AIMS

Needle-knife papillotomy (NKP) is widely performed when biliary cannulation is difficult during endoscopic retrograde cholangiopancreatography (ERCP). However, its safety and efficacy in different types of duodenal papilla are not clear.

PATIENTS AND METHODS

This retrospective study analyzed 217 patients with difficult biliary cannulation who underwent NKP during ERCP procedures from June 2013 to May 2022 in our institution. Patients were classified according to Haraldsson classification type of duodenal papilla: type 1, regular; type 2, small; type 3, protruding or pendulous; and type 4, creased or ridged. Outcome measures were successful biliary cannulation and incidence of adverse events.

RESULTS

Haraldsson classification was type 1 in 115 patients, type 2 in 29, type 3 in 52, and type 4 in 21. Biliary cannulation was successful in 166 patients (76.5%) Success rates according to Haraldsson type were as follows: type 1, 74.8%; type 2, 82.8%; type 3, 80.8%; and type 4, 66.7%. The rates did not significantly differ among the types (p = 0.48). Overall incidence of adverse events was 9.22%. Incidence of adverse events did not significantly differ among the types (p = 0.69).

CONCLUSIONS

NKP was useful to achieve successful cannulation in patients with difficult biliary cannulation. The rate of successful cannulation and incidence of adverse events were similar among the different types of duodenal papilla.

Safety and feasibility of opening window fistulotomy as a new precutting technique for primary biliary access in endoscopic retrograde cholangiopancreatography

BACKGROUND/AIMS

Post-endoscopic retrograde cholangiopancreatography pancreatitis (PEP) is the most common and serious complication of endoscopic retrograde cholangiopancreatography. To prevent this event, a unique precutting method, termed opening window fistulotomy, was performed in patients with a large infundibulum as the primary procedure for biliary cannulation, whereby a suprapapillary laid-down H-shaped incision was made without touching the orifice. This study aimed to assess the safety and feasibility of this novel technique.

METHODS

One hundred and ten patients were prospectively enrolled in this study. Patients with a papillary roof size ≥10 mm underwent opening window fistulotomy for primary biliary access. In addition, the incidence of complications and success rate of biliary cannulation were evaluated.

RESULTS

The median size of the papillary roof was 6 mm (range, 3-20 mm). Opening window fistulotomy was performed in 30 patients (27.3%), none of whom displayed PEP. Duodenal perforation was recorded in one patient (3.3%), which was resolved by conservative treatment. The cannulation rate was high (96.7%, 29/30 patients). The median duration of biliary access was 8 minutes (range, 3-15 minutes).

CONCLUSION

Opening window fistulotomy demonstrated its feasibility for primary biliary access by achieving great safety with no PEP complications and a high success rate for biliary cannulation.

Suprapapillary Needle Knife Fistulotomy Versus Conventional Precut Sphincterotomy in Difficult Biliary Cannulation: A Retrospective Comparative Study

BACKGROUND

Endoscopic retrograde cholangiopancreatography (ERCP) is an important therapeutic tool for many biliary diseases. Selective biliary cannulation is the first step of the treatment process. Needle knife fistulotomy (NKF) and conventional precut sphincterotomy (CPS) are widely used in difficult biliary cannulation. However, there are different results in their effectiveness and safety. This study aimed to compare both methods regarding cannulation success and adverse event profile.

MATERIALS AND METHODS

All eligible consecutive patients with naive papillae who underwent biliary ERCP by a single experienced endoscopist over a 3-year period were included retrospectively. The standard cannulation method with a guidewire-loaded sphincterotome was initially used for biliary cannulation in all patients. Cannulation was accepted as difficult in the case of failure of standard cannulation within 5 minutes or despite 5 attempts or insertion of the guidewire to the pancreatic duct 5 times. Three modalities in patients with difficult biliary cannulation were employed according to the structure and configuration of the papillae in addition to unintentional pancreatic cannulation: (1) NKF, (2) CPS, (3) Double guidewire technique or guidewire orientation/precut following pancreatic stenting. Latter was excluded to enable direct comparison between NKF and CPS groups.

RESULTS

A total of 644 patients were recruited. Analyses were performed with 541 patients after the exclusion of 103 patients. Mean (SD) age was 60.4 (18.2) years, and 257 (47.5%) patients were male. While standard cannulation was successful in 366 (67.6%), difficult biliary cannulation was observed in 175 (32.4%) patients. NKF was performed in 101 (57.7%) patients, and cannulation success was 100% in the first ERCP session. In contrast, CPS was performed in 74 (42.3%) patients with a lower cannulation success rate (79.7%) than NKF ( P <0.001). Post-ERCP pancreatitis rate was higher in CPS (9.5%) than NKF group (3.0%, P =0.063). Bleeding and cholangitis were similar in both groups.

CONCLUSIONS

In patients with difficult biliary cannulation with appropriate papillary structure and configuration, NKF should be used as the first choice in experienced hands because of high biliary cannulation success and low Post-ERCP pancreatitis risk.

The Safety and Efficacy of an Unflanged 4F Pancreatic Stent in Transpancreatic Precut Sphincterotomy for Patients with Difficult Biliary Cannulation: A Prospective Cohort Study

Prophylactic pancreatic stenting effectively reduces the rate and severity of post-ERCP pancreatitis (PEP) in the precut technique; however, studies on the optimal type and duration of the stent are still lacking. This prospective study evaluated the incidence and severity of PEP and the rate of spontaneous stent dislodgement in patients undergoing transpancreatic precut sphincterotomy (TPS) accompanied by prophylactic pancreatic stenting with an unflanged plastic stent (4F × 5 cm) for difficult biliary cannulation. A total of 247 patients with naïve papilla were enrolled in this study, and data were collected prospectively. In the final analysis, 170 and 61 patients were included in the standard cannulation technique and TPS groups, respectively. The incidence of PEP in the standard cannulation technique and TPS groups was 3.5% and 1.6% (p = 0.679), respectively. The technical success rate of selective biliary cannulation in the TPS group was 91.8%. The spontaneous dislodgement rate of the prophylactic plastic stent was 98.4%. In conclusion, an unflanged pancreatic stent (4F × 5 cm) placement in TPS for patients with failed standard cannulation technique is a safe and effective measure due to low adverse events and few additional endoscopic procedures for removing the pancreatic duct (PD) stent.

Basic and Advanced Biliary Cannulation: How Do I Do It?

Successful biliary cannulation of a native papilla is usually the rate-limiting step toward a successful ERCP. Standard cannulation techniques usually succeed, particularly when utilizing the wire-guided technique. There are, however, a myriad of confirmations of the major papilla as well as anatomic variants and certain pathologies which can make cannulation exceedingly difficult. For these cases, advanced cannulation techniques and techniques termed "access sphincterotomy" have been developed which should allow successful cannulation in >90% of cases. This article should help all those performing ERCP to improve their cannulation rate.

Success and Safety of Needle Knife Papillotomy and Fistulotomy Based on Papillary Anatomy: A Prospective Controlled Trial

BACKGROUND

Needle knife papillotomy (NKP) and fistulotomy (NKF) are the two most commonly used rescue techniques for patients with difficult biliary cannulation (DBC). Anatomy of the major duodenal papillae (MDP) influences the optimal precut technique for biliary access. However, comparative studies of the success and safety of NKP and NKF based on the anatomy of MDP have been scarce.

METHODS

Patients with intact MDPs for therapeutic endoscopic retrograde cholangio-pancreatography (ERCP) in our center were enrolled. Early needle knife precuts were uniformly applied to patients with DBC. Difficult MDPs were classified into one of five types based on their endoscopic anatomy. Each type of MDP was allocated to NKP or NKF treatment. Patients with types 1 and 2 papillae always received NKF, 3 and 4 received NKP, and 5 could receive either. The safety and efficacy were analyzed between NKP and NKF, and among different types of MDPs.

