Endoscopic suture fixation of gastrointestinal stents: proof of biomechanical principles and early clinical experience

The Use of Esophageal Stents in the Management of Postoperative Fistulas-Current Status, Clinical Outcomes and Perspectives-Review

Esophageal fistula remains one of the main postoperative complications, with the treatment often requiring the use of stents. This article reviews the updates on the use of endoscopic stents for the treatment of postoperative esophageal leakage in terms of indications, types of stents used, efficiency, specific complications and perspectives.

MATERIALS AND METHODS

We searched the PubMed and MEDLINE databases for the keywords postoperative esophageal anastomotic leak and postoperative esophageal anastomotic leak stent, and retrieved relevant papers published until December 2022.

RESULTS

The endoscopic discovery of the fistula is usually followed by the insertion of a fully covered esophageal stent. It has an efficiency of more than 60% in closing the fistula, and the failure is related to the delayed application of the method, a situation more suitable for endo vac therapy. The most common complication is migration, but life-threatening complications have also been described. The combination of the advantages of endoscopic stents and vacuum therapy is probably found in the emerging VACstent procedure.

CONCLUSIONS

Although the competing approaches give promising results, this method has a well-defined place in the treatment of esophageal fistulas, and it is probably necessary to refine the indications for each individual procedure.

Acute upper gastrointestinal bleeding: A stitch on time saves nine

Upper gastrointestinal bleeding is common and often needs timely intervention for optimal outcomes. Esophageal bleeding may occur due to local advancement of malignancy or bleeding from an arterio-oesophageal fistula. We discuss the management options available for such cases.

A Comprehensive Review of Endoscopic Management of Sleeve Gastrectomy Leaks

BACKGROUND

Bariatric surgery leaks result in significant morbidity and mortality. Experts report variable therapeutic approaches, without uniform guidelines or consensus.

OBJECTIVE

To review the pathogenesis, risk factors, prevention, and treatment of gastric sleeve leaks, with a focus on endoscopic approaches. In addition, the efficacy and success rates of different treatment modalities are assessed.

DESIGN

A comprehensive review was conducted using a thorough literature search of 5 online electronic databases (PubMed, PubMed Central, Cochrane, EMBASE, and Web of Science) from the time of their inception through March 2020. Studies evaluating gastric sleeve leaks were included. MeSH terms related to "endoscopic," "leak," "sleeve," "gastrectomy," "anastomotic," and "bariatric" were applied to a highly sensitive search strategy. The main outcomes were epidemiology, pathophysiology, diagnosis, treatment, and outcomes.

RESULTS

Literature search yielded 2418 studies of which 438 were incorporated into the review. Shock and peritonitis necessitate early surgical intervention for leaks. Endoscopic therapies in acute and early leaks involve modalities with a focus on one of: (i) defect closure, (ii) wall diversion, or (iii) wall exclusion. Surgical revision is required if endoscopic therapies fail to control leaks after 6 months. Chronic leaks require one or more endoscopic, radiologic, or surgical approaches for fluid collection drainage to facilitate adequate healing. Success rates depend on provider and center expertise.

CONCLUSION

Endoscopic management of leaks post sleeve gastrectomy is a minimally invasive and effective alternative to surgery. Their effect may vary based on clinical presentation, timing or leak morphology, and should be tailored to the appropriate endoscopic modality of treatment.

Endoscopic ultrasound-guided luminal remodeling as a novel technique to restore gastroduodenal continuity

Pyloric exclusion is a method of treatment for duodenal injury. Surgery is usually needed to restore digestive continuity in due time, yet a new surgical procedure can be challenging due to fibrotic adhesion development. We present here a retrospective case series of three patients with pyloric exclusion who underwent endoscopic ultrasound–guided duodenal repermeabilization using metallic stents. All procedures were successful with no complication and allowed regular feeding. This case series shows that endoscopic ultrasound–guided recanalization is a feasible and safe procedure.

Safety and Efficacy of Endoscopically Secured Fully Covered Self-Expandable Metallic Stents (FCSEMS) for Post-Bariatric Complex Stenosis

BACKGROUND

The use of fully covered self-expandable metallic stents (FCSEMS) has opened the door to treat stenosis in the post-bariatric stomach. We hypothesized that endoscopically securing a FCSEMS would be technically feasible, effective, and safe for > 30-day dwell time.

OBJECTIVES

To assess the technical feasibility, clinical efficacy, and safety of endoscopically secured FCSEMS in the stomach for > 30 days.

METHODS

A retrospective review (September 2016 to April 2018) of consecutive patients who underwent FCSEMS suturing in the stomach at a single academic institution was reviewed. Technical success, stent dwell time, symptoms, and adverse events were recorded.

RESULTS

Fifteen patients (median age of 49 (31-70)) were included. Stents were inserted for gastrojejunal (GJ) stricture or gastric stenosis in 9/15 and 6/15 of patients, respectively. All procedures were technically successful (100%). Immediate and short-term clinical success (prior to stent removal) was 100% in patients who did not have stent migration. Stent migration was seen in 3 cases (20%) after a median dwell time of 211 days. However, 2/3 (66.6%) had not attended their scheduled removal. Recurrence of symptoms after stent removal was seen in 53.3% of patients with 40% undergoing repeat stenting. Median stent dwell was 117 (30-342) days. Sixty percent and 33% of patients had stent dwell of at least 90 and 180 days, respectively.

