American Society for Gastrointestinal Endoscopy guideline on management of post-liver transplant biliary strictures: summary and recommendations

Endohepatology: Applications in Liver Transplant

The term "endohepatology" was coined over the last 15 years to describe the integration of interventional endoscopy and hepatology for the management of patients with chronic liver disease. In this article, we will review the diagnostic and therapeutic applications of endoscopic ultrasound and endoscopic retrograde cholangiopancreatography among liver transplantation candidates and recipients.

Endoscopic Management of Recurrent Anastomotic Biliary Stricture Following Deceased Orthotopic Liver Transplantation

Background/Objectives: Data on the natural history and endoscopic treatment outcomes of recurrent anastomotic biliary stricture (RABS) after orthotopic liver transplantation (OLT) are limited. This study aimed to evaluate the incidence and outcomes of RABS after OLT. Methods: A retrospective single-center study on OLT patients who underwent successful endoscopic treatment of ABS was conducted. The incidence of RABS, risk factors for recurrence, and outcomes of repeat endoscopic therapy were recorded. Results: A total of 131 OLT patients with ABS underwent endoscopic treatment, of which 119 successfully completed an endoscopic treatment course. After a median follow-up of 51.5 months (IQR 18.5-86.25) from ABS resolution, 26/119 patients (22.7%) developed RABS. All patients with RABS underwent a second endoscopic treatment course; 24 patients received self-expandable metal stents and 2 received plastic stents. Re-treatment was successful in 21 patients (80.8%) after a median of 8.5 months (IQR 5.25-14.50) and a total of 62 ERCPs. Adverse events occurred in two patients (7.4%)-one bacteremia and one suprastenotic biliary stricture. After a median follow-up of 65.5 months (IQR 20.75-125.5) from stent removal, only one patient had a second recurrence, which was treated with a Roux-en-Y hepaticojejunostomy. Multivariate analysis showed that older age at ABS diagnosis (OR 1.1; 95% CI: 1.1-1.2 p = 0.04) was the only independent risk factor for recurrence. Conclusions: RABS affects more than 20% of patients after successful endoscopic treatment. A second endoscopic therapy with covered self-expandable metal stents is a safe and effective option and should be considered before more invasive options.

Fully covered self-expandable metal stents versus multiple plastic stents for the treatment of post-orthotopic liver transplant anastomotic biliary strictures: An updated systematic review and meta-analysis of randomized controlled trials

BACKGROUND AND AIMS

The most common adverse event (AE) of orthotopic liver transplantation (OLT) is anastomotic biliary stricture (ABS). Management varies widely between centers, and it is not clear whether a combination of endoscopic dilation of the stenosis followed by multiple plastic stents (MPS) or placement of a fully covered self-expandable metal stent (fcSEMS) is better for the management of post-OLT ABS. This systematic review and meta-analysis aimed to compare the efficacy, safety, and cost of fcSEMS versus MPS in the treatment of post-OLT ABS.

METHODS

We searched PubMed, Cochrane, and Embase databases for randomized controlled trials (RCTs) comparing fcSEMS with MPS for the treatment of patients with post-OLT ABS and reporting at least one of the outcomes of interest. The pooled estimates were calculated using the random-effects model, and I2 statistics were used to evaluate heterogeneity.

RESULTS

The study included 5 RCTs (245 patients). There was no statistically significant difference between fcSEMS and MPS in stricture resolution (RR 0.99; 95% CI 0.88 to 1.11; p = 0.86), stricture recurrence (RR 2.22; 95% CI 0.73 to 6.75; p = 0.16), treatment cost (MD - 5.31 thousand dollars 95% CI -12.76 to 2.13; p = 0.16), and AEs (RR 0.87; 95% CI 0.27 to 2.83; p = 0.82). However, fcSEMS reduced the number of ERCP sessions (MD - 1.7 sessions; CI 95% - 2.9 to - 0.5; p = 0.005) and treatment duration (MD-95.7 days; 95% CI -184.5 to -6.9; p = 0.03) compared with MPS.

CONCLUSION

fcSEMS and MPS had similar efficacy and safety in patients with ABS post-OLT. However, fcSEMS was associated with fewer ERCP sessions and shorter treatment duration.