RESULTS

A total of 188 out of 1674 patients undergoing ERCP satisfied the criteria for early precutting: 75 patients were assigned to the NKP group and 113 to the NKF group. The total initial success rate of biliary cannulation (ISRBC) of the precut techniques (both NKP and NKF) for patients with DBC was 91.5%. The ISRBC of patients of the NKP group was similar to that of the NKF group (90.7% vs 92.0%, P > 0.05). The ISRBC of the patients in the swollen MDP subgroup (96.1%) was higher than that of patients in the distorted MDP subgroup (81.8%, P = 0.030). The total and specific complications of the patients of the NKP group were similar to those of the NKF group (P > 0.05).

CONCLUSIONS

NKP and NKF, as selected on the basis of MDP anatomy, are equally safe and highly efficient for patients with DBC to allow biliary cannulation. Patients with swollen MDPs had a higher ISRBC than patients with distorted MDPs. Selecting a precut method based on MDP anatomy is an effective and safe strategy for patients with DBC.

Needle knife fistulotomy in flat and diverticular papillae: Is it time for redemption?

BACKGROUND

European Society of Gastrointestinal Endoscopy (ESGE) recommends needle-knife fistulotomy (NKF) as the preferred precut technique in cases when standard cannulation techniques fail. Despite scarce scientific evidence, flat and diverticular papillae are thought not to be ideal for NKF, as they are associated with poor outcomes. The present study aimed to determine the outcomes of the use of NKF in relation to flat and intradiverticular papillae.

METHODS

This prospective multicenter study enrolled consecutive patients, evidencing naïve flat (group A, n = 49) or diverticular papilla (group B, n = 28), who underwent NKF after failure of standard cannulation techniques. Diverticular morphology was subdivided into intradiverticular (group B1, n = 14) and diverticular border papillae (group B2, n = 14), using a previously validated endoscopic classification of the major papilla. The success of biliary cannulation at initial endoscopic retrograde cholangiopancreatography (ERCP), overall biliary cannulation, overall cannulation time, and the rate of adverse events were assessed in the study.

RESULTS

The initial cannulation rates were 93.9%, 64.3% and 71.4% for group A, B1, and B2, respectively (P = 0.005); overall cannulation rates after a second ERCP were 98.0%, 92.9% and 85.7%, respectively (P = 0.134). Adverse events occurred in 11.7% of patients, with post-ERCP pancreatitis (PEP) being the most common adverse event (10.4%). Although there was a trend towards a higher incidence of PEP in flat papillae, univariate and multivariate analyses did not show any significant relationship between pancreatitis and trainee involvement, papillary morphology, nor overall cannulation time.

CONCLUSIONS

Although flat papillae are associated with high success rates of biliary cannulation using NKF, the rate of PEP is not negligible. NKF is feasible in diverticular papillae, but it is associated with a modest success rate in the initial ERCP.

Safety and efficacy of different techniques in difficult biliary cannulation at endoscopic retrograde cholangiopancreatography

BACKGROUND

Adverse events (AEs) are commonly seen at endoscopic retrograde cholangiopancreatography (ERCP) during difficult biliary cannulation (DBC). Therefore, attaining the right technique is essential to have improved outcomes.

METHODS

Patients who had DBC over a 3-year period were assessed for outcomes. The protocol included double guidewire (DGW) technique, wire-guided cannulation (WGC) after pancreatic stent, precut sphincterotomy/fistulotomy, and EUS-guided rendezvous (RV). The success of various techniques and AE was studied.

RESULTS

As per available case analysis, a total of 3680 patient details were assessed out of which DBC was noted in 471 (12.8%) patients with a mean (SD) age of 51.5 (17.4) years; majority being 330 (70.1%) males. Most patients underwent precut sphincterotomy 230 (48.8%); however, it was not successful in the first attempt in 10 (2.1%) patients with the success rate of 220 (95.6%). The success rate of DGW cannulation was 120 (95.2%), WGC after pancreatic stent was 64 (94.1%), EUS-RV was 34 (97.1%), and wire-guided repeat ERCP after 48 h was 10 (98.3%). AEs were noted in 52 (11.1%) patients. After precut, 32 (13.9%) patients developed AE out of which post-ERCP pancreatitis was noted in 20 (8.7%). Twenty-three patients had failed biliary access after all methods and 20 (86.9%) of those received successful percutaneous transhepatic biliary drainage.

CONCLUSION

Repeat ERCP after 48 h and EUS-RV appear prudent for DBC. Precut remains one of the preferred choices for most endoscopists when there is no entrance to PD. Further utilizing an algorithmic approach can contribute to higher success rates without compromising safety.

DIFFICULT BILIARY CANNULATION: SHOULD WE ALWAYS TRY A SECOND ERCP AFTER A FAILED NEEDLE-KNIFE FISTULOTOMY?

BACKGROUND

A successful bile duct cannulation is a prerequisite for the realization of endoscopic retrograde cholangiopancreatography (ERCP). When biliary cannulation is not possible, needle-knife fistulotomy (NKF) can be performed. However, when biliary access is not successfully achieved even after performing NKF, it is possible to interrupt the procedure, and repeat the ERCP after a short interval.

OBJECTIVE

The aim of this study is to analyze if repeating an ERCP after a short interval of 48 hours is effective in achieving biliary access after an initial NKF was unsuccessfully performed.

METHODS

A total of 1024 patients with a naive papilla, that underwent ERCP between the years of 2009-2019, were retrospectively reviewed. Difficult biliary cannulation was identified in 238 of these cases and NKF was performed. Success of biliary cannulation, NKF success at the first and second ERCPs, the associations between the type of the papilla, biliary dilatation, and overall success of NKF and adverse events rates were evaluated.

RESULTS

Biliary access was initially achieved in 183 (76.8%) cases. Of the 55 (23.1%) remaining cases a second attempt was performed after 48 hours, and biliary access was successfully achieved in 46 (83.6%) of them. The overall success of NKF after the first and second ERCP, the success rate was 96.2%. Papilla located out of its normal position was related to a minor chance of success at NKF (P<0.05).

CONCLUSION

We conclude that when biliary access is not achieved after the performance of a NKF, a second attempt is safe and effective and should be attempted.

Efficacy and safety of primary needle-knife fistulotomy in biliary cannulation: a systematic review and meta-analysis

We aimed to conduct a systematic review and meta-analysis on the efficacy and safety of primary needle-knife fistulotomy (NFK) in biliary cannulation. An electronic bibliographic search of digital dissertation databases was performed from inception till March 2020. All prospective studies, including randomized trials evaluating the use of NFK as a primary cannulation technique in biliary cannulation, were analyzed. The primary outcome was a successful cannulation rate and the secondary outcomes were post-ERCP pancreatitis rate and overall post-ERCP complication rate. A total of four prospective studies, including three randomized trials, were included for the analysis. The pooled cannulation success rate for primary NFK was 95.7% (95% CI. 83.1-99.0, P < 0.001). When compared with standard wire-guided cannulation, the analysis did not show any difference between the two techniques in terms of cannulation success (OR, 3.59, 95% CI, 0.34-37.39; P = 0.28; low certainty of evidence). The overall rate of post-ERCP pancreatitis with primary NFK was 1.5 % (95% CI, 0.6-3.9, P < 0.001). When compared with conventional wire-guided technique, the odds of developing post-ERCP pancreatitis with NFK were 0.22 (95% CI, 0.04-1.04, P = 0.06; moderate certainty of evidence). To conclude, NKF seems to be an effective means of biliary cannulation in expert hands. Although it may be associated with a lower rate of post-ERCP pancreatitis, the current strength and quality of evidence to support its use as a primary cannulation strategy is low. It may be considered in ERCPs at higher risk of pancreatitis by experienced endoscopists.