CONCLUSIONS

A FCSEMS, if secured, may be safe and effective for even > 90-day dwell time in the post-bariatric stomach and may result in long-term clinical success for GJ stricture after stent removal.

The Development of the Overstitch System and Its Potentials

Endoscopic suturing device for flexible endoscopy was conceptualized by Apollo Group in collaboration with Olympus Optical Ltd. The first modification of suturing device for flexible endoscopy (Eagle Claw) was manufactured by Olympus engineers and extensively used by members of Apollo Group in numerous bench-top experiments on isolated pig stomachs and in live porcine model. The suturing system for flexible endoscopy in humans (Overstitch) was cleared for general clinical use in the United States in 2008. The latest model is compatible with more than 20 single-channel flexible endoscopes with diameters ranging from 8.8 mm to 9.8 mm made by major endoscope manufacturers.

Mechanical characterizations of braided composite stents made of helical polyethylene terephthalate strips and NiTi wires

The novel braided composite stent (BCS), woven with both nitinol wires and polyethylene terephthalate (PET) strips, were characterized and compared with the braided nitinol stent in the same weaving pattern. Finite element models simulating the stent compression and bending were developed to quantify its radial strength and longitudinal flexibility. The interaction between the nitinol wires and the PET strips were also delineated. Results showed that the PET strips enforced more constrains on the BCS and thus enhance its radial strength especially at a larger compression load. The longitudinal flexibility of the BCS was less sensitive to the presence of the PET strips. This work suggested that the novel design of the BCS could acquire the advantage of a covered stent without compromising its mechanical performance. The fundamental understanding of the braided composite stent will facilitate a better device design.

Closing the Gaps: Endoscopic Suturing for Large Submucosal and Full-Thickness Defects

This article is a systematic review of relevant literature on endoscopic suturing as a primary closure technique for large submucosal and full-thickness defects after endoscopic mucosal resection (EMR), endoscopic submucosal dissection (ESD), and endoscopic full-thickness resection (EFTR). A comprehensive literature search was conducted through 2016 by using PubMed, to find peer-reviewed original articles. The specific factors considered were the procedural indications and details, success rates, clinical outcomes including complications, and study limitations. Six original articles were included in the final review: two with non-human subjects and four with human subjects. The mean success rate of endoscopic suturing was 97.4% (100% for human subjects and 95.4% for non-human subjects). The procedural time ranged from 7 to 89 min. The average size and depth of lesions were 2.71 cm (3.74 cm [human] and 1.96 cm [non-human]) and 1.52 cm, respectively. The technique itself had no reported impact on mortality. In conclusion, endoscopic suturing is a minimally invasive technique for the primary closure of defects caused by EMR, ESD, and EFTR, with a high success and low complication rate.

Fully-covered metal stents with endoscopic suturing vs. partially-covered metal stents for benign upper gastrointestinal diseases: a comparative study

BACKGROUND AND STUDY AIMS

Self-expandable metallic stents (SEMS) have been increasingly used in benign conditions (e. g. strictures, fistulas, leaks, and perforations). Fully covered SEMS (FSEMS) were introduced to avoid undesirable consequences of partially covered SEMS (PSEMS), but come with higher risk of stent migration. Endoscopic suturing (ES) for stent fixation has been shown to reduce migration of FSEMS. Our aim was to compare the outcomes of FSEMS with ES (FS/ES) versus PSEMS in patients with benign upper gastrointestinal conditions.

PATIENTS AND METHODS

We retrospectively identified all patients who underwent stent placement for benign gastrointestinal conditions at seven US tertiary-care centers. Patients were divided into two groups: FSEMS with ES (FS/ES group) and PSEMS (PSEMS group). Clinical outcomes between the two groups were compared.

RESULTS

A total of 74 (FS/ES 46, PSEMS 28) patients were included. On multivariable analysis, there was no significant difference in rate of stent migration between FS/ES (43 %) and PSEMS (15 %) (adjusted odds ratio 0.56; 95 % CI 0.15 - 2.00). Clinical success was similar [68 % vs. 64 %; P  = 0.81]. Rate of adverse events (AEs) was higher in PSEMS group [13 (46 %) vs. 10 (21 %); P  = 0.03). Difficult stent removal was higher in the PSEMS group (n = 5;17 %) vs. 0 % in the FS/ES group; P  = 0.005.

CONCLUSIONS

The proportion of stent migration of FS/ES and PSEMS are similar. Rates of other stent-related AEs were higher in the PSEMS group. PSEMS was associated with tissue ingrowth or overgrowth leading to difficult stent removal, and secondary stricture formation. Thus, FSEMS with ES for stent fixation may be the preferred modality over PSEMS for the treatment of benign upper gastrointestinal conditions.

Double Pigtail Stent Insertion for Healing of Leaks Following Roux-en-Y Gastric Bypass. Our Experience (with Videos)

BACKGROUND

Roux-en-Y gastric bypass (RYGB) is complicated by a leak in 0-4.3% of cases. Treatment by fully covered stents has been reported to be associated with some life-threatening complications. We report our experience of insertion of double pigtail stents.

