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HOME > Clin Endosc > Volume 58(2); 2025 > Article
Review Endoscopic ultrasound-guided gastroenterostomy, with focus on technique and practical tips
Chi-Ying Yangorcid, Wen-Hsin Huangorcid, Hsing-Hung Chengorcid
Clinical Endoscopy 2025;58(2):201-217.
DOI: https://doi.org/10.5946/ce.2024.206
Published online: March 4, 2025

Center for Digestive Medicine, Department of Internal Medicine, China Medical University Hospital, China Medical University, Taichung, Taiwan

Correspondence: Wen-Hsin Huang Center for Digestive Medicine, Department of Internal Medicine, China Medical University Hospital, China Medical University, No. 2, Yude Road, North District, Taichung City 404327, Taiwan E-mail: u97766.huang@msa.hinet.net
• Received: July 31, 2024   • Revised: November 14, 2024   • Accepted: November 24, 2024

© 2025 Korean Society of Gastrointestinal Endoscopy

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Gastric outlet obstruction (GOO) is a condition characterized by a mechanical obstruction of the stomach or duodenum, caused by either benign or malignant disease. Traditionally, surgical gastrojejunostomy (SGJ) has been the standard treatment for malignant GOO and endoscopic stenting (ES) offers a less invasive option, but it often requires repeat interventions. Recently, endoscopic ultrasound (EUS)-guided gastroenterostomy (EUS-GE), an innovative technique, has been applied as an alternative to SGJ and ES for GOO patients. Direct EUS-GE, device-associated EUS-GE, and EUS-guided double balloon-occluded gastrojejunostomy bypass are the most commonly used techniques with reported technical success rates ranging from 80% to 100%, and clinical success rates between 68% and 100%. Adverse event (AE) rates range from 0% to 28.2% and the stent misdeployment is the most common while other AEs include abdominal pain, bleeding, infection, peritonitis, bowel perforation, gastric leakage, and stent migration. It is clear that EUS-GE may achieve a similar clinical success to SGJ with fewer AEs and a shorter hospital stay. Compared to ES, EUS-GE showed higher clinical success, fewer stent obstructions, and lower reintervention rates.
  • Keywords: Endosonography; Gastric outlet obstruction; Gastroenterostomy; Interventional ultrasound
Gastric outlet obstruction (GOO) is a clinical feature of mechanical obstruction of the stomach or duodenum that causes symptoms such as epigastric pain, vomiting, weight loss, and bloating.1 GOO may be attributed to a variety of benign or malignant diseases (Table 1). In recent decades, malignant disease has been the leading cause of GOO, including gastric, pancreatic, ampulla of Vater, duodenal, and metastatic cancers. Peptic ulcers are the most common benign cause of mechanical obstruction.2,3 Surgical gastrojejunostomy (SGJ), a bypass surgery for maintaining oral nutrition, is the conventional mainstay of treatment for malignant GOO. A meta-analysis of 13 studies showed that the incidence of major complications, including respiratory tract infection, myocardial infarction, acute renal failure, sepsis, and liver failure, was higher in the open surgical jejunostomy group.4 Enteral metal stent placement is a less invasive alternative treatment for the palliation of malignant GOO. Patients with endoscopic stenting (ES) had a shorter hospital stay, earlier oral intake, and fewer surgical site infections but a higher reintervention rate.5
Endoscopic ultrasound (EUS)-guided gastroenterostomy is a novel approach that serves as an alternative to SGJ and ES in patients with GOO. This technique involves the placement of a lumen-apposing metal stent (LAMS) between the stomach and a loop of the duodenum or jejunum to create an effective bypass for the obstruction. EUS-guided gastrostomy was first described by Fritscher-Ravens et al.6 in 2002 using an animal model to perform EUS-guided suturing of the stomach and small intestine for anastomosis. In 2011, Binmoeller and Shah7 first reported the use of LAMS for EUS-guided transluminal drainage. The LAMS is a dumbbell-shaped fully covered metal stent with perpendicular flanges that creates an anastomosis between the two structures. The stent with the electrocautery-enhanced delivery system developed by Dr. Binmoeller combined puncture, dilation, and metal stent placement in a single device. In the early days, the placement of LAMS without an electrocautery tip device required a more complicated process, involving an initial needle puncture, followed by passing a guidewire through the needle tract and dilating the tract with a balloon or cautery dilator catheter. Finally, the stent is deployed under guidewire guidance. This process presents challenges, as the guidewire could push the small intestine out of the endoscopic view or result in loss of the target site. To overcome these challenges, various types of LAMS have been designed and reported (Table 2). These advancements have simplified the procedure and improved its overall effectiveness.8 The EUS-guided gastroenterostomy technique may offer a balance between the advantages and disadvantages of the SGJ and ES, providing a minimally invasive alternative for patients with GOO.
Indication and contraindication
Indications for EUS-guided gastroenterostomy (EUS-GE) include symptomatic malignant GOO in patients who are unwell or at high surgical risk or have benign GOO, where conventional endoscopic or surgical options are not feasible or have failed.9 Afferent loop syndrome is a possible indication for EUS-GE, particularly in patients with malignancies. Under EUS guidance, a dilated blind loop can be easily identified as the puncture site, providing an effective and minimally invasive treatment method. Meta-analysis of a total of 35 cases showed high technical and clinical success rates (100%, 35/35). The adverse event (AE) rate was 11.4% (4/35), all of which involved abdominal pain.10
EUS-GE is contraindicated in patients with massive ascites, diffuse infiltrative gastric cancer, or extensive peritoneal carcinomatosis.9 Diffuse gastric cancer infiltration thickens the stomach, and an appropriate bowel loop close to the stomach cannot be identified under EUS. Peritoneal metastases may present as distal or multiple intestinal strictures. In addition, large amounts of ascites may destabilize the small intestine and increase the risk of mispuncture.
Pre-procedure preparation and plan
Comprehensive imaging studies are recommended before the EUS-GE procedure, including abdominal computed tomography and upper gastrointestinal (GI) series (Fig. 1), and are conducted to assess the length of the GOO and the anatomical relationship between the stomach and small intestine to predict the difficulty of performing EUS-GE.11 This approach excluded the possibility of multi-segment stenosis, peritoneal metastasis, or identification of any potential anatomical variations or complications, such as the presence of adhesions or a distorted anatomy due to previous surgeries.
Prevention of bowel spasms is important. Warm saline, hyoscine butylbromide (Buscopan®), and glucagon have also been suggested. When the small intestine remains peristaltic, a puncture or LAMS placement is difficult to achieve. Therefore, it is important to reduce or inhibit peristalsis in the small intestine. The use of warm normal saline to distend the small intestine can reduce peristalsis and spasms.12 Hyoscine butylbromide, an anticholinergic drug, acts on the smooth muscles of the intestine. By blocking the acetylcholine receptors at nerve endings, it reduces smooth muscle contraction and peristalsis, leading to anti-spasmodic and anti-motility effects. Glucagon is a hormone that plays an important role in glucose metabolism by inhibiting intestinal motility in the GI system through smooth muscle relaxation and decreased acetylcholine release. As an immediate reduction in intestinal motility is required during the procedure, glucagon is administered via intravenous injection for a rapid onset of action.13
Although several EUS-GE techniques have been published, no standard guidelines have been established. This procedure can be broadly divided into two parts: the creation and identification of bowel dilation and stent placement. Currently, direct EUS-GE, device-associated EUS-GE, and EUS-guided double balloon-occluded gastrojejunostomy bypass (EPASS) are the most commonly used techniques.
Direct EUS-GE
The echoendoscope was advanced into the middle body of the stomach to identify the loop of the small intestine adjacent to the stomach that could be safely accessed. Anti-peristaltic drugs, such as glucagon or hyoscine butylbromide, can be administered to reduce intestinal peristalsis. If visualization of the jejunal loop under EUS was inadequate, a 22-gauge needle was punctured into the jejunum and saline was infused to distend the bowel loop. Subsequently, a 19-gauge needle puncture (Fig. 2A) was used to deliver the contrast medium, methyl blue, or indigo carmine with saline to identify the small intestine. Once the target intestinal loop was adequately visualized, a 19-gauge needle was used to aspirate the blue fluid and ensure target-loop puncture. This was followed by advancing a 0.025-inch or 0.035-inch guidewire from the needle into the downstream intestine. The needle tract is subsequently dilated using either a balloon or an electrocautery dilator. The LAMS was then deployed over the guidewire.14-30
Direct deployment with electrocautery-enhanced LAMS offers a convenient alternative, eliminating the need for a guidewire step and preventing accidental displacement of the target loop during guidewire manipulation. Furthermore, direct insertion of the LAMS device makes the procedure more efficient.
The retrograde technique offers an alternative approach (Fig. 2B) with the initial steps following the standard procedure described above. A 0.025-inch or 0.035-inch guidewire was advanced through the needle, passed from the jejunum to the stomach, and then exited through the mouth. The guidewire was securely tracked and the LAMS was deployed antegrade over the guidewire. Another method for retrograde LAMS deployment is the use of a linear echoendoscope to advance and pass through the stricture over the guidewire (Fig. 2C). In this approach, the LAMS is deployed from the small intestine into the stomach over a guidewire, creating a gastroenterostomy.
Devices-assisted EUS-GE
Unlike the direct method, various specialized devices, such as double-balloon catheters, retrieval balloons, nasojejunal tubes, and ultraslim endoscopes, are used to cross the stricture and infuse warm saline into the target intestine. Hyoscine butylbromide and glucagon were prescribed before and during the procedures. Under EUS guidance, the target site for LAMS puncture is a dilated balloon (balloon-assisted) or the distended intestine (assisted by orojejunal catheter or an ultraslim endoscope). The LAMS was deployed to create a gastroenterostomy with or without a guidewire.