American Society for Gastrointestinal Endoscopy guideline on gastrostomy feeding tubes: methodology and review of evidence

This article from the American Society for Gastrointestinal Endoscopy (ASGE) provides a full description of the methodology used to inform the final guidance outlined in the accompanying summary and recommendations article for strategies to manage endoscopically placed gastrostomy tubes. This article was developed using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) framework and specifically addresses the utility of PEG versus interventional radiology-guided gastrostomy (IR-G), the need for withholding antiplatelet and anticoagulant medications, appropriate timing to initiate tube feedings, and appropriate selection of the gastrostomy technique in patients with malignant dysphagia. In patients needing enteral access, the ASGE suggests PEG as the preferred technique for initial gastrostomy over IR-G. The ASGE recommends that tube feeding can be safely started within 4 hours of the gastrostomy without the need for an intentional delay. The ASGE suggests that a PEG can be performed without the need to withhold antiplatelet medications. In patients on anticoagulants who need to undergo PEG placement, the ASGE suggests that the periprocedural management of anticoagulants should be based on a multidisciplinary discussion with the patient regarding the risk of bleeding versus cardiovascular adverse events. In patients with malignant dysphagia, either transoral "Pull" PEG or transcutaneous "Direct" PEG can be performed for initial enteral access.

American Society for Gastrointestinal Endoscopy guideline on gastrostomy feeding tubes: summary and recommendations

This clinical practice guideline from the American Society for Gastrointestinal Endoscopy (ASGE) provides an evidence-based approach for strategies to manage endoscopically placed gastrostomy tubes. This document was developed using the Grading of Recommendations Assessment, Development and Evaluation framework. The guideline addresses the utility of PEG versus interventional radiology-guided gastrostomy (IR-G), need for withholding antiplatelet and anticoagulant medications before PEG tube placement, appropriate timing to initiate tube feeding after PEG, and selection of the appropriate technique of gastrostomy in patients with malignant dysphagia. In patients needing enteral access, the ASGE suggests PEG as the preferred technique for initial gastrotomy over IR-G. The ASGE recommends that tube feeding can be safely started within 4 hours of gastrostomy. The ASGE suggests that PEG can be performed without withholding antiplatelet medications. The ASGE suggests that the periprocedural management of anticoagulants should be based on a multidisciplinary discussion regarding the risk of bleeding versus cardiovascular events. In patients with malignant dysphagia, either transoral "pull" PEG or direct PEG can be performed for initial enteral access.

Mechanism and endoscopic-treatment-induced evolution of biliary non-anastomotic stricture after liver transplantation revealed by single-cell RNA sequencing

BACKGROUND

Biliary complications, especially non-anastomotic stricture (NAS), are the main complications after liver transplantation. Insufficient sampling and no recognized animal models obstruct the investigation. Thus, the mechanisms and alterations that occur during endoscopic treatment (ET) of NAS remain unclear.

METHODS

Samples were obtained with endoscopic forceps from the hilar bile ducts of NAS patients receiving continuous biliary stent implantation after diagnosis. Retrospective analysis of multiple studies indicated that the duration of ET for NAS was approximately 1-2 years. Thus, we divided the patients into short-term treatment (STT) and long-term treatment (LTT) groups based on durations of less or more than 1 year. Samples were subjected to single-cell RNA sequencing. Transcriptomic differences between STT and normal groups were defined as the NAS mechanism. Similarly, alterations from STT to LTT groups were regarded as endoscopic-treatment-induced evolution.

RESULTS

In NAS, inflammation and immune-related pathways were upregulated in different cell types, with nonimmune cells showing hypoxia pathway upregulation and immune cells showing ATP metabolism pathway upregulation, indicating heterogeneity. We confirmed a reduction in bile acid metabolism-related SPP1+ epithelial cells in NAS. Increases in proinflammatory and profibrotic fibroblast subclusters indicated fibrotic progression in NAS. Furthermore, immune disorders in NAS were exacerbated by an increase in plasma cells and dysfunction of NK and NKT cells. ET downregulated multicellular immune and inflammatory responses and restored epithelial and endothelial cell proportions.

CONCLUSIONS

This study reveals the pathophysiological and genetic mechanisms and evolution of NAS induced by ET, thereby providing preventive and therapeutic insights into NAS.