Outcomes of single-endoscopist-performed needle-knife fistulotomy for selective biliary access in 842 consecutive patients: learning curve and changes over a 14-year period in a retrospective study

BACKGROUND AND AIMS

Needle-knife fistulotomy (NKF) has emerged as the preferred precut technique. From a late strategy, NKF has shifted to an early rescue technique and has been used recently as a primary method for biliary access. It is unknown how these changes have affected NKF outcomes. We analyzed the outcomes of NKF over time in a large cohort of patients.

METHODS

Multicenter retrospective cohort study of 842 patients who underwent NKF for biliary access between 2006 and 2019. Patients were divided into four study periods according to a late or early cannulation strategy and to the use of post-ERCP pancreatitis prophylaxis (Period 1-Period 4). We assessed outcomes of NKF, learning curves and shifts over time.

RESULTS

Bile duct access was obtained in 88.0% of the patients. The initial cannulation rate increased significantly from 77.5% in P1 to 92.0% in P4 (p < .001). An endoscopist can obtain 80% success rate after performing 100 NKF procedures (95% CI: 0.79-0.86) and a 95% success rate after 830 procedures (95% CI: 0.92-0.98). Adverse events and pancreatitis were observed in 6.5% and 4.9% of patients respectively. The rate of pancreatitis was not significantly different during the 4 periods (p = .190). A decline in the pancreatitis rate was observed from 2006 until 2016 (no trainees) and then an increase until 2019 (trainees involved). The presence of trainees increased the rate of pancreatitis in the last period by 9.9%.

CONCLUSIONS

The success of NKF has increased significantly over the years, initially in a rapid manner and then more slowly. It is associated with a low rate of complications, which tend to decrease with experience. The involvement of trainees is associated with an increased rate of pancreatitis.

Troubleshooting Difficult Bile Duct Access: Advanced ERCP Cannulation Techniques, Percutaneous Biliary Drainage, or EUS-Guided Rendezvous Technique?

Despite experienced hands and availability of various well-designed catheters and wires, selective bile duct cannulation may still fail in 10–20% of cases during endoscopic retrograde cholangiopancreatography (ERCP). In case standard ERCP cannulation technique fails, salvage options include advanced ERCP cannulation techniques such as double-guidewire technique (DGW) with or without pancreatic stenting and precut papillotomy, percutaneous biliary drainage (PBD), and endoscopic ultrasound-guided Rendezvous (EUS-RV) ERCP. If the pancreatic duct is inadvertently entered during cannulation attempts, DGW technique is a reasonable next step, which can be followed by pancreatic stenting to reduce risks of post-ERCP pancreatitis (PEP). Studies suggest that early precut papillotomy is not associated with a higher risk of PEP, while needle-knife fistulotomy is the preferred method. For patients with critical clinical condition who may not be fit for endoscopy, surgically altered anatomy in which endoscopic biliary drainage is not feasible, and non-communicating multisegmental biliary obstruction, PBD has a unique role to provide successful biliary drainage efficiently in this particular population. As endoscopic ultrasound (EUS)-guided biliary drainage techniques advance, EUS-RV ERCP has been increasingly employed to guide bile duct access and cannulation with satisfactory clinical outcomes and is especially valuable for benign pathology at centres where expertise is available. Endoscopists should become familiar with each technique’s advantages and limitations before deciding the most appropriate treatment that is tailored to patient’s anatomy and clinical needs.

Controversies in ERCP: Technical aspects

The aim of the series of papers on controversies of biliopancreatic drainage procedures is to discuss pros and cons of the varying clinical practices and techniques in ERCP and EUS for drainage of biliary and pancreatic ducts. While the first part focuses on indications, clinical and imaging prerequisites prior to ERCP, sedation options, post-ERCP pancreatitis prophylaxis, and other related technical topics, the second part discusses specific procedural ERCP techniques including precut techniques and their timing as well as management algorithms. In addition, reviews on controversies in EUS-guided bile duct and pancreatic drainage procedures are under preparation.

Efficacy and safety of primary, early and late needle-knife fistulotomy for biliary access

European Society of Gastrointestinal Endoscopy recommends needle-knife fistulotomy (NKF) as the preferred precut technique. However, there is little information on whether NKF performed at different times is associated with different success and adverse event rates. We compared the outcomes of 3 different timings of NKF. This was an observational study conducted at 4 institutions and this was a retrospective analysis of prospectively collected data. We included 330 consecutive patients submitted to NKF attempt for biliary access. Patients were divided into three groups: NKF as an initial procedure for biliary access (group A, n = 121); early NKF defined as after 5 min, 5 attempts, or 2 pancreatic passages (group B, n = 99); and late NKF: after at least 10 min of unsuccessful standard biliary cannulation (group C, n = 110). We assessed the success rate of biliary cannulation at initial ERCP, time to perform NKF until biliary cannulation, overall biliary cannulation rate (second ERCP when initial failure), adverse event rate, and predictors of post-ERCP pancreatitis (PEP). The initial cannulation rate was 98%, 91% and 94% for groups A, B and C respectively, p = 0.08, whereas overall biliary cannulation rate was 100%, 95% and 98%, p = 0.115. The adverse event rate/PEP was 4.1%/2.5%, 7.1%/4% and 10.9%/8.2%, for groups A, B and C respectively, (p = 0.197 and p = 0.190). Median time for creating the fistula was A = 4.0 min, B = 3.2 min, and C = 5.6 min, p < 000.1. Each additional minute spent attempting cannulation increased the odds ratio (OR) for PEP by 1.072, and patients with 3 or more risk factors for pancreatitis had a higher chance of PEP. In conclusion, the timing of NFK does not appear to influence success rates but late NFK is associated with a higher time to create a fistula and an increased risk of pancreatitis. Primary NFK is associated with a high rate of success and a low rate of PEP and deserves additional investigation.

Snare-assisted precutting and dual-knife fistulotomy performed during difficult biliary cannulation in a patient with an ectopic papilla of Vater

Endoscopic retrograde cholangiopancreatography is widely used in the diagnosis and treatment of pancreatobiliary diseases; however, successful biliary cannulation is a prerequisite for this operation. We herein present a new method in a patient in whom cannulation was difficult. A 56-year-old man was admitted to the hospital with choledocholithiasis. Endoscopic retrograde cholangiopancreatography was performed, and duodenoscopy revealed that the patient’s duodenal papilla was located at the initial part of the horizontal segment of the duodenum. Because of the ectopic location of the duodenal papilla, the guidewire could not be inserted into the biliary and pancreatic duct. Therefore, we performed a new method to resolve the problem of difficult cannulation. A polypectomy snare was used to excise the mucosa covering the surface of the intramural segment of the common bile duct, and a dual knife was used to form a fistula. A guidewire was then inserted through the stoma into the bile duct. After the procedure, the bile duct was successfully cannulated and the stones were removed. No complications occurred. This new method may be an alternative treatment to precutting for difficult biliary cannulation in patients with a protruded papilla of Vater.

Influence of a novel classification of the papilla of Vater on the outcome of needle-knife fistulotomy for biliary cannulation

Background

Existing proposed classification systems for the Papilla of Vater (PV) suboptimally account for all relevant, encountered PV appearances, are too complex or have not been assessed for intra- or interobserver variability. We proposed a novel endoscopic classification system for PV, determined its inter- and intraobserver rates and used the classification system to assess whether the success and complications of needle-knife fistulotomy (NKF) are influenced by the morphology of the PV.

Methods

The classification system was developed by expert endoscopists. To evaluate the inter- and intraobserver agreement, an online questionnaire was sent to 20 endoscopists from several countries (10 experts and 10 nonexperts) that included 50 images of papillae of Vater divided among various categories. Four weeks later, a second survey, with the images from the first questionnaire randomly reordered, was sent to the same endoscopists. The inter- and intraobserver agreements among the experts and nonexperts was calculated. Using the proposed classification system, all 361 consecutive patients who underwent NKF for biliary access to a naïve papilla were prospectively enrolled in the study.