1) The balloon-assisted

A 0.025-inch or 0.035-inch guidewire was carefully maneuvered through the stricture site into the proximal jejunum under endoscopic and fluoroscopic guidance. The endoscope was then slowly withdrawn under fluoroscopic guidance, and the balloon catheter (retrieval balloon catheter, dilation balloon catheter, or double balloon catheter) was advanced over the guidewire below the obstruction site and into the jejunum (Fig. 2D). Under EUS guidance, a 19-gauge needle was used to puncture the inflated balloon. Another 0.025-inch or 0.035-inch guidewire was then passed through the needle and further into the jejunum. The LAMS was deployed as described above to perform a gastroenterostomy.14-17,19,22,25-27,29-31

2) Orojejunal catheter (nasobiliary drain, nasojejunal tube)-assisted

Similar to the balloon method, a 7-10 Fr orojejunal catheter (nasobiliary drain tube or 14 Fr nasojejunal tube) was inserted over the guidewire (Fig. 2E). The endoscope was slowly withdrawn, leaving a nasojejunal tube in the proximal jejunum. Warm saline was infused through a nasojejunal tube to fill and distend the small intestinal lumen. The addition of a contrast medium, methyl blue, or indigo carmine to saline can help identify the small intestine. A dilated enteric loop adjacent to the stomach wall is identified under EUS guidance. The deployment of the LAMS, as described above, or with an electrocautery tip without a guidewire creates a gastroenterostomy (Fig. 3).15,19,23,24,26,30,32-43

3) Ultraslim endoscope assisted

An ultraslim endoscope was advanced into the stricture and carefully and slowly passed through the stricture into the small intestine. Saline was infused into the small intestine using an ultraslim endoscope to distend the jejunum. The linear echoendoscope was then advanced into the stomach along the side of the ultraslim endoscope (Fig. 2F). A distended jejunal loop and ultraslim endoscope can be detected using EUS. A 19-gauge needle was used to puncture the small intestine and a 0.025-inch or 0.035-inch guidewire was passed through the needle downstream of the dilated intestine. An ultraslim endoscope can visualize the guidewire directly. The LAMS was deployed to create a gastroenterostomy, as described above.15,26,40,44,45