METHODS

Thirty-three patients (20M, 43 years-20/65), presenting with a leak at an average of 10 days after RYGB (4-35), were treated by double pigtail stent insertion and a nasojejunal feeding tube. Sixty percent of these patients had undergone surgical drainage prior to stenting for control of sepsis. Thirty leaks were located at the top of staple line and three at the gastro-jejunal anastomosis. At a 4-weekly follow-up, ablation or re-stenting was performed depending on status of fistula closure and patients were placed on normal diet.

RESULTS

At the first follow-up, 10/33 fistulae healed, one patient presented with clinical failure (3%) and needed surgery, and 22/33were re-stented. Twenty-one out of these 22 developed a secondary sub-clinical gastro-gastric fistula and one, instead, developed complex (gastro-gastric, gastro-colic) fistula. All (22) primary fistulae healed following four more weeks of treatment. Average treatment duration was of 61 days (28-99). Thirty-two patients (97%) at a follow-up of 1-33 months are asymptomatic.

CONCLUSIONS

Leaks following RYGB can be successfully and safely managed by double pigtail stents. Upper gastric staple line leaks are responsible for the formation of a secondary sub-clinic gastro-gastric fistula which needs no additional treatment.

Endoscopic suturing of esophageal fully covered self-expanding metal stents reduces rates of stent migration

BACKGROUND AND AIMS

Endoscopic suturing of fully covered self-expanding metal stents (FC-SEMSs) may prevent migration. The aim of this study was to compare rates of migration between sutured FC-SEMSs (S-FCSEMSs), unsecured FC-SEMSs, and partially covered SEMSs (PC-SEMSs) placed for benign esophageal leaks and strictures.

METHODS

In a retrospective, single-center, cohort study, rates of migration for S-FCSEMSs, FC-SEMSs, and PC-SEMSs were assessed in patients with at least 1 month of follow-up or experiencing clinically significant stent migration (CSSM) any time after placement. CSSM was defined as proximal or distal displacement of the stent by ≥2 cm or passage into the stomach plus the recurrence of pre-SEMS symptoms or signs. A multivariable analysis was done to identify additional risk factors for stent migration.

RESULTS

A total of 184 SEMSs were placed in 101 patients, including 32 S-FCSEMSs in 25 patients, 114 FC-SEMSs in 59 patients, and 38 PC-SEMSs in 30 patients. CSSM occurred with 56 of 184 stents (30.4%) in 36 of 101 patients (35.6%), including 3 of 32 (9.4%) S-FCSEMSs, 45 of 114 (39.5%) FC-SEMSs, and 8 of 38 (21.1%) PC-SEMSs (P = .005). Migration was less likely for S-FCSEMSs than for FC-SEMSs (9.4% vs 39.5%; P = .01) but not between S-FCSEMSs and PC-SEMSs (9.4% vs 21.1%; P = .07) or between FC-SEMSs and PC-SEMSs (39.5% vs 21.1%; P = .38). Previous stent migration (odds ratio [OR], 3.93; 95% confidence interval [CI], 1.88-8.19; P = .01) and previous esophageal surgery (OR, 0.33; 95% CI, 0.16-0.67; P = .002) were associated with increased and decreased risk of CSSM, respectively.

CONCLUSIONS

Endoscopic suturing of FC-SEMSs for benign esophageal disease reduces CSSM compared with unsecured FC-SEMSs but not PC-SEMSs. Patients with previous stent migration may benefit from prophylactic suturing of FC-SEMSs.

Stent migration following endoscopic suture fixation of esophageal self-expandable metal stents: a systematic review and meta-analysis

BACKGROUND

Covered self-expandable metal stents (SEMS) are utilized for the management of benign and malignant esophageal conditions; however, covered SEMS are prone to migration. Endoscopic suture fixation may mitigate the migration risk of covered esophageal SEMS. Hence, we conducted a systematic review and meta-analysis to evaluate the effectiveness and safety of endoscopic suture fixation for covered esophageal SEMS.

METHODS

Following PRISMA guidelines, we performed a systematic review from 2011 to 2016 to identify studies (case control/case series) reporting the technical success and migration rate of covered esophageal SEMS following endoscopic suture fixation. We searched multiple electronic databases and conference proceedings. We calculated pooled rates (and 95% confidence intervals [CI]) of technical success and stent migration using a random effects model.

RESULTS

We identified 14 studies (212 patients) describing covered esophageal SEMS placement with endoscopic suture fixation. When reported, SEMS indications included leak/fistula (n = 75), stricture (n = 65), perforation (n = 10), and achalasia (n = 4). The pooled technical success rate was 96.7% (95% CI 92.3-98.6), without heterogeneity (I ² = 0%). We identified 29 SEMS migrations at rate of 15.9% (95% CI 11.4-21.6), without heterogeneity (I ² = 0%). Publication bias was observed, and using the trim-and-fill method, a more conservative estimate for stent migration was 17.0%. Suture-related adverse events were estimated to occur in 3.7% (95% CI 1.6-8.2) of cases.