HIGHLIGHTS

For the first time, single-cell transcriptome sequencing was performed on the bile ducts of patients with biliary complications. scRNA-seq analysis revealed distinct changes in the proportion and phenotype of multiple cell types during Nonanastomotic stricture (NAS) and endoscopic treatment. A reduction in bile acid metabolism-related SPP1+ epithelial cells and VEGFA+ endothelial cells, along with explosive infiltration of plasma cells and dysfunction of T and NK cells in NAS patients. SPP1+ macrophages and BST2+ T cells might serve as a surrogate marker for predicting endoscopic treatment.

A practical approach to the endoscopic management of biliary strictures after liver transplantation

Biliary tract complications are an important cause of morbidity and mortality after liver transplantation (LT) occurring in 5% to 25% of patients. The most common biliary complication in LT recipients are strictures representing approximately half of these biliary adverse events. Bile duct strictures can be divided into anastomotic biliary strictures (ABS) and non-anastomotic biliary strictures (NABS) depending on their location in the biliary tree, being ABS the most encountered type. Several risk factors identified in previous studies can predispose to the development of ABS and NABS, especially those related to surgical techniques and donor characteristics. Magnetic resonance cholangiopancreatography (MRCP) is the recommended noninvasive imaging test for detecting post-LT biliary strictures, given its high sensitivity and specificity. Once the diagnosis of a biliary stricture after LT has been made, endoscopic retrograde cholangiopancreatography (ERCP) is the preferred initial therapy with good short and long-term results. Biliary sphincterotomy plus balloon dilation (BD) with placement of multiple plastic stents (MPS) has been the classic endoscopic approach for treating ABS, although fully-covered metallic stents (FCSEMS) have emerged as an alternative thanks to shorter total duration of stenting and fewer endoscopic procedures compared to MPS. In this review, we provide a practical update on the management of biliary strictures after LT, focusing our attention on the available evidence in the endoscopic therapy.

Surgical Versus Image-Guided Interventions in the Management of Complications After Liver Transplantation

Liver transplantation is a technically demanding surgical procedure with known complications, and the optimal approach to addressing vascular and biliary complications requires a coordinated effort between surgical and interventional radiology teams. Vascular complications involving the hepatic artery, portal vein, or hepatic veins can be characterized by their mechanism, chronicity, and timing of presentation. These factors help determine whether the optimal therapeutic approach is surgical or endovascular. Very early presentation in the perioperative period favors surgical revision, while later presentation is best addressed endovascularly. Biliary complications can be categorized as leaks or strictures, and coordinated surgical, endoscopic, and percutaneous management is needed to address these types of complications. Through advances in technique and the management of complications, outcomes after liver transplantation continue to improve.

The utility of self-expanding metal stents in benign biliary strictures- a retrospective case series

BACKGROUND

Benign biliary strictures can have a significant negative impact on patient quality of life. There are several modalities which can be utilized with the goal of stricture resolution. These techniques include balloon dilatation, placement of multiple plastic stents and more recently, the use of metal stents. The aim of this study was to evaluate the local success of self-expanding metal stents in successfully resolving benign biliary strictures.

METHODS

This was a single institution, retrospective case series. Patients included in our study were patients who underwent endoscopic retrograde cholangiopancreatography with placement of self expanding metal stents for benign biliary strictures at our institution between 2016-2022. Patients were excluded for the following: malignant stricture, and inability to successfully place metal stent. Data was evaluated using two-sided t-test with 95% confidence interval.

RESULTS

A total of 31 patients underwent placement of 43 self-expanding metal stents and met inclusion criteria. Mean age of patients was 59 ± 10 years, and were largely male (74.2% vs. 25.8%). Most strictures were anastomotic stricture post liver transplant (87.1%), while the remainder were secondary to chronic pancreatitis (12.9%). Complications of stent placement included cholangitis (18.6%), pancreatitis (2.3%), stent migration (20.9%), and inability to retrieve stent (4.7%). There was successful stricture resolution in 73.5% of patients with anastomotic stricture and 33.3% of patients with stricture secondary to pancreatitis. Resolution was more likely if stent duration was > / = 180 days (73.3% vs. 44.4%, p < 0.05). There was no demonstrated added benefit when stent duration was > / = 365 days (75% vs. 60.9%, p = 0.64).

CONCLUSIONS

This study demonstrates that self expanding metal stents are a safe and effective treatment for benign biliary strictures, with outcomes comparable to plastic stents with fewer interventions. This study indicates that the optimal duration to allow for stricture resolution is 180-365 days.