4) EUS-guided double balloon-occluded gastrojejunostomy bypass

This novel device and technique were published by Itoi et al.,46 with a double-balloon enteric tube (Tokyo Medical University type; Create Medic Co., Ltd.) being advanced into the proximal jejunum under guidewire and fluoroscopic guidance (Fig. 2G). Two balloons (20 cm apart) were inflated with saline and contrast media at the two ends. The tubular balloon between the two end balloons was inflated with saline and identified using a linear echoendoscope. The electrocautery-enhanced LAMS was punctured and deployed in one step, as described above.16,25,27,33,46-50
EUS-guided gastroenterostomy has been shown to be an effective treatment for malignant and benign GOO. Several recent studies have reported technical success rates ranging from 80% to 100%, and clinical success rates ranging from 68% to 100%, as summarized in Table 3.14-45,46,49,50 Most clinical success rates were defined as a GOO score (no diet=0, liquid=1, semi-solid=2, solid/full diet=3) ≥2 points or an increase in the GOO score by at least one point.51 The AEs rates were 0% to 28.2%, and commonly reported AEs included abdominal pain, bleeding, infection, peritonitis, bowel perforation, gastric leakage, stent migration, and stent occlusion. The diameters of the commonly used LAMS are 15-mm and 20-mm. Bejjani et al.22 reported that both 15-mm and 20-mm LAMS are safe and effective in patients with malignant GOO. However, the 20-mm LAMS facilitated a more advanced diet. A meta-analysis of 13 studies, including 685 patients, revealed that the technical success rate, clinical success rate, and AEs were not significantly different between 15-mm and 20-mm LAMS. There was a statistically significant increase in the reintervention for patients who received the 15-mm LAMS compared to the 20-mm LAMS (15-mm LAMS, 10.3%; 20-mm LAMS, 3.5%).52
Recently, systematic reviews and meta-analyses of EUS-GE outcomes have been published. Iqbal et al.53 conducted a systematic review and meta-analysis of 12 studies, including 285 patients, to evaluate the efficacy and safety of EUS-GE in 2019. The average technical success rate was found to be 92% (95% confidence interval [CI], 88%–95%), while the average clinical success rate was 90% (95% CI, 85%–94%). The overall AE rate was 12% (95% CI, 8%–16%), with stent misdeployment (SM), abdominal pain, bleeding, peritonitis, and stent migration being the most common complications. Unexpected reintervention was noted in 9% of patients (95% CI, 6%–13%). In 2022, Ribas et al.54 reviewed and analyzed 20 studies involving 863 patients and showed that the technical success rates were 94.8% in direct puncture group and 93.6% in balloon-assisted group, whereas the clinical success rates were 90.6% in direct puncture group and 88.9% in balloon-assisted group. No statistically significant differences were observed in technical and clinical success rates. However, as compared to balloon-assisted techniques, direct puncture techniques resulted in a lower rate of AEs (direct puncture, 9.3% vs. balloon-assisted, 21.4%; p=0.001), and a shorter length of hospital stay (direct puncture, 4.17±7.1 days vs. balloon-assisted, 6.85±9.33 days; p=0.001). In a sub-analysis, balloon-assisted GE demonstrated a lower rate of AEs compared to that of EUS-EPASS group (balloon-assisted, 8.9% vs. EPASS, 28.5%; p=0.004).
EUS-guided GE and SM are distinct approaches for managing malignant GOO. In a propensity score-matched retrospective study conducted by Conti Bellocchi et al.,55 EUS-GE (n=65, matched n=45) was compared with ES (n=130, matched n=45) for patients with malignant GOO. There were no significant differences in technical success rates (EUS-GE, 100% vs. ES, 100%), clinical efficacy (EUS-GE, 95.6% vs. ES: 86.7%; p=0.226), or AE rate (EUS-GE, 15.5% vs. ES, 33.3%; p=0.085) between the two groups. Stent dysfunction requiring reintervention occurred more commonly in the ES group (EUS-GE, 4.4% vs. ES, 20.0%; p=0.022) while a significantly shorter hospital-stay was observed in EUS-GE group (EUS-GE, 7.5±4.9 days vs. ES, 12.5±13.0 days; p=0.018). A recent meta-analysis that included 13 studies with a total of 1,762 patients showed a technical success rate of 95.59% in EUS-GE group and 97.96% in ES group. The average clinical success rate of EUS-GE group was higher than that of ES group (EUS-GE, 93.63% vs. ES, 85.57%; pooled odds ratio, 2.72). The average AE rate was 8.97% and 19.63% for EUS-GE and ES, respectively. The average reintervention rate for EUS-GE was lower that for ES (EUS-GE, 3.77% vs. ES, 25.13%).56
Traditionally, SGJ has been used to treat GOO. Kouanda et al.57 reported that patients with EUS-GE have shorter procedure time, earlier oral intake (EUS-GE, 1.3±1.0 days vs. SGJ, 4.7±2.7 days; p<0.001), shorter hospital stay (EUS-GE, 5 days vs. SGJ, 14.5 days; p<0.001) as compared to those with SGJ. In addition, the hospitalization costs in EUS-GE group were less than SGJ (EUS-GE, 49,387±33,067 United States dollars [USD] vs. SGJ, 124,912±32,855 USD; p<0.001). In 2023, Canakis et al.58 reported a multicenter retrospective comparative study demonstrating that the technical (EUS-GE, 97.4% vs. SGJ, 100%) and clinical success rates (EUS-GE, 94.1% vs. SGJ, 94.3%) were similar between the two groups. The EUS-GE group had lower AE rates (EUS-GE, 13.4% vs. SGJ, 33.3%) but higher reintervention rates (EUS-GE, 15.5% vs. SGJ, 1.6%). Additionally, patients who underwent EUS-GE received chemotherapy significantly sooner after the procedure (EUS-GE, 16.6 days vs. SGJ, 37.8 days). Furthermore, large prospective randomized trials comparing EUS-GE with SGJ and ES for the management of malignant or benign GOO are needed.
Stent misdeployment
SM is a serious and common AE of EUS-GE that can lead to intestinal perforation or gastrocolic fistulas. The AE rate of SM was 4.6% according to a meta-analysis reported by Giri et al. in 2024.59 Ghandour et al.60 classified SM during EUS-GE into four types. Type I SM refers to the deployment of the distal flange in the peritoneum and the proximal flange in the stomach without enterotomy. Type II SM occurs when the distal and proximal flanges are in the peritoneum and stomach, respectively, with the stent penetrating and migrating out of the small bowel. Type III SM involves the distal flange in the small bowel and the proximal flange in the peritoneum. Type IV SM is defined by the localization of the distal flange in the colon and the proximal flange in the stomach, creating a gastrocolic anastomosis. Type I SM was the most common (63.1%), followed orderly by types II (30.4%), type IV (4.3%), and type III (2.2%). SM of all types, except type III, can be salvaged by endoscopic management, including LAMS redeployment, duodenal stenting, or duodenal dilatation, while one case of type III SM was subjected to surgical GE. The feasibility of endoscopic rescue should be determined based on certain factors, including patient condition, endoscopist expertise, and availability of materials and devices. Kuo and Wang61 reported that the presence of a tent-like sign when puncturing the LAMS was an indicator of SM in the peritoneum (Fig. 4). Direct freehand techniques for the puncture and deployment of LAMS result in a lower incidence rate of SM than wire-guided insertion.59 For successful LAMS deployment, the distance between the targeted bowel loop and stomach wall must be shorter than the length of the LAMS (e.g., Hot AXIOS, distance <1–1.5 cm). This distance ensures safe and full deployment of the stent and the creation of a mature anastomotic tract. In addition, the target bowel loop must be expanded as much as possible using saline to avoid opening the distal flange within the peritoneum due to insufficient distance.