CONCLUSIONS

Endoscopic suture fixation of covered esophageal SEMS appears to reduce stent migration when compared to published rates of non-anchored SEMS. However, SEMS migration still occurs in approximately 1 out of 6 cases despite excellent immediate technical success and low risk of suture-related adverse events.

Predictive Factors for the Migration of Endoscopic Self-Expanding Metal Stents Placed in the Foregut

BACKGROUND

With recent advancements in endoscopy, self-expandable metal stents (SEMS) have been used to treat gastrointestinal leaks, perforations, and strictures. Stent migration frequently complicates management and often requires additional treatments to reach resolution. Our study aimed to determine predictive factors for stent migration.

METHODS

Consecutive procedures involving SEMS placed with and without fixation after upper gastrointestinal surgery between 2009 and 2014 were retrospectively reviewed. Demographic, surgical history, rate of stent migration, and stent characteristic data were collected. Rates of stent migration were compared.

RESULTS

We reviewed 214 consecutive procedures involving stents placed in the foregut. Median duration of stent placement was 4.0 ± 10.3 weeks. Forty-three (20%) stents migrated after placement. Of those, 27 (63%) required stent replacement. Eleven (5%) procedures utilized stent fixation and 203 (95%) did not. Fixation techniques included endoscopic clips (9%), endoscopic sutures (73%), and transnasal sutures (18%). Stent migration rate was not different between those with and those without fixation ( P = .2). Rate of migration was significantly higher in procedures involving fully covered stents ( P < .001). Migration occurred after esophagectomy and gastric bypass ( P < .001 and P < .05, respectively) and in patients with diabetes ( P < .01).

CONCLUSIONS

A challenge with SEMS use is stent migration. Diabetes and using fully covered stents were associated with migration as were SEMS used to treat complications of esophagectomy and gastric bypass. Stent fixation was not associated with the prevention of stent migration. No pattern was found that favors an approach to reduce stent migration.

Endoscopic stent suture fixation for prevention of esophageal stent migration during prolonged dilatation for achalasia treatment

The aim of this study is to compare endoscopic stent suture fixation with endoscopic clip attachment or the use of partially covered stents (PCS) regarding their capability to prevent stent migration during prolonged dilatation in achalasia. Large-diameter self-expanding metal stents (30 mm × 80 mm) were placed across the gastroesophageal junction in 11 patients with achalasia. Stent removal was scheduled after 4 to 7 days. To prevent stent dislocation, endoscopic clip attachment, endoscopic stent suture fixation, or PCS were used. The Eckardt score was evaluated before and 6 months after prolonged dilatation. After endoscopic stent suture fixation, no (0/4) sutured stent migrated. When endoscopic clips were used, 80% (4/5) clipped stents migrated (p = 0.02). Of two PCS (n = 2), one migrated and one became embedded leading to difficult stent removal. Technical adverse events were not seen in endoscopic stent suture fixation but were significantly correlated with the use of clips or PCS (r = 0.828, p = 0.02). Overall, 72% of patients were in remission regarding their achalasia symptoms 6 months after prolonged dilatation. Endoscopic suture fixation of esophageal stents but not clip attachment appears to be the best method of preventing early migration of esophageal stents placed at difficult locations such as at the naive gastroesophageal junction.

Endoscopic management of post-bariatric surgery complications

Understanding the technical constructs of bariatric surgery is important to the treating endoscopist to maximize effective endoluminal therapy. Post-operative complication rates vary widely based on the complication of interest, and have been reported to be as high as 68% following adjustable gastric banding. Similarly, there is a wide range of presenting symptoms for post-operative bariatric complications, including abdominal pain, nausea and vomiting, dysphagia, gastrointestinal hemorrhage, and weight regain, all of which may provoke an endoscopic assessment. Bleeding and anastomotic leak are considered to be early (< 30 d) complications, whereas strictures, marginal ulcers, band erosions, and weight loss failure or weight recidivism are typically considered late (> 30 d) complications. Treatment of complications in the immediate post-operative period may require unique considerations. Endoluminal therapies serve as adjuncts to surgical and radiographic procedures. This review aims to summarize the spectrum and efficacy of endoscopic management of post-operative bariatric complications.

Endoscopic management of colonic perforations: clips versus suturing closure (with videos)

BACKGROUND AND AIMS

Perforation during colonoscopy remains the most worrisome adverse event and usually requires urgent surgical rescue. The aim of this study was to evaluate the feasibility and effectiveness of endoscopic closure of full-thickness colonic perforations.

METHODS

We performed a retrospective analysis of all consecutive patients with endoscopically closed colonic perforations over the past 6 years (2009-2014). Colonic perforations were closed by using endoscopic clips or an endoscopic suturing device. Most patients were admitted for treatment with intravenous antibiotics and kept on bowel rest. If their clinical condition deteriorated, urgent surgery was performed. If patients remained stable, oral feeding was resumed, and patients were discharged with subsequent clinical and endoscopic follow-up.