Results

The novel classification system comprises 7 categories: type I, flat type, lacking an oral protrusion; type IIA, prominent tubular nonpleated type, with an oral protrusion and < 1 transverse fold over the oral protrusion; type IIB, prominent tubular pleated type, with an oral protrusion and > 2 transverse folds over the oral protrusion; type IIC: prominent bulging type, with an enlarged and bulging oral protrusion; type IIIA, diverticular-intradiverticular type, with a papillary orifice inside the diverticulum; type IIIB: diverticular-diverticular border type, with a papillary orifice less than 2 cm from the diverticular border; type IV: unclassified papilla, with no morphology classified in the other categories. The interobserver agreement between experts was substantial (K = 0.611, 95% CI 0.498–0.709) and was higher than that between nonexperts (K = 0.516; 95% CI 0.410–0.636). The intraobserver agreement was substantial among both experts (K = 0,651; 95% CI 0.586–0.715) and nonexperts (K = 0.646, 95% CI 0.615–0.677). In a multivariate model, type IIIA and IIIB were the only independent risk factors for difficult rescue NKF biliary cannulation (P = 0.003 and P = 0.019, respectively), and type I and type IIB were the only independent risk factors for a prolonged cannulation time using NKF (P < 0.001 and P = 0.005, respectively).

Conclusions

The novel endoscopic classification system for PV is highly reproducible among experienced ERCPists according to the substantial level of agreement between experts. However, nonexperts require further training in its use. Using the novel classification system, we identified different types of papillae significantly associated with a lower efficacy of NKF and a prolonged time to obtain successful biliary cannulation using NKF.

Access fistulotomy: technical tips for success

Background and Aims

Biliary cannulation, although critical to procedural success in ERCP, can be difficult and, if unsuccessful, can lead to longer hospital stays, repeat procedures, and increased costs. Expertise in adjunct techniques, including access fistulotomy, can increase success rates and potentially avoid these issues. The aim of this case series is to describe the technique of access fistulotomy and illustrate key points that are important for successful biliary access.

Methods

Three cases are reviewed in which access fistulotomy was used to achieve biliary access. The steps for the procedure are reviewed, and key technical tips and anatomic landmarks are illustrated in the video.

Results

Successful biliary access is obtained using fistulotomy in 3 cases. In each case, the anatomic landmarks of the papilla and intraduodenal biliary segment are reviewed. The first case illustrates a large papilla in which initial incision followed by careful exposure reveals a clear “onion ring” structure corresponding to the bile duct. The second case requires stepwise incision, each guided by anatomic landmarks before the biliary adventitia is identified, leading to biliary cannulation. In the third case, the utility of fistulotomy in a duodenal diverticulum is illustrated. Recognition of the distorted anatomy allowed precise, careful incision leading to biliary access.

Conclusions

Access fistulotomy is an invaluable technique to aid in biliary access. Knowledge of key landmarks and careful evaluation of the incision are critical to successful biliary access when performing fistulotomy.

Advances in Biliary Access

PURPOSE OF REVIEW

Bile duct cannulation using conventional techniques fails in up to 16% of endoscopic retrograde cholangiopancreatography (ERCP) procedures. Advanced techniques to gain biliary access include ERCP-based maneuvers, and newer endoscopic ultrasound (EUS)-guided interventions. In this article, we review the evidence supporting the use of various ERCP and EUS techniques for biliary access, as well as studies comparing these different techniques.

RECENT FINDINGS

In comparative studies, biliary access after failed conventional cannulation was more successful with EUS-rendezvous compared to precut papillotomy. EUS-guided drainage compares favorably with percutaneous drainage with respect to clinical success, safety profile, and cost-efficiency. Recent randomized trials comparing EUS to ERCP drainage in malignant obstruction have found similar success rates between these techniques. EUS-guided techniques compare favorably to ERCP-based methods for biliary access and drainage. The advent of newer technologies to facilitate interventional EUS may further change current treatment approaches.

Comparison between transpancreatic sphincterotomy and needle-knife fistulotomy in difficulty biliary access, a retrospective study in Taiwan

Background

Selective deep biliary cannulation is the first and the most important step before further biliary therapy. Transpancreatic sphincterotomy (TPS), and needle knife fistulotomy (NKF) were commonly used in patients with difficult cannulation, but few studies compare the outcome between TPS and NKF.

Methods

A total of 78 patients who met the criteria of difficult cannulation in the National Taiwan University hospital from October 2015 to October 2017 were retrospectively reviewed. Their baseline demographics, success rate of biliary cannulation, and the rate of adverse events were assessed.

Results

31 patients and 47 patients underwent TPS and NKF for difficult biliary access, respectively. The characteristics of the 2 groups were similar, but patients in TPS group had more frequent pancreatic duct cannulation. Bile duct cannulation was successful in 23 patients (74.2%) in the TPS group and 39 (83.0%) in the NKF group (P = 0.34). There was no difference between the TPS and NKF in the rate of adverse events, including post-ERCP pancreatitis (PEP) (16.1% vs. 6.4%, p = 0.17), and hemorrhage (3.2% vs. 8.5%, p = 0.35). No perforation occurred.

Conclusions

Both TPS and NKF have good biliary access rate in patient with difficult cannulation. TPS has acceptable successful rate and similar complication rate, compared with NKF.

Primary Needle-Knife Fistulotomy Versus Conventional Cannulation Method in a High-Risk Cohort of Post-Endoscopic Retrograde Cholangiopancreatography Pancreatitis

OBJECTIVES

Successful biliary cannulation is a prerequisite and important component of endoscopic retrograde cholangiopancreatography, but conventional cannulation methods (CCMs) have a postendoscopic retrograde cholangiopancreatography pancreatitis (PEP) rate of 14.1% in patients at high risk for PEP. The aim of this study was to evaluate the effectiveness and safety of needle-knife fistulotomy (NKF), compared with a CCM, when used for primary biliary access in patients at high risk for developing PEP.

METHODS

A total of 207 patients with one or more risk factors for PEP were prospectively enrolled. The patients were randomly allocated to one of 2 groups according to the primary biliary cannulation technique (NKF or CCM). We compared biliary cannulation success rates, cannulation and procedure times, and the incidence of adverse events, including PEP, between the groups.

RESULTS

The mean number of PEP risk factors was similar between the groups (NKF, 2.2 ± 1.0; CCM, 2.2 ± 0.9). PEP occurred in 8 patients in the CCM group and in no patients in the NKF group (9.2% vs 0%, P < 0.001). The rates of other adverse events did not differ between the groups. The biliary cannulation success rate was high in the NKF group, but relatively low in the CCM group, possibly because of the stringent failure criteria aimed at reducing PEP. However, the mean cannulation and total procedural times were longer in the NKF group than in the CCM group.

DISCUSSION

NKF is an effective and safe procedure to gain primary biliary access in patients at high risk for developing PEP. ClinicalTrials.gov, NCT02916199.