The learning curve is particularly important, owing to the complexity of EUS-GE procedures. In addition to familiarity with the steps of EUS-GE, it is necessary to handle procedure-related complications. Tyberg et al.62 demonstrated that ample experience with at least seven cases of EUS-GE may reduce the procedure time. Furthermore, the learning curve for EUS-GE reported by Jovani et al.21 suggests that approximately 25 procedures are the minimum requirement for proficiency, whereas approximately 40 cases are required to achieve the master level. The rate of AEs is largely influenced by proficiency level.
Although EUS-GE has developed over the years and has become increasingly popular, the technologies available for EUS-GE are diverse, and there is no unified procedure. Most of the current research is retrospective, and there are no prospective studies focusing on the comparison of different techniques. A specially designed double-balloon enteric tube (Tokyo Medical University type) for EPASS is only available in some countries. Therefore, the choice of EUS-GE technique remains based on endoscopist discrimination. Various LAMSs have recently been developed. The AXIOS stent (Boston Scientific) was the most commonly used stent in the studies, while the Spaxus stent (Taewoong Medical) was used in a few studies.20,35 Mangiavillano et al.35 reported a novel electrocautery LAMS (Hot-Spaxus) for GOO with a technical success rate of 100%, but a clinical success rate of 68%, which is lower than other studies. The author pointed out that this may be related to the smaller stent sizes used in the first five cases because the endosonographers were unfamiliar with the EUS-GE procedure. However, whether different LAMS have different outcomes needs to be verified in future research.
Peritoneal carcinomatosis and massive ascites are contraindications for EUS-GE, but are also a challenge in SGJ. The presence of moderate to severe ascites was identified as a predictor of procedural failure, with a significantly lower technical success rate of 42.9% compared to patients with mild or no ascites (89.3%, p=0.018) undergoing EUS-GE.20 Basha et al.33 published that there was no significant difference in technical success rate (91.6% vs. 89.4 %, p=0.841), clinical success rate (83.3% vs.89.4%, p=0.619), mean procedure time (32 min vs. 31.6 min, p=0.968), or AEs (0% vs. 10.5%, p=0.245) between patients with or without ascites. EPASS was applied in 87% of patients, and the rest used nasobiliary drain assisted method. However, the median survival time of the patients with ascites was shorter than that of the patients without ascites (36 vs. 290 days, p<0.001). Abbas et al.45 reported the outcomes of EUS-GE and SGJ for malignant GOO in patients with peritoneal carcinomatosis. The technical success rate (EUS-GE, 100%; SGJ, 100%) and clinical success rates (EUS-GE, 88% vs. SGJ, 85%; p>0.99) were not significantly different in both groups. The recurrence rate of obstruction in the EUS-GE group was lower than that in the SGJ group (EUS-GE, 28% vs. SGJ, 41%; p=0.13). Therefore, whether ascites or peritoneal cancer is an absolute contraindication depends on the patient's condition, and more prospective randomized trials are required.
In conclusion, EUS-guided gastroenterostomy has emerged as an effective and safe treatment option for patients with GOO. The available evidence suggests that EUS-GE is associated with improved outcomes and reintervention rates compared with enteral stenting, with earlier oral intake and shorter hospital stay compared with SGJ, making it a valuable and minimally invasive alternative for the management of GOO. For beginners performing EUS-GE, it is important to be familiar with the deployment steps of LAMS and EUS-GE to avoid AEs. Development of appropriate training models can increase procedural proficiency and reduce the incidence of AEs. However, the effectiveness of the different methods and the relative advantages of EUS-GE should be validated through prospective randomized controlled trials.
Fig. 1.
(A) Upper gastrointestinal (UGI) series image shows the filling defect (tumor) is noted at the second portion of duodenum (type II gastric outlet obstruction). The direction and pattern of the proximal small intestine are visualized by the contrast media enhancement. (B) A 7-Fr nasobiliary catheter tube is inserted through the guidewire into the proximal jejunum. Saline and contrast media is infused through the nasobiliary drainage tube and the pattern of the small intestine is similar to that visualized by UGI series. (C) Abdominal computed tomography (CT) reveals the proximal jejunum goes to the right side after the small intestine passes through the ligament of Treitz. (D) The direction and pattern of the proximal jejunum is also similar with abdominal CT image.
ce-2024-206f1.jpg
Fig. 2.
Techniques of endoscopic ultrasound-guided gastroenterostomy (EUS-GE). (A) Direct technique. (B) Rendezvous guidewire technique. (C) Retrograde deployment technique. (D) Balloon-assisted technique. (E) Orojejunal catheter (nasobiliary drain, nasojejunal tube)-assisted technique. (F) Ultraslim endoscope assisted. (G) EUS-guided double balloon-occluded gastrojejunostomy bypass. LAMS, lumen-apposing self-expandable metal stent.
ce-2024-206f2.jpg
Fig. 3.
Steps of endoscopic ultrasound (EUS)-guided gastroenterostomy using nasobiliary drain assisted technique. (A) A 0.035-inch guidewire is passed into the proximal jejunum guided by large size of retrieval balloon. (B) Under endoscopic and fluoroscopic guidance, a 7-Fr nasobiliary catheter tube is inserted through the guidewire into the proximal jejunum. (C) Saline and contrast media are infused through the nasobiliary drainage tube to inflate the proximal enteric loops. (D) The saline-distended loops of the proximal small bowel are identified by using EUS. (E) EUS-guided puncture and successful deployment of lumen-apposing metal stents (LAMS). (F) The endoscopic view of the deployed LAMS is confirmed by visualizing blue-dyed water (methylene blue) infused through the nasobiliary drain.
ce-2024-206f3.jpg
Fig. 4.
Type I stent misdeployment. (A) A tent-like sign of the bowel wall (arrows) is visualized by endoscopic ultrasound (EUS) and it means that the EUS-guided puncture does not actually penetrate into the lumen of the small intestine. (B) The distal flange of the lumen-apposing metal stent opens in the peritoneum outside the small intestine.
ce-2024-206f4.jpg
Table 1.
Etiology of gastric outlet obstruction
Malignant disease Benign disease
Pancreatic cancer Peptic ulcer disease
Bile duct cancer Acute pancreatitis
Gallbladder cancer Chronic pancreatitis
Ampulla of Vater cancer Caustic ingestion
Gastric cancer Crohn’s disease
Duodenal cancer Postendoscopic therapy
Postradiotherapy
Metastatic tumor or lymph nodes Superior mesenteric syndrome
Miscellaneous
Table 2.
Type of lumen-apposing metal stents
LAMS Hot AXIOS Hot-Spaxus Z-EUS IT (Hanarostent Plumber) Novel LAMS Nagi Aixstent
Manufacturer Boston Scientific; Natick, MA, USA Taewoong Medical; Gimpo, Korea M.I Tech; Pyeongtaek, Korea Micro-Tech Co., Ltd.; Nanjing, China Taewoong Medical; Gimpo, Korea Leufen Medical; Berlin, Germany
ce-2024-206i1.jpg ce-2024-206i2.jpg ce-2024-206i3.jpg ce-2024-206i4.jpg ce-2024-206i5.jpg ce-2024-206i6.jpg
Flange diameter (mm) 14, 17, 21, 24, 29 23, 25, 31 22, 24, 26, 28 20-26 20 25
Length (mm) 8, 10, 15 20 Total length: 20, 30, 40 20 10, 20, 30 30
Usable length: 13, 23, 33
Length diameter (mm) 6, 8, 10, 15, 20 8, 10, 16 10, 12, 14, 16 12–16 10, 12, 14, 16 10, 15
Delivery Catheter (Fr) 9, 10.8 10 10.5 9, 10.5 9, 10 10
Electrocautery tip Yes Yes Yes Yes No No