RESULTS

Twenty-one patients had iatrogenic colonic perforations closed with an endoscopic suturing device or endoscopic clips during the study period. Primary closure of a colonic perforation was performed with endoscopic clips in 5 patients and sutured with an endoscopic suturing device in 16 patients. All 5 patients after clip closure had worsening of abdominal pain and required laparoscopy (4 patients) or rescue colonoscopy with endoscopic suturing closure (1 patient). Two patients had abdominal pain after endoscopic suturing closure, but diagnostic laparoscopy confirmed complete and adequate endoscopic closure of the perforations. The other 15 patients did not require any rescue surgery or laparoscopy after endoscopic suturing. The main limitation of our study is its retrospective, single-center design and relatively small number of patients.

CONCLUSION

Endoscopic suturing closure of colonic perforations is technically feasible, eliminates the need for rescue surgery, and appears more effective than closure with hemostatic endoscopic clips.

Safety and efficacy of a fully covered large-diameter self-expanding metal stent for the treatment of upper gastrointestinal perforations, anastomotic leaks, and fistula

Upper gastrointestinal perforations, fistula, and anastomotic leaks are severe conditions with high mortality. Temporary endoscopic placement of fully covered self-expanding metal stent (fSEMS) has emerged as treatment option. Stent migration is a major drawback of currently used stents. Migration is often attributed to a relatively too small stent diameter as esophageal stents were initially intended for the treatment of strictures. This study aimed to investigate the safety and efficacy of a large-diameter fSEMS for treatment of these conditions. Data were retrospectively collected from patients who received this stent in the Netherlands between March 2011 and August 2013. Clinical success was defined as sufficient leak closure after stent removal as confirmed by endoscopy or X-ray with oral contrast without surgical intervention or placement of another type of stent. Adverse events were graded according a standardized grading system. Stent placement was performed in 34 patients for the following indications: perforation (n = 6), anastomotic leak (n = 26), and fistula (n = 2). Technical success rate was 97% (33/34). Clinical success rate was 44% (15/34) after one stent and 50% (17/34) after an additional stent. There were no severe adverse events and stent-related mortality. The overall adverse event rate was 50% (all graded 'moderate'). There were 14 (41%) stent migrations (complete n = 8, partial n = 6). Other adverse events were bleeding (n = 2) and aspiration pneumonia (n = 1). Reinterventions for failure of the large-diameter fSEMS were placement of another type of fSEMS (n = 4), surgical repair (n = 3), or esophagectomy (n = 1). Eleven patients (32%) died in-hospital because of persisting intrathoracic sepsis (n = 10) or preexistent bowel ischemia (n = 1). This study suggests that temporary placement of a large-diameter fSEMS for the treatment of upper gastrointestinal perforations, fistula, and anastomotic leaks is safe in terms of severe adverse events and stent-related mortality. The larger diameter does not seem to prevent stent migration.

A Large Multicenter Experience With Endoscopic Suturing for Management of Gastrointestinal Defects and Stent Anchorage in 122 Patients: A Retrospective Review

GOALS

To describe a multicenter experience using an endoscopic suturing device for management of gastrointestinal (GI) defects and stent anchorage.

BACKGROUND

Endoscopic closure of GI defects including perforations, fistulas, and anastomotic leaks as well as stent anchorage has improved with technological advances. An endoscopic suturing device (OverStitch; Apollo Endosurgery Inc.) has been used.

STUDY

Retrospective study of consecutive patients who underwent endoscopic suturing for management of GI defects and/or stent anchorage were enrolled between March 2012 and January 2014 at multiple academic medical centers. Data regarding demographic information and outcomes including long-term success were collected.

RESULTS

One hundred and twenty-two patients (mean age, 52.6 y; 64.2% females) underwent endoscopic suturing at 8 centers for stent anchorage (n=47; 38.5%), fistulas (n=40; 32.7%), leaks (n=15; 12.3%), and perforations (n=20; 16.4%). A total of 44.2% underwent prior therapy and 97.5% achieved technical success. Immediate clinical success was achieved in 79.5%. Long-term clinical success was noted in 78.8% with mean follow-up of 68 days. Clinical success was 91.4% in stent anchorage, 93% in perforations, 80% in fistulas, but only 27% in anastomotic leak closure.

CONCLUSIONS

Endoscopic suturing for management of GI defects and stent anchoring is safe and efficacious. Stent migration after stent anchoring was reduced compared with published data. Long-term success without further intervention was achieved in the majority of patients. The role of endoscopic suturing for repair of anastomotic leaks remains unclear given limited success in this retrospective study.

Update on Enteral Stents

OPINION STATEMENT

The recent advances in enteral stents design and composition introduced novel usage and indications, heading to a continuous addition of prostheses application in clinical practice. Since the first use to palliate malignant diseases, improving patient's quality of life, in the last decades we assisted to a large spread, often becoming a first choice treatment in GI disorders. Indeed, the clinical indication of gastrointestinal stents includes endoscopic treatment of fistula and leaks besides the well-established role of restoring lumen patency in benign and malignant conditions. Several different kind of stents have been developed, each one with its own characteristics and benefits, including self-expandable plastic and metal stents, available as uncovered, partially covered, and fully covered as well as biodegradable stents. Recently, new drug-eluting stents, working both as palliative treatment and as local chemotherapy, are under evaluation. This review aims to critically evaluate the most recently published literature about enteral stents and to address endoscopists' choice for a better patient management.