Needle-knife fistulotomy vs. standard biliary sphincterotomy for choledocholithiasis: common bile duct stone recurrence and complication rate

Background and study aims  With common bile duct (CBD) stones, access to the CBD can be achieved through the papilla orifice followed by standard biliary sphincterotomy (SBS), or through precut fistulotomy (PF) in case of difficult cannulation. The two methods alter papilla anatomy differently, potentially leading to a different rate of stone recurrence. No data have been published on stone recurrence after PF in patients with CBD stones. The aim of this study was to evaluate CBD stone recurrence, reintervention rate after PF versus SBS, and complications. Patients and methods  This was a retrospective single-center cohort study including patients undergoing for the first time endoscopic retrograde cholangiopancreatography (ERCP) for CBD stones with PF in case of failed repeated cannulation attempts, matched for sex/age to patients with SBS randomly extracted from our database. T -test and Fisher's tests were used for continuous and categorical variable comparison. Recurrence probability was calculated with Kaplan-Meier curve. Factors associated with ERCP repetition were evaluated with logistic regression through a Cox's proportional hazards model. Results  Eighty-five patients with PF were included, with 85 matched controls (mean age 68.7 years, 45.9 % males). Overall, patients with PF had the same reintervention rate as those with SBS (14.1 % vs. 12.9 %) with a hazard ratio (HR) of 1.11 (95 % CI 0.49 - 2.50; P  = 0.81), but mean time to reintervention was significantly lower (74.9 ± 74.6 vs. 765.6 ± 961.3 days; P  < 0.0001), with 100 % of stones recurring within the first year in the PF group vs. 54.5 % in the SBS group ( P  = 0.01). The only factor associated with ERCP repetition risk was incomplete CBD clearing. Complications, including pancreatitis, did not differ significantly. Conclusions  The reintervention rate was significantly higher in the short term after PF. Therefore, closer follow-up in the first 6 to 12 months after ERCP might be appropriate for patients underoing PF.

Management of difficult or failed biliary access in initial ERCP: A review of current literature

Selective bile duct cannulation is the prerequisite for all endoscopic biliary therapeutic interventions, but this cannot always be achieved easily. Despite advances and new developments in endoscopic accessories, selective biliary access fails in 5%-15% of cases, even in expert high volume centers. Various techniques - such as double-guidewire induced cannulation, pre-cut papillotomy or transpancreatic sphincterotomy with or without placement of a pancreatic stent - have been used to improve cannulation success rates. Repeated and prolonged attempts at cannulation increase the risk of pancreatitis. Repeating the ERCP within a few days after initial failed pre-cut is a successful strategy and should be tried before contemplating more invasive, alternative interventions such as percutaneous-endoscopic or endoscopic ultrasound guided rendezvous procedure, percutaneous transhepatic or surgical intervention. However, standard guidelines or sequential protocol has not been existed up to now. In certain circumstances, there are unique clinical indications for which invasive, alternative interventions should be preferred. We present and discuss the methods that can be used in difficult or failed initial ERCP, therefore to provide practical advice for endoscopists, especially those who are inexperienced.

Comparison of efficacy and safety of transpancreatic septotomy, needle-knife fistulotomy or both based on biliary cannulation unintentional pancreatic access and papillary morphology

BACKGROUND

Precut sphincterotomy has been widely performed to facilitate selective biliary access when standard cannulation attempts failed during endoscopic retrograde cholangiopancreatography (ERCP). However, scarce data are available on different precut techniques for difficult biliary cannulation. This study aimed to evaluate the efficacy and safety of transpancreatic septotomy (TPS), needle-knife fistulotomy (NKF) or both based on the presence of unintentional pancreatic access and papillary morphology.

METHODS

Between March 2008 and December 2016, 157 consecutive patients undergoing precutting for an inaccessible bile duct during ERCP were identified. Precut techniques were chosen depending on repetitive inadvertent pancreatic cannulation and the papillary morphology. We retrospectively assessed the rates of cannulation success and procedure-related complications among three groups, namely TPS, NKF, and TPS followed by NKF.

RESULTS

The baseline characteristics of the three groups were comparable. The overall success rate of biliary cannulation reached 98.1%, including 111 of 113 (98.2%) with TPS, 35 of 36 (97.2%) with NKF and 8 of 8 (100%) with NKF following TPS, without significant difference among groups. The incidences of total complications and post-ERCP pancreatitis were 9.6% and 7.6%, respectively. There was a trend towards less frequent post-ERCP pancreatitis after NKF (0%) compared with 11 cases (9.7%) after TPS and one case (12.5%) after NKF following TPS, but not significantly different (P = 0.07). No severe adverse event occurred during this study period.

CONCLUSIONS

The choice of precut techniques by the presence of unintended pancreatic access and the papillary morphology brought about a high success rate without increasing risk in difficult biliary cannulation.

EUS-guided drainage: Summary of therapeutic EUS consortium meeting

EUS-guided drainage is a safe and efficacious endoscopic technique for biliary, pancreatic, and gallbladder decompression. Recent literature has described many successful procedural techniques and devices to achieve EUS-guided drainage. This consortium gathering advanced endoscopists with expertise in both ultrasonography and therapeutic endoscopy, discuss the introduction to learning several EUS-guided drainage approaches, devices, and technology involved, possible obstacles to certain procedural and all potential complications.

Early precut sphincterotomy does not increase the risk of adverse events for patients with difficult biliary access: A systematic review of randomized clinical trials with meta-analysis and trial sequential analysis

OBJECTIVE

The present study was conducted to investigate whether early precut sphincterotomy (EPS) itself increases the incidence of post-endoscopic retrograde cholangiopancreatography pancreatitis (PEP), bleeding, and perforation, or improves the overall success rates of biliary cannulation.

METHODS

Four electronical databases were searched systematically for randomized controlled trials (RCTs) reporting the incidence of adverse events for difficult biliary access (DBA) between EPS groups and persistent cannulation attempts (PCA). The primary endpoint was the incidence of PEP. Secondary outcomes were the incidence of bleeding and perforation, and the overall success rates of biliary cannulation. The Mantel-Haenszel method was used to pool data on the outcomes into random-effect models. Heterogeneity, sensitivity, and stratified analyses were performed with Review Manager 5.3. Furthermore, we performed trial sequential analysis (TSA) to evaluate the reliability of the primary endpoint and secondary outcomes.

RESULTS

Seven RCTs (999 patients with DBA of 10450, 9.5%) were included. The incidence of PEP was significantly lower in EPS groups than PCA (risk ratio [RR] = 0.57, 95% confidence interval [CI] 0.36, 0.92, P = .02). Furthermore, TSA (TSA-adjusted 95% CI 0.30-0.82, P = .0061) and subgroup analysis stratified by the fellow involvement in initial cannulation before randomization, technique of precut, and the definition of DBA confirmed this finding. Success rates of overall cannulation (RR = 1.00, P = .94), bleeding (RR = 1.22, P = .58), and perforation (RR = 1.59, P = .32) were similar in both groups; however, the results of TSA could not confirm these findings.

CONCLUSION

Both the quality and the quantity of evidence supporting, compared with PCA, EPS itself do not increase the risk of PEP for DBA patients. Moreover, subgroup analysis demonstrated that EPS can significantly decrease the risk of PEP when it is performed by qualified staff endoscopists with using needle-knife fistulutomy earlier for patients with DBA.

Optimal timing for precutting in cases with difficult biliary cannulation

BACKGROUND AND STUDY AIMS

 In endoscopic retrograde cholangiopancreatography (ERCP), precutting is widely used when achieving biliary cannulation is difficult. However, no consensus has been reached with regard to the best time to initiate precutting.

PATIENTS AND METHODS

 We retrospectively examined 63 patients who underwent precutting for naïve papilla with difficulty in biliary cannulation between 2009 and 2016. The outcomes of the early precut group (≤ 20 min from cannulation until initiating precutting) and the late precut group (> 20 min) were compared.

RESULTS

 Of the 63 patients, 17 (27 %) were in the early precut group and 46 (73 %) were in the late precut group; median time until the initiating precutting was 28 minutes (7 - 50). No significant difference was observed between the two groups in terms of clinical features (age, sex, and indication for ERCP), precutting method, and rate of pancreatic duct stent placement. Significantly higher rates of successful biliary cannulation were observed in the early precut group (16/17; 94 %) than in the late precut group (32/46; 70 %) ( P  < 0.05). In 13 patients in whom precutting was commenced after 40 minutes, the rate of successful biliary cannulation was very low at 53 % (7/13). No significant difference was found between the two groups in terms of incidence of complications (pancreatitis in 5 patients and bleeding in 1 patient).