LAMS, lumen-apposing metal stent.

Table 3.
Outcome of endoscopic ultrasound-guided gastroenterstomy
Study Type of study No. of sizes (n) Etiology Technique Type of LAMS Diameter of LAMS (mm) Technical success (%) Clinical success (%) AE (%) Detail of AEs Recurrent GOO (%)
Khashab et al. (2015)14 Multicenter, retrospective 10 Malignant, n=3; benign, n=7 Direct, n=1; balloon-assisted, n=9 NEC LAMS (AXIOS) 15×10 90 90 0 0 0
Itoi et al. (2016)46 Single center, prospective 20 Malignant, n=20 EPASS, n=20 EC LAMS (Hot AXIOS) 15×10 90 90 10 Misdeployment and pneumoperitoneium, n=2 0
Tyberg et al. (2016)15 International multicenter, retrospective 26 Malignant, n=17; benign, n=9 Direct, n=3; balloon-assisted, n=13; nasobiliary drain, n=3; USE-assisted, n=5; NOTES, n=2 NEC LAMS, n= 17 15×10, n=25; 10×10, n=1 92 85 11.5 Peritonitis, n=1; bleeding, n=1; abdominal pain, n=1 0
EC LAMS (Hot AXIOS), n= 9
Chen et al. (2017)25 (EUS-GE vs. ES) International multicenter, retrospective 30 Malignant, n=30 Direct, n=2; balloon-assisted, n=6; EPASS, n=22 EC LAMS (Hot AXIOS), n=20; NEC LAMS (AXIOS), n=7; NECL LAMS (Spaxus), n=2 15×10 86.7 83.3 10 Misdeployment, n=3 4.3
Perez-Miranda et al. (2017)26 (EUS-GE vs. SGJ) Multicenter, retrospective 25 Malignant, n=17; benign, n=8 Direct, n=6; balloon-assisted, n=9; USE-assisted, n=7; nasobiliary drain, n=3 EC LAMS (Hot AXIOS), NEC LAMS (AXIOS) NA 88 84 12 Bleeding, n=2; peritonitis, n=1 0
Khashab et al. (2017)27 (EUS-GE vs. SGJ) International multicenter, retrospective 30 Malignant, n=30 Direct, n=2; balloon-assisted, n=6; EPASS, n=22 EC LAMS (Hot AXIOS), n=21; NEC LAMS (AXIOS), n=7; NEC LAMS (Spaxus), n=2 NA 87 87 16 Misdeploymenet, n=3; abdominal pain, n=2 3
Chen et al. (2018)16 International multicenter, retrospective 26 Benign, n=26 Direct, n=15; balloon-assisted, n=7; EPASS, n=4 NEC LAMS, n=2; EC LAMS (Hot AXIOS), n=24 15×10 96 84 11.5 Misdeployment, n=2; gastric leakage, n=1 4.8
Chen et al. (2018)17 Multicenter, retrospective 74 Malignant, n=49; benign, n=25 Direct, n=52; balloon-assisted, n=22 NEC LAMS, n=14; EC LAMS (Hot AXIOS), n=59 15×10 93.2 (direct, 94.2%; balloon-assisted, 90.9%) 91.9 (direct: 92.3%; balloon-assisted, 90.9%) 6.8 (direct: 5.8%; balloon-assisted, 9.1%) Misdeployment, n=5 9.5
Ge et al. (2019)28 (EUS-GE vs. ES) Single center, retrospective 22 Malignant, n=22 Direct, n=22 EC LAMS (Hot AXIOS) 15×10 100 96 18.1 Misdeployment, n=2; LAMS mesh erosion, n=1; stent ingrowth, n=1 4.5
Kerdsirichairat et al. (2019)18 Single center, retrospective 57 Malignant, n=34; benign, n=23 Direct, n=57 EC LAMS (Hot AXIOS) 15×10 92.9 89.5 3.5 Leakage, n=1; hemoperitoneium, n=1 15.1
James et al. (2020)19 Single center, retrospective 22 Benign, n=22 Direct, n=9; balloon-assisted, n=8; orojejunal, n=5 NEC LAMS, EC LAMS (Hot AXIOS) 15×10, n=16; 20×10, n=5 95.4 NA 19 Abdominal pain, n=1; bleeding, n=1; stent migration, n=1; necrotizing pancreatitis, n=1 23.8
Kastelijn et al. (2020)29 International multicenter, retrospective 45 Malignant, n=45 Direct, n=36; balloon-assisted, n=9 EC LAMS (Hot AXIOS) 15×10, n=32; 20×10, n=12 86.7 73.3 26.7 Misdeploymenet, n=5; infection, n=6; stent dislocation, n=1 6.1
Xu et al. (2020)49 Single center, retrospective 36 Malignant, n=36 EPASS, n=36 EC LAMSa) NA 100 94.4 25 Misdeploymenet, n=1; bleeding, n=2; metal stent cutting the guidewire, n=3; stent migration, n=2; peritonitis, n=3; delayed bleeding, n=2 2.7
Wannhoff et al. (2021)20 Single center, retrospective 35 Malignant, n=33; benign, n=2 Direct, n=22; nasobiliary, n=10; others, n=2 NEC LAMS (Spaxus; HANARO), EC LAMS (Hot AXIOS) Hot AXIOS, n=31; 10×10, n=1; 15×10, n=18; 20×10, n=12; Niti-S Spaxus, 16×20, n=2; HANARO, 16×40, n=1 80 74.3 14.3 Peritonitis, n=3; perforation, n=1; misdeployment, n=1 NA
Bronswijk et al. (2021)37 (EUS-GE vs. SGJ) International multicenter, retrospective 77 Malignant, n=74; benign, n=3 Nasobiliary, n=77 EC LAMS (Hot AXIOS) NA 94.8 92.2 6.5 Misdeployment, n=2; fever, n=2; sepsis, n=1 0
Havre et al. (2021)38 Single center, retrospective 33 Malignant, n=28; benign, n=5 Nasobiliary, n=33 EC LAMS (Hot AXIOS) 15×10, n=22; 20×10, n=7 100 0.91 30 Stent migration, n=3; bleeding, n=2; pneumonia, n=3; refeeding syndrome, n=1; more puncture, n=1 0
Jovani et al. (2021)21 Single center, retrospective 73 Malignant, n=64; benign, n=9 Direct, n=73 EC LAMS (Hot AXIOS) 15×10, n=64; 20×10, n=4 93 (68/73) 97 (66/68) 7.4 Misdeployment, n=3; hemoperitoneium, n=1; stent migration, n=1 15
Sobani et al. (2021)31 Single center, retrospective 31 Malignant, n=23; benign, n=8 Balloon-assisted, n=31 EC LAMS (Hot AXIOS) 20×10 100 93.5 3.2 Bleeding, n=1 0
Basha et al. (2021)33 Single center, retrospective 31 Malignant, n=29; benign, n=2 EPASS, n=27; nasobiliary, n=4 EC LAMS (Hot AXIOS) 15×10, 20×10 90.3 (ascites, 91.6%; without ascites, 89.4%) 87.1 (ascites, 83.3%; without ascites, 89.4%) 6.4 (ascites, 0%; without ascites, 10.5%) Colonic perforation, n=1; bleeding, n=1 NA
Nguyen et al. (2021)34 Single center, retrospective 42 Malignant, n=35; benign, n=7 oroenteric catheter-assisted EC LAMS (Hot AXIOS) 15×10 98 93 7 Misdeployment, n=1; stent occlusion, n=2 NA
Bejjani et al. (2022)22 International multicenter, retrospective 267 Malignant, n=267 Direct, balloon-assisted EC LAMS (Hot AXIOS) 15×10, n=148; 20×10, n=119 95.5 (15-mm LAMS, 96%; 20-mm LAMS, 95%) 87 (15-mm LAMS, 89.2%; 20-mm LAMS, 84.1%) 12.4 (15-mm LAMS, 12.8%; 20-mm LAMS, 11.8%) Misdeployment, n=23; aspiration pneumonia, n=3; small-bowl perforation, n=2; shock/bacteremia, n=2; peritonitis, n=1; others, n=2 1.9 (5/267)
Abbas et al. (2022)45 Single center, prospective 50 Malignant, n=50 USE-assisted EC LAMS (Hot AXIOS) 15×10, 20×10 100 92 4 LAMS dislodgement, n=1; gastro-colonic fistula, n=1 16
Sánchez-Aldehuelo et al. (2022)39 (EUS-GE vs. ES) Multicenter, retrospective 79 Malignant, n=79 Nasobiliary, n=79 EC LAMS (Hot AXIOS) 15×10, 20×10 93.7 92.4 10.1 Misdeployment, n=3; bleeding, n=2; perforation, n=1; severe pain, n=1; aspiration, n=1 2.5 (2/79)
Fischer et al. (2022)40 Two-center, retrospective 45 Malignant, n=39; benign, n=4; unclear, n=2 USE-assisted, n=18; nasobiliary, n=27 EC LAMS (Hot AXIOS) 10×10, n=1; 15×10, n=14; 20×10, n=30 98 95 24 Stent misplacement, n=7; bleeding, n=2; leakage, n=1; gastrojejunocolic fistula, n=1 18
Choi et al. (2022)41 Single center, retrospective 52 Malignant, n=41; benign, n=11 Endoscope-assisted nasobiliary NEC LAMS (AXIOS), n=6; EC LAMS (Hot AXIOS), n=46 10×10, n=3; 15×10, n=47; 20×10, n=1 92.3 80.8 26.9 Misdeployment, n=7; pneumoperitoneium, n=2; migration, n=1; miscellaneous, n=4 17.3
Mahmoud et al. (2022)30 Single center, retrospective 55 Malignant, n=55 Direct, n=7; dual scope assisted, n=10; balloon-assisted, n=8; nasobiliary, n=30 NEC LAMS (AXIOS), n=1; EC LAMS (Hot AXIOS), n=54 NA 94.8 (55/58) 91.7 (51/55) (ascites, 91.7%; without ascites, 93.5%) 27.2 (15/55) (ascites, 37.5%; without ascites, 19.4%) Misdeployment, n=5; stent migration, n=1; abdominal pain, n=5; DVT, n=1; tissue ingrowth, n=1; cholangitis, n=1; peritonitis, n=2; sepsis, n=2 3.6
Perez-Cuadrado-Robles et al. (2022)42 Single center, retrospective 28 Malignant, n=28 Oroenteric catheter-assisted EC LAMS (Hot AXIOS) 20×10 89.3 88 7.1 Gastrocolic fistula, n=1; colonic perforation, n=1 18.2
van Wanrooij et al. (2022)32 (EUS-GE vs. ES) International multicenter, retrospective 107 Malignant, n=107 Nasobiliary EC LAMS (Hot AXIOS) 15×10, 20×10 94 91 10.2 Misdeployment, n=3; aspiration pneumonia, n=1; cholangits, n=3; bleeding, n=1 1
Garcia-Alonso et al. (2023)43 Multicenter, prospective 64 Malignant, n=64 Nasobiliary EC LAMS (Hot AXIOS) 15×10, 20×10 98.4 83.3 15.6 Bleeding, n=2; perforation, n=2; stent dysfunction, n=1; bacteremia, n=1; aspiration pneumonia, n=1 15.2
Chan et al. (2023)50 (EUS-GE vs. ES vs. SGJ) Two-center, retrospective 30 Malignant, n=30 EPASS, n=30 EC LAMS (Hot AXIOS) 15×10, 20×10 93.3 93.3 6.7 (2/30) Misdeployment, n=1; biliary obstruction, n=1 1
Monino et al. (2023)23 Multicenter, retrospective 71 Malignant, n=57; benign, n=14 Direct, n=30; nasojejunal draing, n=41 EC LAMS (Hot AXIOS) 20×10 85.9 (WEST, 95.1%; DTOG, 73.3%) 94.1 (WEST, 97.5; DTOG, 89.3%) 28.2 (WEST, 14.6%; DTOG, 46.7%) Misdeployment, n=8; abdominal pain, n=5; vomiting, n=2; delayed bleeding, n=1; peritonitis, n=3; infection, n=3; stent occlusion, n=2; perforation, n=1; LAMS migration, n=1; gastrocolonic–jejunal fistula, n=1; massive jejunalischemia, n=1 NA
Mangiavillano et al. (2023)35 Multicenter, retrospective 25 Malignant, n=22; benign, n=3 Nasobiliary, n=25 EC LAMS (Hot-Spaxus) 10×20, n=5; 16×20, n=20 100 68 0 0 NA
Rai et al. (2023)36 Single center, retrospective 30 Malignant, n=26; benign, n=4 Nasojejunal tube-assisted, n=30 EC LAMS (Hot AXIOS) 20×10 96.7 (29/30) 100 (29/29) 6.7 Bleeding, n=1; stent migration, n=1 NA
Kahaleh et al. (2024)44 International multicenter, retrospective 103 Malignant, n=72; benign, n=31 Direct, balloon-assisted, NEC LAMS (Axios), n=25; EC LAMS (Hot AXIOS), n=78 15×10, n=36; 20×10, n=67 82.5 (malignant, 83%; benign, 80.6%) 81.6 (malignant, 83%; benign, 77.4%) Immediate AE, 11.6% (malignant, 11%; benign, 13%); short-term AE, 19.4% (malignant, 15.2%; benign, 29%) Misdeployment, n=2; infection, n=5; abdominal pain, n=3; bacterial peritonitis, n=5; ascites infection, n=1; NA
USE-assisted, nasobiliary GI bleeding, n=2; retroperitoneal abscess, n=1; LAMS-related jejunal ulcer with bleeding, n=1; pneumoperitoneium, n=1; perforation, n=2; hypotension, n=2; secondary obstruction, n=2
On et al. (2023)24 Multicenter, retrospective 25 Malignant, n=22; benign, n=3 Direct, n=18; orojejunal tube, n=7 EC LAMS (Hot AXIOS), n=25 15×10, n=4; 20×10, n=21 92 (23/25) 100 (23/23) 8 Misdeployment, n=2 4.8