Covered stents in cervical anastomoses following esophagectomy

INTRODUCTION

Anastomotic complications after esophagectomy are relatively frequent. The off-label use of self-expanding covered metal stents has been shown to be an effective initial treatment for leaks, but there is a paucity of literature regarding their use in cervical esophagogastric anastomoses. We reviewed our outcomes with anastomotic stenting after esophagectomy with cervical esophagogastric reconstruction.

METHODS

All stents placed across cervical anastomoses following esophagectomy from 2004 to 2014 were retrospectively reviewed. Indications for surgery and stent placement were collected. For patients with serial stents, each stent event was evaluated separately and as part of its series. Success was defined as resolution of indicated anastomotic problem for at least 90 days. Complications were defined as development of stent-related problems.

RESULTS

Twenty-three patients had a total of 63 stents placed (16 % prophylactic, 38 % leak, 46 % stricture). Sixty percent of patients had successful resolution of their initial anastomotic problem; 67 % required more than one stent. Strictures and leaks healed in 27 and 70 % of patients, respectively, at a median of 55.5 days. Stent-related complications occurred in 78 % of patients. Complications (per stent event) included 62 % migration, 11 % clinically significant tissue overgrowth, 8 % minor erosion (ulcers), and 8 % major erosion. Stents placed for stricture were more likely to result in complications, especially migration (76.7 vs. 48.5 %, p = 0.02). Preoperative chemoradiation was a significant risk factor for erosion (22.5 vs. 4.3 %, p = 0.05), but not for overall complications. Patients with major erosions had longer stent duration compared to those without (92 vs. 36 days, p = 0.14).

DISCUSSION

Although stents are effective at controlling post-esophagectomy anastomotic leaks, they are not effective for treating strictures. Stents have high complication rates, but most are minor. Chemoradiation is a risk factor for stent erosion. Caution should be used when stent duration exceeds 2-3 months due to the risk of erosion.

Endoscopic closure of acute perforations of the GI tract: a systematic review of the literature

BACKGROUND

Surgical repair of endoscopic perforations of the GI tract used to be the standard, but immediate, secure endoscopic closure has become an attractive alternative treatment with the potential to reduce morbidity and mortality.

OBJECTIVE

We aimed to perform a systematic review of the medical literature on endoscopic closure of acute iatrogenic perforations of the GI tract.

DESIGN

A systematic review was conducted according to the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-analyses) guidelines.

SETTING

Available medical literature from 1966 through November 2013.

PATIENTS

Patients with an acute perforation after an endoscopic procedure that was closed endoscopically.

INTERVENTIONS

Endoscopic closure of an acute perforation of the GI tract.

MAIN OUTCOME MEASUREMENTS

Clinically successful endoscopic closure.

RESULTS

In our search, we identified 726 studies, 702 of which had to be excluded. Twenty-four cohort studies (21 retrospective, 3 prospective) were included in the analysis. No randomized trials were identified. Overall, the methodological quality was low. The 24 studies included described 466 acute perforations in which endoscopic closure was attempted. Successful endoscopic closure was achieved in 419 cases (89.9%; 95% CI, 87%-93%). Successful closure was achieved in 90.2% (n = 359; 95% CI, 87%-93%) of cases by using endoclips, in 87.8% (n = 58; 95% CI, 78%-95%) by using the over-the-scope-clip, and in 100% (n = 2) by using a metal stent.

LIMITATIONS

Low methodological quality of included studies.

CONCLUSION

This systematic review suggests that endoscopic perforation closure is a safe and effective alternative for surgical intervention in selected cases; however, the overall methodological quality was low. Prospective, true consecutive studies are needed to define the definitive role of endoscopic closure of perforations.

Current applications of endoscopic suturing

Endoscopic suturing had previously been considered an experimental procedure only performed in a few centers and often by surgeons. Now, however, endoscopic suturing has evolved sufficiently to be easily implemented during procedures and is more commonly used by gastroenterologists. We have employed the Apollo OverStitch suturing device in a variety of ways including closure of perforations, closure of full thickness defects in the gastrointestinal wall created during endoscopic full thickness resection, closure of mucosotomies during peroral endoscopic myotomy, stent fixation, fistula closure, post endoscopic submucosal dissection, endoscopic mucosal resection and Natural Orifice Transluminal Endoscopic Surgery defect closures, post-bariatric surgery gastrojejunal anastomosis revision and primary sleeve gastroplasty.

Esophageal Stenting With Sutures: Time to Redefine Our Standards?

BACKGROUND AND STUDY AIMS

Migration is the most common complication of the fully covered metallic self-expanding esophageal stent (FCSEMS). Recent studies have demonstrated migration rates between 30% and 60%. The aim of this study was to determine the effect of fixation of the FCSEMS by endoscopic suturing on migration rate.

PATIENT AND METHODS

Patients who underwent stent placement for esophageal strictures and leaks over the last year were captured and reviewed retrospectively. Group A, cases, were patients who underwent suture placement and group B, controls, were patients who had stents without sutures. Basic demographics, indications, and adverse events (AEs) were collected. Kaplan-Meier analysis and Cox regression modeling were conducted to determine estimates and predictors of stent migration in patients with and without suture placement.