CONCLUSION

 In actual clinical practice, precutting is commenced approximately 30 minutes after cannulation; however, to successfully achieve biliary cannulation, precutting is recommended to be performed within 20 minutes. Precutting is effective when little inflammation and swelling of the ampulla of Vater is observed. This study was limited in that it was single-center, retrospective and had a small subject sample.

Stent placement by EUS or ERCP for primary biliary decompression in pancreatic cancer: a randomized trial (with videos)

BACKGROUND AND AIMS

Studies on EUS-guided transmural biliary drainage (EUS-BD) have evaluated its efficacy as a rescue technique after failed ERCP. We performed a single-center, single-blind, randomized trial to compare EUS-BD and ERCP as primary treatment for distal biliary obstruction in pancreatic cancer.

METHODS

Patients underwent EUS-BD (n = 33) or ERCP (n = 34). The primary endpoint was the rate of adverse events. Secondary endpoints were technical success, treatment success (defined as decline in serum bilirubin by 50% at a 2-week follow-up), reinterventions, and intraoperative technical outcome, when applicable. Follow-up was until death or a minimum of 6 months.

RESULTS

The rates of adverse events were 21.2% (6.1% moderate severity; others mild severity) in the EUS-BD group and 14.7% (5.9% moderate severity; others mild severity) in the ERCP group (risk ratio, .69; 95% confidence interval, .24-1.97; P = .49). There were no procedure-related deaths. There was no significant difference in the rates of technical success (90.9% vs 94.1%, P = .67), treatment success (97% vs 91.2%, P = .61), or reinterventions (3.0% vs 2.9%, P = .99) between EUS-BD and ERCP cohorts, respectively. The endoscopic interventions did not impede subsequent pancreaticoduodenectomy that was performed in 5 of 33 patients (15.2%) in the EUS-BD and 5 of 34 patients (14.7%) in the ERCP group (P = .99).

CONCLUSIONS

Given the similar rates of adverse events and treatment outcomes in this randomized trial, EUS-BD is a practical alternative to ERCP for primary biliary decompression in pancreatic cancer. (Clinical trial registration number: NCT03054987.).

Papillary fistulotomy vs conventional cannulation for endoscopic biliary access: A prospective randomized trial

AIM

To compare the cannulation success, biochemical profile, and complications of the papillary fistulotomy technique vs catheter and guidewire standard access.

METHODS

From July 2010 to May 2017, patients were prospectively randomized into two groups: Cannulation with a catheter and guidewire (Group I) and papillary fistulotomy (Group II). Amylase, lipase and C-reactive protein at T0, as well as 12 h and 24 h after endoscopic retrograde cholangiopancreatography, and complications (pancreatitis, bleeding, perforation) were recorded.

RESULTS

We included 102 patients (66 females and 36 males, mean age 59.11 ± 18.7 years). Group I and Group II had 51 patients each. The successful cannulation rates were 76.5% and 100%, respectively (P = 0.0002). Twelve patients (23.5%) in Group I had a difficult cannulation and underwent fistulotomy, which led to successful secondary biliary access (Failure Group). The complication rate was 13.7% (2 perforations and 5 mild pancreatitis) vs 2.0% (1 patient with perforation and pancreatitis) in Groups I and II, respectively (P = 0.0597).

CONCLUSION

Papillary fistulotomy was more effective than guidewire cannulation, and it was associated with a lower profile of amylase and lipase. Complications were similar in both groups.

Biliary cannulation effectiveness and pancreatitis risk using two early precut techniques

INTRODUCTION

Precut techniques allow for successful biliary cannulation rates approaching 100% but there may be an associated increase in the risk of complications. Recently, early needle-knife precut has been shown to be a safe procedure and is now used as a pancreatitis prevention resource for difficult cannulation cases. The goal of the present study was to assess cannulation and pancreatitis rates using two early precut techniques.

PATIENTS AND METHODS

This was a retrospective study of endoscopic retrograde cholangio-pancreatography (ERCP) procedures performed from 2013 to 2016. The efficacy and safety of simple cannulation, needle-knife precut and transpancreatic precut were assessed.

RESULTS

Simple cannulation was achieved in 369 (73.4%) of 503 evaluable ERCP procedures. Needle-knife precut was successful in 51 (96.2%) of 53 attempts and transpancreatic precut was successful in 75 (96.2%) of 78 attempts. The overall cannulation rate was 98.4%. There were eleven (2.4%) pancreatitis events, six (1.8%) with simple cannulation (two severe, one fatal), five (6.3%) with transpancreatic precut (two severe) and zero events with the needle-knife precut procedure. Among the patients undergoing the precut procedure, seven experienced perforations (two severe) and there were seven bleeding events. The overall complication rate was 14.4%.

CONCLUSIONS

The complementary use of either precut technique provides a satisfactory biliary cannulation rate. However, the rates of pancreatitis and other severe complications are higher for transpancreatic versus needle-knife precut, therefore the indications for both techniques should be modified.

Advances of recurrent risk factors and management of choledocholithiasis

Gallstone disease is a common and frequently occurring disease in human, and it is the main disease among the digestive system diseases. The incidence of gallstone disease in western countries is about 5%-22%, and common bile duct stones (CBDS) accounts for 8%-20%. CBDS easily lead to biliary obstruction, secondary cholangitis, pancreatitis, and obstructive jaundice, even endanger life. Therefore, it needs timely treatment once diagnosed. The recurrence of choledocholithiasis after bile duct stones clearance involves complicated factors and cannot be completely elaborated by a single factor. The risk factors for recurrence of choledocholithiasis include bacteria, biliary structure, endoscopic and surgical treatment, and inflammation. The modalities for management of choledocholithiasis are endoscopic retrograde cholangiopancreatography (ERCP), laparoscopic or open common bile duct exploration, dissolving solutions, extracorporeal shockwave lithotripsy (ESWL), percutaneous radiological interventions, electrohydraulic lithotripsy (EHL) and laser lithotripsy. We compare the different benefits between surgery and ERCP. And finally, we make a summary of the current strategy for reducing the recurrence of CBDS and future perspectives for CBDS management.

Utility of needle-knife fistulotomy as an initial method of biliary cannulation to prevent post-ERCP pancreatitis in a highly selected at-risk group: a single-arm prospective feasibility study

BACKGROUND/AIMS

The aim of this study was to assess the feasibility of needle-knife fistulotomy (NKF) as an initial procedure for biliary access in patients with stones in the common bile duct (CBD) who were at increased risk for post-ERCP pancreatitis (PEP).

METHOD

Fifty-five patients who underwent ERCP with NKF for CBD stones at our institution between July 2013, and May 2015, were prospectively enrolled in this study. They had one or more of the following risk factors for PEP: young age (<60 years), female sex, or normal CBD diameter (≤9 mm). The procedure was performed by an expert biliary endoscopist (S.J.). The success rate of biliary cannulation and CBD stone removal, and the incidence rate of adverse events were assessed.

RESULTS

Seventeen patients had 1 risk factor for PEP, 27 had 2, and 11 had 3. The median procedure times for NKF and CBD stone removal after NKF were 2.1 minutes (range, 0.2-8.7 min) and 6.5 minutes (range, 1.1-28.3 min), respectively. Success rates of CBD cannulation and stone removal using NKF were 96.3% (53/55) and 92.7% (51/55), respectively. None of the patients experienced PEP. Retroperitoneal duodenal perforation occurred in 1 patient (1.8%), but it was successfully treated by conservative management.

CONCLUSION

NKF might be feasible as an initial procedure for biliary access in patients with CBD stones who are at high risk for PEP if the procedure is performed by an expert biliary endoscopist. (Clinical trial registration number: KCT0001698.).