LAMS, Lumen-apposing metal stents; AE, adverse event; GOO, gastric outlet obstruction; NEC, non-electrocautery; EPASS, endoscopic ultrasound-guide double-balloon-occluded gastrojejunostomy bypass; EC, electrocautery; USE, ultraslim endoscope; NOTES, natural orifice transluminal endoscopic surgery; NA, not applicable; EUS-GE, endoscopic ultrasound-guided gastroenterostomy; ES: endoscopic stenting; SGJ, surgical gastrojejunostomy; WEST, wireless endoscopic simplified technique; DTOG, direct technique over a guidewire.

a)EC LAMS: A novel LAMS with an electrocautery tip was made by Micro-Tech Co., Ltd., Nanjing, China.

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        Endoscopic ultrasound-guided gastroenterostomy, with focus on technique and practical tips
        Clin Endosc. 2025;58(2):201-217.   Published online March 4, 2025
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      Endoscopic ultrasound-guided gastroenterostomy, with focus on technique and practical tips
      Image Image Image Image
      Fig. 1. (A) Upper gastrointestinal (UGI) series image shows the filling defect (tumor) is noted at the second portion of duodenum (type II gastric outlet obstruction). The direction and pattern of the proximal small intestine are visualized by the contrast media enhancement. (B) A 7-Fr nasobiliary catheter tube is inserted through the guidewire into the proximal jejunum. Saline and contrast media is infused through the nasobiliary drainage tube and the pattern of the small intestine is similar to that visualized by UGI series. (C) Abdominal computed tomography (CT) reveals the proximal jejunum goes to the right side after the small intestine passes through the ligament of Treitz. (D) The direction and pattern of the proximal jejunum is also similar with abdominal CT image.
      Fig. 2. Techniques of endoscopic ultrasound-guided gastroenterostomy (EUS-GE). (A) Direct technique. (B) Rendezvous guidewire technique. (C) Retrograde deployment technique. (D) Balloon-assisted technique. (E) Orojejunal catheter (nasobiliary drain, nasojejunal tube)-assisted technique. (F) Ultraslim endoscope assisted. (G) EUS-guided double balloon-occluded gastrojejunostomy bypass. LAMS, lumen-apposing self-expandable metal stent.
      Fig. 3. Steps of endoscopic ultrasound (EUS)-guided gastroenterostomy using nasobiliary drain assisted technique. (A) A 0.035-inch guidewire is passed into the proximal jejunum guided by large size of retrieval balloon. (B) Under endoscopic and fluoroscopic guidance, a 7-Fr nasobiliary catheter tube is inserted through the guidewire into the proximal jejunum. (C) Saline and contrast media are infused through the nasobiliary drainage tube to inflate the proximal enteric loops. (D) The saline-distended loops of the proximal small bowel are identified by using EUS. (E) EUS-guided puncture and successful deployment of lumen-apposing metal stents (LAMS). (F) The endoscopic view of the deployed LAMS is confirmed by visualizing blue-dyed water (methylene blue) infused through the nasobiliary drain.
      Fig. 4. Type I stent misdeployment. (A) A tent-like sign of the bowel wall (arrows) is visualized by endoscopic ultrasound (EUS) and it means that the EUS-guided puncture does not actually penetrate into the lumen of the small intestine. (B) The distal flange of the lumen-apposing metal stent opens in the peritoneum outside the small intestine.

      Fig. 1.

      Fig. 2.

      Fig. 3.

      Fig. 4.