RESULTS

Thirty-seven patients (18 males, 48.65%), mean age 57.2 years (±16.3 y), were treated with esophageal FCSEMS. A total of 17 patients received sutures (group A) and 20 patients received stents without sutures (group B). Stent migration was noted in a total of 13 of the 37 patients (35%) [2 (11%) in group A and 11 (55%) in group B]. Using Kaplan-Meier analysis and log-rank analysis, fixation of the stent with suturing reduced the risk of migration (P=0.04). There were no AEs directly related to suture placement.

CONCLUSIONS

Anchoring of the upper flare of the FCSEMS with endoscopic sutures is technically feasible and significantly reduces stent migration rate when compared with no suturing, and is a safe procedure with very low AEs rates.

Esophageal covered stent fixation using an endoscopic over-the-scope clip. Mechanical proof of the concept and first clinical experience

BACKGROUND AND STUDY AIMS

Endoscopic suturing reduces stent migration, but is challenging and time-consuming. We compare endoscopic suturing versus anchoring with a novel over-the-scope clip (Padlock) to fix esophageal stents. Additionally, the first clinical case of Padlock stent fixation is reported.

MATERIALS AND METHODS

A fully covered esophageal stent was placed in 11 pigs and fixed with one figure-of-eight suture (n = 5) or with a Padlock (n = 4) or not fixed (controls; n = 2). The force required to mobilize the stent was recorded.

CLINICAL CASE

an esophageal stent was fixed with a Padlock and endoscopically removed 1 month later, in an 82-year-old patient.

RESULTS

Mean force (newton) to mobilize the stent was similar after suturing and Padlock fixation (23.99 ± 14.91 vs. 19.97 ± 7.62; p = 0.32). In controls was 7 and 11 Newtons. Suturing time (seconds) was longer than Padlock application (455.4 ± 144.83 vs. 155 ± 12.9; p = 0.002).

CLINICAL CASE

stent fixation was feasible and uncomplicated. Removal was easy, and only mild bleeding occurred.

CONCLUSIONS

Padlock is faster than endoscopic suturing and achieves similar stent fixation. The first clinical case confirms the feasibility of the method.

Endoscopic treatment of Crohn's complications

The progression to fistula and strictures is part of the natural history of Crohn's disease (CD) and these complications negatively affect the quality of life of CD patients. Surgery is the traditional treatment of CD strictures. However, due the chronicity of the inflammatory process and the associated fibrosis, postoperative recurrence occurs frequently. The lack of specific drug to treat fibrotic strictures and their irreversible nature has drawn the attention to less invasive and bowel-sparing therapeutic modalities. Endoluminal therapies may provide effective option in relieving symptoms associated with CD complications and reduce the need for repeated surgery with substantial clinical benefit. This review will discuss the current use and efficacy of the endoscopic treatment of CD complications. New endoscopic modalities and recent advances will be also evaluated.

Endoscopic suture fixation of self-expanding metallic stents with and without submucosal injection

BACKGROUND

Self-expanding metallic stents (SEMS) are useful for treating leaks after bariatric procedures but stent migration (12 to 40 %) remains a problem. Suture fixation has been used to minimize migration but has attendant risks of transmural penetration. We hypothesized that submucosal injection would decrease the risk of full thickness suture penetration while still providing greater pullout forces than endoscopic clipping.

METHODS

Porcine explant models and 155 mm SEMS were used with a force meter to measure the pullout forces required to dislodge the stent. Stents were first deployed without fixation and this pullout force acted as a control. The explants were then randomized to receive fixation with clips, endoscopic suturing with submucosal elevation, or endoscopic suturing without submucosal elevation. The pullout force was again measured and the ratio of the experimental to control pullout forces was used as a measure of the efficacy of the fixation.

RESULTS

Endoscopic suture fixation after submucosal injection resulted in statistically significant increased pullout force compared to clip fixation (n = 5; mean force ratio 462 %; 95 % confidence interval [CI] 281-643 %; p < 0.01). Endoscopic suturing fixation without submucosal injection also resulted in statistically significant increased pullout force (n = 5; mean force ratio 765 %; 95 % CI 258-632 %; p < 0.01). Fixation with clips did not result in significantly increased pullout force compared to no fixation (n = 5; mean force ratio 108 %; 95 % CI 56-159 %; p < 0.01). Submucosal injection also eliminated full thickness suture penetration (0/10 submucosal injection; 7/10 no injection).

CONCLUSIONS

Endoscopic suture fixation of SEMS resulted in a statistically significant increase in pullout force necessary to displace the stents. Submucosal injection prior to suture fixation preserves the increased pullout force while minimizing the risk of transmural penetration with the potential for less risk of injury to mediastinal structures.