Optimal Use of Wire-Assisted Techniques and Precut Sphincterotomy

Various endoscopic techniques have been developed to overcome the difficulties in biliary or pancreatic access during endoscopic retrograde cholangiopancreatography, according to the preference of the endoscopist or the aim of the procedures. In terms of endoscopic methods, guidewire-assisted cannulation is a commonly used and well-known initial cannulation technique, or an alternative in cases of difficult cannulation. In addition, precut sphincterotomy encompasses a range of available rescue techniques, including conventional precut, precut fistulotomy, transpancreatic septotomy, and precut after insertion of pancreatic stent or pancreatic duct guidewire-guided septal precut. We present a literature review of guidewire-assisted cannulation as a primary endoscopic method and the precut technique for the facilitation of selective biliary access.

Selective biliary cannulation techniques for endoscopic retrograde cholangiopancreatography procedures and prevention of post- endoscopic retrograde cholangiopancreatography pancreatitis

Numerous endoscopic retrograde cholangiopancreatography (ERCP) techniques have been reported to achieve selective biliary cannulation success. For standard biliary cannulation procedures, the wire-guided cannulation technique has been reported to reduce the rate of post-ERCP pancreatitis (PEP) and increase the biliary cannulation success rate, although conflicting reports exist. The pancreatic or double-guidewire technique and several precut techniques have been reported as useful techniques in difficult biliary cannulation cases. Although ERCP is a useful endoscopic procedure, the risk of adverse events, particularly post-ERCP pancreatitis, is inevitable. Previous studies and analyses have revealed the risk factors for PEP. The efficacy of prophylactic pancreatic duct stent placement and the administration of rectal nonsteroidal anti-inflammatory drugs for preventing PEP has also been reported. Herein, we reviewed reports in the literature regarding the current status of selective biliary cannulation techniques and PEP prevention.

Transpapillary selective bile duct cannulation technique: Review of Japanese randomized controlled trials since 2010 and an overview of clinical results in precut sphincterotomy since 2004

In 1970, a Japanese group reported the first use of endoscopic retrograde cholangiopancreatography (ERCP), which is now carried out worldwide. Selective bile duct cannulation is a mandatory technique for diagnostic and therapeutic ERCP. Development of the endoscope and other devices has contributed to the extended use of ERCP, which has become a basic procedure to diagnose and treat pancreaticobiliary diseases. Various techniques related to selective bile duct cannulation have been widely applied. Although the classical contrast medium injection cannulation technique remains valuable, use of wire-guided cannulation has expanded since the early 2000s, and the technique is now widely carried out in the USA and Europe. Endoscopists must pay particular attention to a patient's condition and make an attendant choice about the most effective technique for selective bile duct cannulation. Some techniques have the potential to shorten procedure time and reduce the incidence of adverse events, particularly post-ERCP pancreatitis. However, a great deal of experience is required and endoscopists must be skilled in a variety of techniques. Although the development of the transpapillary biliary cannulation approach is remarkable, it is important to note that, to date, there have been no reports of transpapillary cannulation preventing post-ERCP pancreatitis. In the present article, selective bile duct cannulation techniques in the context of recent Japanese randomized controlled trials and cases of precut sphincterotomy are reviewed and discussed.

Different Strategies for Transpancreatic Septotomy and Needle Knife Infundibulotomy Due to the Presence of Unintended Pancreatic Cannulation in Difficult Biliary Cannulation

Background/Aims

Several precut techniques have been used to gain biliary access for difficult cases. The aim of this study was to evaluate the success and complication rates of two precut techniques, transpancreatic septotomy (TPS) and needle knife infundibulotomy (NKI), in difficult biliary cannulation due to the presence of unintended pancreatic cannulation.

Methods

Eighty-six patients who failed standard biliary cannulation were included. TPS was performed when we failed to achieve biliary access despite 5 minutes of attempted cannulation or when more than three attempted unintended pancreatic cannulations occurred. If deep cannulation was not achieved within 5 minutes for any duct, NKI was performed. If this failed, we crossed over to the other technique in the second attempt.

Results

The initial total success rate of biliary cannulation was 88.4% (86.6% for the TPS group and 94.7% for the NKI group, p=0.447). After crossover of the techniques, the final success rate was 95.3%. The complication rate was 20.9% in patients with TPS and 15.8% in patients with NKI (p=0.753).

Conclusions

The use of different strategies based on the presence of unintended pancreatic cannulation may help increase the success rate for difficult biliary cannulation without increasing complication rates.

New technique of endoscopic sphincterotomy with iso-tome® to incise the distal papillary roof in patients with choledocholiths and choledochoduodenal fistula

BACKGROUND/AIMS

It is sometimes difficult to incise the dis-tal papillary roof (PR) completely in patients with choledocho-liths and choledochoduodenal fistula (CDF). The Iso-Tome® (MTW-Endoskopie W. Haag KG), which is helpful in prevent-ing electrical leakage, has good orientation capabilities and can be easily placed at the orifice of the CDF or ampulla of Vater (AV). We aimed to evaluate the efficacy of endoscopic sphincterotomy (ES) with the Iso-Tome® for cutting the distal PR.

METHODS

Between May 2003 and July 2012, 35 pa-tients were analyzed retrospectively. The distal PR was cut downward and/or upward using the Iso-tome® until the pink intrapapillary mucosa was fully exposed. Downward incisions were performed from the opening of the CDF to the orifice of the AV; upward incisions were performed in reverse.

RESULTS

Spontaneous or artificial CDF occurred in four and 31 pa-tients, respectively. The technical and therapeutic success rates were 94.3% (33/35) and 94.3% (33/35), respectively. There was no case of electrical damage to the pink intrapap-illary mucosa. Adverse events occurred in 2.9% (1/35; 1, mild bleeding) of patients.

CONCLUSIONS

The new technique of ES with the Iso-tome® is feasible and useful for effectively incising the distal PR in patients with CDF and choledocho-liths. (Gut Liver, 2015;9231-238).

Difficult Biliary Access: Advanced Cannulation and Sphincterotomy Technique

Many devices and techniques have been developed to assist in cases of difficult biliary cannulation. Guidewire-assisted cannulation has become the first-line technique for biliary cannulation. Precut sphincterotomy can be safe and effective if used soon after encountering difficulty. Pancreatic duct stents are an important adjunct to reduce the risk of post-endoscopic retrograde cholangiopancreatography pancreatitis in difficult access. Ultimately, cannulation success of greater than 95% and complication rates of less than 5% is the standard that endoscopists doing ERCP should achieve.

Early Precut Sphincterotomy Does Not Increase Risk During Endoscopic Retrograde Cholangiopancreatography in Patients With Difficult Biliary Access: A Meta-analysis of Randomized Controlled Trials

BACKGROUND & AIMS

Use of precut sphincterotomy during endoscopic retrograde cholangiopancreatography (ERCP) can increase the odds for cannulation success but is associated with increased risk of post-ERCP pancreatitis. Earlier, rather than delayed, use of precut sphincterotomy for cases with difficult biliary access might reduce this risk. We performed a meta-analysis of randomized controlled trials to determine how early use of precut sphincterotomy affects the risk of pancreatitis and rate of cannulation success compared with persistent standard cannulation.

METHODS

We searched MEDLINE, EMBASE, and the Cochrane central register of controlled trials, along with meeting abstracts, through August 2014 for randomized controlled trials in which early precut sphincterotomy was compared with persistent standard cannulation in adults with difficult biliary access. Outcomes considered included primary cannulation success, overall cannulation success, incidence of post-ERCP pancreatitis, and overall adverse event rate. Findings from a random-effects model were expressed as pooled risk ratios (RRs) with 95% confidence intervals (CIs).

RESULTS

We analyzed data from 5 studies (523 participants). The incidence of post-ERCP pancreatitis and success of overall cannulation did not differ significantly between the early precut and persistent standard therapy groups. Early use of precut sphincterotomy was associated with increased odds for primary cannulation success (RR, 1.32; 95% CI, 1.04-1.68). In subgroup analysis of studies that involved only fully qualified biliary endoscopists (not fellows), we found a significant reduction in risk of pancreatitis among patients receiving early precut vs the standard technique (RR, 0.29; 95% CI, 0.10-0.86).