      Endoscopic ultrasound-guided gastroenterostomy, with focus on technique and practical tips
      Malignant disease Benign disease
      Pancreatic cancer Peptic ulcer disease
      Bile duct cancer Acute pancreatitis
      Gallbladder cancer Chronic pancreatitis
      Ampulla of Vater cancer Caustic ingestion
      Gastric cancer Crohn’s disease
      Duodenal cancer Postendoscopic therapy
      Postradiotherapy
      Metastatic tumor or lymph nodes Superior mesenteric syndrome
      Miscellaneous
      LAMS Hot AXIOS Hot-Spaxus Z-EUS IT (Hanarostent Plumber) Novel LAMS Nagi Aixstent
      Manufacturer Boston Scientific; Natick, MA, USA Taewoong Medical; Gimpo, Korea M.I Tech; Pyeongtaek, Korea Micro-Tech Co., Ltd.; Nanjing, China Taewoong Medical; Gimpo, Korea Leufen Medical; Berlin, Germany
      Flange diameter (mm) 14, 17, 21, 24, 29 23, 25, 31 22, 24, 26, 28 20-26 20 25
      Length (mm) 8, 10, 15 20 Total length: 20, 30, 40 20 10, 20, 30 30
      Usable length: 13, 23, 33
      Length diameter (mm) 6, 8, 10, 15, 20 8, 10, 16 10, 12, 14, 16 12–16 10, 12, 14, 16 10, 15
      Delivery Catheter (Fr) 9, 10.8 10 10.5 9, 10.5 9, 10 10
      Electrocautery tip Yes Yes Yes Yes No No
      Study Type of study No. of sizes (n) Etiology Technique Type of LAMS Diameter of LAMS (mm) Technical success (%) Clinical success (%) AE (%) Detail of AEs Recurrent GOO (%)
      Khashab et al. (2015)14 Multicenter, retrospective 10 Malignant, n=3; benign, n=7 Direct, n=1; balloon-assisted, n=9 NEC LAMS (AXIOS) 15×10 90 90 0 0 0
      Itoi et al. (2016)46 Single center, prospective 20 Malignant, n=20 EPASS, n=20 EC LAMS (Hot AXIOS) 15×10 90 90 10 Misdeployment and pneumoperitoneium, n=2 0
      Tyberg et al. (2016)15 International multicenter, retrospective 26 Malignant, n=17; benign, n=9 Direct, n=3; balloon-assisted, n=13; nasobiliary drain, n=3; USE-assisted, n=5; NOTES, n=2 NEC LAMS, n= 17 15×10, n=25; 10×10, n=1 92 85 11.5 Peritonitis, n=1; bleeding, n=1; abdominal pain, n=1 0
      EC LAMS (Hot AXIOS), n= 9
      Chen et al. (2017)25 (EUS-GE vs. ES) International multicenter, retrospective 30 Malignant, n=30 Direct, n=2; balloon-assisted, n=6; EPASS, n=22 EC LAMS (Hot AXIOS), n=20; NEC LAMS (AXIOS), n=7; NECL LAMS (Spaxus), n=2 15×10 86.7 83.3 10 Misdeployment, n=3 4.3
      Perez-Miranda et al. (2017)26 (EUS-GE vs. SGJ) Multicenter, retrospective 25 Malignant, n=17; benign, n=8 Direct, n=6; balloon-assisted, n=9; USE-assisted, n=7; nasobiliary drain, n=3 EC LAMS (Hot AXIOS), NEC LAMS (AXIOS) NA 88 84 12 Bleeding, n=2; peritonitis, n=1 0
      Khashab et al. (2017)27 (EUS-GE vs. SGJ) International multicenter, retrospective 30 Malignant, n=30 Direct, n=2; balloon-assisted, n=6; EPASS, n=22 EC LAMS (Hot AXIOS), n=21; NEC LAMS (AXIOS), n=7; NEC LAMS (Spaxus), n=2 NA 87 87 16 Misdeploymenet, n=3; abdominal pain, n=2 3
      Chen et al. (2018)16 International multicenter, retrospective 26 Benign, n=26 Direct, n=15; balloon-assisted, n=7; EPASS, n=4 NEC LAMS, n=2; EC LAMS (Hot AXIOS), n=24 15×10 96 84 11.5 Misdeployment, n=2; gastric leakage, n=1 4.8
      Chen et al. (2018)17 Multicenter, retrospective 74 Malignant, n=49; benign, n=25 Direct, n=52; balloon-assisted, n=22 NEC LAMS, n=14; EC LAMS (Hot AXIOS), n=59 15×10 93.2 (direct, 94.2%; balloon-assisted, 90.9%) 91.9 (direct: 92.3%; balloon-assisted, 90.9%) 6.8 (direct: 5.8%; balloon-assisted, 9.1%) Misdeployment, n=5 9.5
      Ge et al. (2019)28 (EUS-GE vs. ES) Single center, retrospective 22 Malignant, n=22 Direct, n=22 EC LAMS (Hot AXIOS) 15×10 100 96 18.1 Misdeployment, n=2; LAMS mesh erosion, n=1; stent ingrowth, n=1 4.5
      Kerdsirichairat et al. (2019)18 Single center, retrospective 57 Malignant, n=34; benign, n=23 Direct, n=57 EC LAMS (Hot AXIOS) 15×10 92.9 89.5 3.5 Leakage, n=1; hemoperitoneium, n=1 15.1
      James et al. (2020)19 Single center, retrospective 22 Benign, n=22 Direct, n=9; balloon-assisted, n=8; orojejunal, n=5 NEC LAMS, EC LAMS (Hot AXIOS) 15×10, n=16; 20×10, n=5 95.4 NA 19 Abdominal pain, n=1; bleeding, n=1; stent migration, n=1; necrotizing pancreatitis, n=1 23.8
      Kastelijn et al. (2020)29 International multicenter, retrospective 45 Malignant, n=45 Direct, n=36; balloon-assisted, n=9 EC LAMS (Hot AXIOS) 15×10, n=32; 20×10, n=12 86.7 73.3 26.7 Misdeploymenet, n=5; infection, n=6; stent dislocation, n=1 6.1
      Xu et al. (2020)49 Single center, retrospective 36 Malignant, n=36 EPASS, n=36 EC LAMSa) NA 100 94.4 25 Misdeploymenet, n=1; bleeding, n=2; metal stent cutting the guidewire, n=3; stent migration, n=2; peritonitis, n=3; delayed bleeding, n=2 2.7
      Wannhoff et al. (2021)20 Single center, retrospective 35 Malignant, n=33; benign, n=2 Direct, n=22; nasobiliary, n=10; others, n=2 NEC LAMS (Spaxus; HANARO), EC LAMS (Hot AXIOS) Hot AXIOS, n=31; 10×10, n=1; 15×10, n=18; 20×10, n=12; Niti-S Spaxus, 16×20, n=2; HANARO, 16×40, n=1 80 74.3 14.3 Peritonitis, n=3; perforation, n=1; misdeployment, n=1 NA
      Bronswijk et al. (2021)37 (EUS-GE vs. SGJ) International multicenter, retrospective 77 Malignant, n=74; benign, n=3 Nasobiliary, n=77 EC LAMS (Hot AXIOS) NA 94.8 92.2 6.5 Misdeployment, n=2; fever, n=2; sepsis, n=1 0
      Havre et al. (2021)38 Single center, retrospective 33 Malignant, n=28; benign, n=5 Nasobiliary, n=33 EC LAMS (Hot AXIOS) 15×10, n=22; 20×10, n=7 100 0.91 30 Stent migration, n=3; bleeding, n=2; pneumonia, n=3; refeeding syndrome, n=1; more puncture, n=1 0
      Jovani et al. (2021)21 Single center, retrospective 73 Malignant, n=64; benign, n=9 Direct, n=73 EC LAMS (Hot AXIOS) 15×10, n=64; 20×10, n=4 93 (68/73) 97 (66/68) 7.4 Misdeployment, n=3; hemoperitoneium, n=1; stent migration, n=1 15
      Sobani et al. (2021)31 Single center, retrospective 31 Malignant, n=23; benign, n=8 Balloon-assisted, n=31 EC LAMS (Hot AXIOS) 20×10 100 93.5 3.2 Bleeding, n=1 0