Current innovations in endoscopic therapy for the management of colorectal cancer: from endoscopic submucosal dissection to endoscopic full-thickness resection

Endoscopic submucosal dissection (ESD) is accepted as a minimally invasive treatment for colorectal cancer. However, due to technical difficulties and an increased rate of complications, ESD is not widely used in the colorectum. In some cases, endoscopic treatment alone is insufficient for disease control, and laparoscopic surgery is required. The combination of laparoscopic surgery and endoscopic resection represents a new frontier in cancer treatment. Recent developments in advanced polypectomy and minimally invasive surgical techniques will enable surgeons and endoscopists to challenge current practice in colorectal cancer treatment. Endoscopic full-thickness resection (EFTR) of the colon offers the potential to decrease the postoperative morbidity and mortality associated with segmental colectomy while enhancing the diagnostic yield compared to current endoscopic techniques. However, closure is necessary after EFTR and natural transluminal endoscopic surgery (NOTES). Innovative methods and new devices for EFTR and suturing are being developed and may potentially change traditional paradigms to achieve minimally invasive surgery for colorectal cancer. The present paper aims to discuss the complementary role of ESD and the future development of EFTR. We focus on the possibility of achieving EFTR using the ESD method and closing devices.

Endoscopic suturing closure of large mucosal defects after endoscopic submucosal dissection is technically feasible, fast, and eliminates the need for hospitalization (with videos)

BACKGROUND

Endoscopic submucosal dissection (ESD) is less invasive than surgical resection, but the large mucosal defects after ESD may lead to adverse events necessitating hospitalizations.

OBJECTIVE

To evaluate the use of an endoscopic suturing device for closure of large mucosal defects after ESD.

DESIGN AND SETTING

Retrospective, single-center study.

PATIENTS

Twelve consecutive patients underwent ESD.

INTERVENTIONS

All lesions were removed by using a previously described ESD technique. The large mucosal defects post-ESD were completely closed with the endoscopic suturing device, and all patients were discharged home with subsequent clinical and endoscopic follow-up.

MAIN OUTCOME MEASUREMENTS

Bleeding and perforation rates after ESD with mucosal defect closure.

RESULTS

ESD followed by endoscopic suturing of the mucosal defects was performed in 12 patients (mean age, 64.7 ± 11.2 years, 4 lesions in the stomach, 8 lesions in the colon; mean lesion size, 42.5 ± 14.8 mm) over a period of 8 months. All lesions (100%) were removed en bloc. Closure of post-ESD defects with an endoscopic suturing device was technically feasible and fast (mean closure time, 10.0 ± 5.8 minutes per patient). Only 1 stitch (continuous suturing line) was required for complete closure in 8 patients. In the other 4 patients, the mucosal defect was closed with 2 to 4 separate stitches (mean number of sutures per patient, 1.6 ± 1.0). There were no immediate or delayed adverse events in any of the study patients.

LIMITATIONS

Retrospective study.

CONCLUSIONS

Closure of large post-ESD defects with the Overstitch endoscopic suturing device is technically feasible and fast and can significantly decrease treatment cost by eliminating the need for hospitalization.

The role of endoscopic stents in the management of chronic anastomotic and staple line leaks and chronic strictures after bariatric surgery

BACKGROUND

The use of endoluminal stents has been proposed for the management of fistulas and anastomotic strictures after bariatric surgery. The objective of our study was to determine the success of endoscopically placed, self-expandable metal stents (SEMS) in bariatric patients specifically with either chronic persistent anastomotic or staple line leaks/fistulas or chronic, persistent anastomotic strictures.

METHODS

We treated 21 patients including 5 with chronic staple line leaks/fistulas (4 from the gastric sleeve after biliopancreatic diversion with duodenal switch [BPD/DS] and 1 after removal of an eroding laparoscopic adjustable gastric band) and 16 with chronic anastomotic strictures (15 at the gastrojejunostomy after Roux-en-Y gastric bypass and 1 at the duodenoileal anastomosis after BPD/DS). Patients with early leaks or anastomotic strictures were excluded.

RESULTS

All but one of these patients had been referred to our institution after chronic treatment elsewhere was unsuccessful with prior stent placement for fistulas or multiple endoscopic dilations for strictures. Their bariatric operations had been performed a mean of 386 days beforehand. Stent placement was performed successfully in all patients without complications but was successful in only 4 of 21 patients (19%)-2 with chronic fistulas and 2 with chronic anastomotic strictures. Stent migration occurred in 10 patients (47%); the migrated stents were removed/replaced endoscopically in 7 patients but required elective operative removal in 3 with concomitant correction of the leak, fistula, or anastomotic stricture; none were operated emergently.

CONCLUSION

Only 4 of 21 patients with a chronic persistent leak or anastomotic stricture were treated definitively using a SEMS. Although endoluminal stents may not lead to resolution of a chronic leak or stricture, SEMS may suppress ongoing sepsis and allow patients to undergo nutritional resuscitation orally before operative correction.

Endoscopic therapy in inflammatory bowel diseases (with videos)

Endoscopic therapies are important modalities in the treatment of IBD, adjunct to medical and surgical approaches. These therapeutic techniques are particularly useful in the management of IBD-associated or IBD surgery–associated strictures, fistulas, and sinuses and colitis-associated neoplasia. Although the main focus of endoscopic therapies in IBD has been on balloon stricture dilation and ablation of adenoma-like lesions, new endoscopic approaches are emerging, including needle-knife stricturotomy, needle-knife sinusotomy, endoscopic stent placement, and fistula tract injection. Risk management of endoscopy-associated adverse events is also evolving. The application of endoscopic techniques in novel ways in the treatment of IBD is just beginning and will likely expand rapidly in the near future.