CONCLUSION

Compared with standard therapy, early use of precut sphincterotomy did not increase the risk of post-ERCP pancreatitis in a meta-analysis. When the procedure is performed by qualified biliary endoscopists, early precut can reduce the risk of post-ERCP pancreatitis. Rates of primary cannulation increase with early precut. Further studies are needed to confirm these findings.

Needle-knife fistulotomy vs double-guidewire technique in patients with repetitive unintentional pancreatic cannulations

AIM: To compare the success rates and adverse events of early needle-knife fistulotomy (NKF) and double-guidewire technique (DGT) in patients with repetitive unintentional pancreatic cannulations.

METHODS: From a total of 1650 patients admitted for diagnostic or therapeutic endoscopic retrograde cholangiopancreatography (ERCP) at a single tertiary care hospital (Pusan National University Yangsan Hospital, Yangsan, South Korea) between January 2009 and December 2012, 134 (8.1%) patients with unsuccessful biliary cannulation after 5 min trial of conventional methods, together with 5 or more repetitive unintentional pancreatic cannulations, were enrolled in the study. Early NKF and DGT groups were assigned 67 patients each. In the DGT group, NKF was performed for an additional 7 min if successful cannulation was not achieved.

RESULTS: The success rates with early NKF and the DGT were 79.1% (53/67) and 44.8% (30/67) (P < 0.001), respectively. The incidence of post-ERCP pancreatitis (PEP) was lower in the early NKF group than in the DGT group [4.5% (3/67) vs 14.9% (10/67), P = 0.041]. The mean cannulation times in the early NKF and DGT groups after assignment were 257 s and 312 s (P = 0.013), respectively.

CONCLUSION: Our data suggest that early NKF should be considered as the first approach to selective biliary cannulation in patients with repetitive unintentional pancreatic cannulations.

Early 'shallow' needle-knife papillotomy and guidewire cannulation: an effective and safe approach to difficult papilla

INTRODUCTION

Needle-knife sphincterotomy (NKS), known as 'precut', is used worldwide to facilitate access to the common bile duct when standard cannulation has failed. This procedure is considered hazardous because it is burdened with high procedural related complications (bleeding and perforation). Its right timing is still debated. In this study we report our results using a modified precut approach, early shallow needle-knife papillotomy (eSNKP) coupled with guidewire cannulation in case of difficult papilla. We evaluated its safety and effectiveness.

METHODS

From 2012 to 2014, 1034 patients underwent therapeutic ERCP. A total of 138 of them presented difficult papilla and were treated with eSNKP performed after 5 failed attempts of standard guidewire cannulation. Deep biliary cannulation rate was recorded, as well as intraoperative and postoperative complication rate.

RESULTS

Successful biliary deep cannulation was achieved in 132/138 patients (95.7%) by means of eSNKP. In 6 patients (4.3%), cannulation failed even after eSNKP. ERCP was newly performed 72 hours later with successful and immediate guidewire biliary cannulation. Overall morbidity was 10.1% (14/138). No perforation occurred. Minor bleeding occurred in 4/138 cases (2.9%) and 10/138 patients (7.2%) developed mild pancreatitis.

CONCLUSION

In case of difficult papilla, eSNKP followed by guidewire cannulation increases the successful deep biliary cannulation with low rate of complications.

Endoscopic prevention of post-endoscopic retrograde cholangiopancreatography pancreatitis

Post-endoscopic retrograde cholangiopancreatography (ERCP) pancreatitis (PEP) is not an uncommon adverse event but may be an avoidable complication. Although pancreatitis of severe grade is reported in 0.1%-0.5% of ERCP patients, a serious clinical course may be lethal. For prevention of severe PEP, patient risk stratification, appropriate selection of patients using noninvasive diagnostic imaging methods such as magnetic resonance cholangiopancreatography or endoscopic ultrasonography (EUS), and avoidance of unnecessary invasive procedures, are important measures to be taken before any procedure. Pharmacological prevention is also commonly attempted but is usually ineffective. No ideal agent has not yet been found and the available data conflict. Currently, rectal non-steroidal anti-inflammatory drugs are used to prevent PEP in high-risk patients, but additional studies using larger numbers of subjects are necessary to confirm any prophylactic effect. In this review, we focus on endoscopic procedures seeking to prevent or decrease the severity of PEP. Among various cannulation methods, wire-guided cannulation, precut fistulotomy, and transpancreatic septostomy are reviewed. Prophylactic pancreatic stent placement, which is the best-known prophylactic method, is reviewed with reference to the ideal stent type, adequate duration of stent placement, and stent-related complications. Finally, we comment on other treatment alternatives, and make the point that further advances in EUS-guided techniques may afford useful PEP prophylaxis.

Factors significantly contributing to a failed conventional endoscopic stone clearance in patients with "difficult" choledecholithiasis: a single-center experience

The objective of this study is to retrospectively evaluate factors significantly contributing to a failed stone extraction (SE) in patients with difficult to extract bile duct stones (BDS). Patients and Methods. During a 10-year period 1390 patients with BDS underwent successfully endoscopic sphincterotomy. Endoscopic SE was graded as easy; relatively easy; difficult; and failed. Difficult SE was encountered in 221 patients while failed SE was encountered in 205. A retrospective analysis of the criteria governing the difficulty of endoscopic SE following the index endoscopic intervention was performed to evaluate their significance in determining failure of complete SE among patients with difficult to extract bile duct stones. Results. Age ≥ 85 years, periampullary diverticula, multiple CBD stones (>4), and diameter of CBD stones (≥15 mm) were all significant contributing factors to a failed SE in univariate statistical tests. In the definitive multivariate analysis age, multiple stones and diameter of stones were found to be the significant, independent contributors. Conclusion. Failed conventional endoscopic stone clearance in patients with difficult to extract BDS is more likely to occur in overage patients, in patients with multiple CBD stones >4, and in patients with CBD stone(s) diameter ≥15 mm.

One-step transfistula large versus conventional balloon dilation following precut fistulotomy in difficult biliary cannulation for the removal of biliary stones: a multicenter retrospective study

BACKGROUND AND AIM

After selective biliary access following precut fistulotomy in difficult biliary cannulations (DBC), there are several methods of completely opening the remaining papillary roof for the removal of biliary stones. We evaluated the efficacy of one-step transfistula balloon dilation following fistulotomy in DBC for the removal of biliary stones.

METHODS

This retrospective multicenter study was performed in four tertiary referral centers. Patients who underwent fistulotomy due to DBC were enrolled. Precut fistulotomy followed by conventional (≤ 10 mm) or large balloon (≥ 12 mm) dilation through the fistulotomy tract was performed to remove biliary stones. The main outcome measures were technical success and transfistula balloon dilation-related complications.

RESULTS

A total of 154 patients were enrolled. Large balloon and conventional balloon dilation were performed in 57 and 97 patients, respectively. The primary technical success of stone removal was 100% (57/57) for large balloon dilation and 96.9% (94/97) for conventional balloon dilation (P = 0.296). The mean procedure time from biliary access to removal of stones was 29.3 min in large balloon and 22.2 min in conventional balloon dilation (P = 0.042), and the mean numbers of endoscopic retrograde cholangiopancreatography sessions were 1.4 and 1.3, respectively (P = 0.175). Transfistula balloon dilation-related complications were not different between the two groups (10.5% in large balloon dilation vs 16.5% in conventional balloon dilation, P = 0.307).

CONCLUSIONS

One-step transfistula balloon dilation following precut fistulotomy in DBC may be safe and effective for the removal of biliary stones. There were no differences in therapeutic outcomes and complications between large and conventional balloon dilation.