      Basha et al. (2021)33 Single center, retrospective 31 Malignant, n=29; benign, n=2 EPASS, n=27; nasobiliary, n=4 EC LAMS (Hot AXIOS) 15×10, 20×10 90.3 (ascites, 91.6%; without ascites, 89.4%) 87.1 (ascites, 83.3%; without ascites, 89.4%) 6.4 (ascites, 0%; without ascites, 10.5%) Colonic perforation, n=1; bleeding, n=1 NA
      Nguyen et al. (2021)34 Single center, retrospective 42 Malignant, n=35; benign, n=7 oroenteric catheter-assisted EC LAMS (Hot AXIOS) 15×10 98 93 7 Misdeployment, n=1; stent occlusion, n=2 NA
      Bejjani et al. (2022)22 International multicenter, retrospective 267 Malignant, n=267 Direct, balloon-assisted EC LAMS (Hot AXIOS) 15×10, n=148; 20×10, n=119 95.5 (15-mm LAMS, 96%; 20-mm LAMS, 95%) 87 (15-mm LAMS, 89.2%; 20-mm LAMS, 84.1%) 12.4 (15-mm LAMS, 12.8%; 20-mm LAMS, 11.8%) Misdeployment, n=23; aspiration pneumonia, n=3; small-bowl perforation, n=2; shock/bacteremia, n=2; peritonitis, n=1; others, n=2 1.9 (5/267)
      Abbas et al. (2022)45 Single center, prospective 50 Malignant, n=50 USE-assisted EC LAMS (Hot AXIOS) 15×10, 20×10 100 92 4 LAMS dislodgement, n=1; gastro-colonic fistula, n=1 16
      Sánchez-Aldehuelo et al. (2022)39 (EUS-GE vs. ES) Multicenter, retrospective 79 Malignant, n=79 Nasobiliary, n=79 EC LAMS (Hot AXIOS) 15×10, 20×10 93.7 92.4 10.1 Misdeployment, n=3; bleeding, n=2; perforation, n=1; severe pain, n=1; aspiration, n=1 2.5 (2/79)
      Fischer et al. (2022)40 Two-center, retrospective 45 Malignant, n=39; benign, n=4; unclear, n=2 USE-assisted, n=18; nasobiliary, n=27 EC LAMS (Hot AXIOS) 10×10, n=1; 15×10, n=14; 20×10, n=30 98 95 24 Stent misplacement, n=7; bleeding, n=2; leakage, n=1; gastrojejunocolic fistula, n=1 18
      Choi et al. (2022)41 Single center, retrospective 52 Malignant, n=41; benign, n=11 Endoscope-assisted nasobiliary NEC LAMS (AXIOS), n=6; EC LAMS (Hot AXIOS), n=46 10×10, n=3; 15×10, n=47; 20×10, n=1 92.3 80.8 26.9 Misdeployment, n=7; pneumoperitoneium, n=2; migration, n=1; miscellaneous, n=4 17.3
      Mahmoud et al. (2022)30 Single center, retrospective 55 Malignant, n=55 Direct, n=7; dual scope assisted, n=10; balloon-assisted, n=8; nasobiliary, n=30 NEC LAMS (AXIOS), n=1; EC LAMS (Hot AXIOS), n=54 NA 94.8 (55/58) 91.7 (51/55) (ascites, 91.7%; without ascites, 93.5%) 27.2 (15/55) (ascites, 37.5%; without ascites, 19.4%) Misdeployment, n=5; stent migration, n=1; abdominal pain, n=5; DVT, n=1; tissue ingrowth, n=1; cholangitis, n=1; peritonitis, n=2; sepsis, n=2 3.6
      Perez-Cuadrado-Robles et al. (2022)42 Single center, retrospective 28 Malignant, n=28 Oroenteric catheter-assisted EC LAMS (Hot AXIOS) 20×10 89.3 88 7.1 Gastrocolic fistula, n=1; colonic perforation, n=1 18.2
      van Wanrooij et al. (2022)32 (EUS-GE vs. ES) International multicenter, retrospective 107 Malignant, n=107 Nasobiliary EC LAMS (Hot AXIOS) 15×10, 20×10 94 91 10.2 Misdeployment, n=3; aspiration pneumonia, n=1; cholangits, n=3; bleeding, n=1 1
      Garcia-Alonso et al. (2023)43 Multicenter, prospective 64 Malignant, n=64 Nasobiliary EC LAMS (Hot AXIOS) 15×10, 20×10 98.4 83.3 15.6 Bleeding, n=2; perforation, n=2; stent dysfunction, n=1; bacteremia, n=1; aspiration pneumonia, n=1 15.2
      Chan et al. (2023)50 (EUS-GE vs. ES vs. SGJ) Two-center, retrospective 30 Malignant, n=30 EPASS, n=30 EC LAMS (Hot AXIOS) 15×10, 20×10 93.3 93.3 6.7 (2/30) Misdeployment, n=1; biliary obstruction, n=1 1
      Monino et al. (2023)23 Multicenter, retrospective 71 Malignant, n=57; benign, n=14 Direct, n=30; nasojejunal draing, n=41 EC LAMS (Hot AXIOS) 20×10 85.9 (WEST, 95.1%; DTOG, 73.3%) 94.1 (WEST, 97.5; DTOG, 89.3%) 28.2 (WEST, 14.6%; DTOG, 46.7%) Misdeployment, n=8; abdominal pain, n=5; vomiting, n=2; delayed bleeding, n=1; peritonitis, n=3; infection, n=3; stent occlusion, n=2; perforation, n=1; LAMS migration, n=1; gastrocolonic–jejunal fistula, n=1; massive jejunalischemia, n=1 NA
      Mangiavillano et al. (2023)35 Multicenter, retrospective 25 Malignant, n=22; benign, n=3 Nasobiliary, n=25 EC LAMS (Hot-Spaxus) 10×20, n=5; 16×20, n=20 100 68 0 0 NA
      Rai et al. (2023)36 Single center, retrospective 30 Malignant, n=26; benign, n=4 Nasojejunal tube-assisted, n=30 EC LAMS (Hot AXIOS) 20×10 96.7 (29/30) 100 (29/29) 6.7 Bleeding, n=1; stent migration, n=1 NA
      Kahaleh et al. (2024)44 International multicenter, retrospective 103 Malignant, n=72; benign, n=31 Direct, balloon-assisted, NEC LAMS (Axios), n=25; EC LAMS (Hot AXIOS), n=78 15×10, n=36; 20×10, n=67 82.5 (malignant, 83%; benign, 80.6%) 81.6 (malignant, 83%; benign, 77.4%) Immediate AE, 11.6% (malignant, 11%; benign, 13%); short-term AE, 19.4% (malignant, 15.2%; benign, 29%) Misdeployment, n=2; infection, n=5; abdominal pain, n=3; bacterial peritonitis, n=5; ascites infection, n=1; NA
      USE-assisted, nasobiliary GI bleeding, n=2; retroperitoneal abscess, n=1; LAMS-related jejunal ulcer with bleeding, n=1; pneumoperitoneium, n=1; perforation, n=2; hypotension, n=2; secondary obstruction, n=2
      On et al. (2023)24 Multicenter, retrospective 25 Malignant, n=22; benign, n=3 Direct, n=18; orojejunal tube, n=7 EC LAMS (Hot AXIOS), n=25 15×10, n=4; 20×10, n=21 92 (23/25) 100 (23/23) 8 Misdeployment, n=2 4.8
      Table 1. Etiology of gastric outlet obstruction

      Table 2. Type of lumen-apposing metal stents

      LAMS, lumen-apposing metal stent.

      Table 3. Outcome of endoscopic ultrasound-guided gastroenterstomy

      LAMS, Lumen-apposing metal stents; AE, adverse event; GOO, gastric outlet obstruction; NEC, non-electrocautery; EPASS, endoscopic ultrasound-guide double-balloon-occluded gastrojejunostomy bypass; EC, electrocautery; USE, ultraslim endoscope; NOTES, natural orifice transluminal endoscopic surgery; NA, not applicable; EUS-GE, endoscopic ultrasound-guided gastroenterostomy; ES: endoscopic stenting; SGJ, surgical gastrojejunostomy; WEST, wireless endoscopic simplified technique; DTOG, direct technique over a guidewire.

      EC LAMS: A novel LAMS with an electrocautery tip was made by Micro-Tech Co., Ltd., Nanjing, China.

      Table 1.

      Table 2.

      Table 3.

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