Stenosis in gastric bypass: Endoscopic management

Magnetic compression anastomosis gastrojejunostomy: feasibility and efficacy of a novel device in a swine model

BACKGROUND

Means of addressing technical challenges in forming gastrojejunostomy (GJ) anastomoses and maintaining their patency are sought.

OBJECTIVES

Evaluation of preclinical feasibility and healing efficacy of a novel linear magnetic compression anastomosis (MCA) device to form a patent GJ versus sutured jejunal enterotomy (JE) sites in swine.

SETTING

Single-center veterinary testing facility.

METHODS

Feasibility of 3 prototype sizes (4, 6, and 8 cm) of a metal MCA device (MCAD) to form a patent GJ was evaluated over 6 weeks. A distal magnet was laparoscopically inserted in the jejunum, a proximal magnet was placed gastroscopically in the stomach; magnets were aligned to gradually form an anastomosis, self-detached, and be expelled. At necropsy, MCAs were assessed for patency and compared with JE tissues to evaluate wound healing.

RESULTS

MCADs aligned at the GJ location without complications. In 5/6 MCAD pairs, dislodgement occurred between 7 and 26 days; expulsion 13-31 days; 1 MCAD pair was retained in the stomach. At necropsy, all pigs were healthy, gaining a mean 15.0 kg. Anastomoses were not adequately patent in 2/4 pigs receiving the 4-cm or 6-cm MCADs because their linear length was too small. But, anastomoses of both pigs receiving the 8-cm MCADs maintained full patency. Minimal inflammation and fibrosis were seen in MCA specimens versus sutured enterotomies.

CONCLUSIONS

A novel linear MCA device was feasible and effectively created a patent GJ anastomosis in swine with minimal inflammation and fibrosis. The MCAD may be appropriate for clinical evaluation.

Esophageal Self-Expandable Metal Stents Can Fracture in the Distal Third When Used for Post-Bariatric Surgery Complications: A Single Center Experience and Review of the Literature with Video

Background: Esophageal self-expandable metal stents (SEMS) are an important endoscopic tool. These stents have now been adapted successfully to manage post-bariatric surgery complications such as anastomotic leaks and strictures. In centers of expertise, this has become the primary standard-of-care treatment given its minimally invasive nature, and that it results in early oral feeding, decreased hospitalization, and overall favorable outcomes. Self-expandable metal stents (SEMS) fractures are a rare complication of unknown etiology. We aimed to investigate possible causes of SEMS fractures and highlight a unique endoscopic approach utilized to manage a fractured and impaled SEMS. Methods: This is a retrospective study of consecutive patients who underwent esophageal SEMS placement between 2015-2021 at a tertiary referral center to identify fractured SEMS. Patient demographics, stent characteristics, and possible etiologies of fractured SEMS were identified. A comprehensive literature review was also conducted to evaluate all prior cases of fractured SEMS and to hypothesize fracture theories. Results: There were seven fractured esophageal SEMS, of which six were used to manage post-bariatric surgery complications. Five SEMS were deployed with their distal ends in the gastric antrum and proximal ends in the distal esophagus. All stents fractured within 9 weeks of deployment. Most stents (5/7) were at least 10 cm in length with fractures commonly occurring in the distal third of the stents (6/7). The wires of a fractured SEMS were embedded within the esophagogastric junction in one case, prompting the use of an overtube that was synchronously advanced while steadily extracting the stent. Discussion: We suggest the following four etiologies of SEMS fractures: anatomical, physiological, mechanical, and chemical. Stent curvature at the stomach incisura can lead to strain- and stress-related fatigue due to mechanical bending with exacerbation from respiratory movements. Physiologic factors (gastric body contractions) can result in repetitive squeezing of the stent, adding to metal fatigue. Intrinsic properties (long length and low axial force) may be contributing factors. Lastly, the stomach acidic environment may cause nitinol-induced chemical weakness. Despite the aforementioned theories, SEMS fracture etiology remains unclear. Until more data become available, it may be advisable to remove these stents within 6 weeks.

Evaluating outcomes among surgeons who changed their technique for gastric bypass: a state-wide analysis from 2011 to 2021

INTRODUCTION

Technical variation exists when performing the gastrojejunostomy during Roux-en-Y gastric bypass (RYGB). However, it is unclear whether changing technique results in improved outcomes or patient harm.

METHODS

Surgeons participating in a state-wide bariatric surgery quality collaborative who completed a survey on how they perform a typical RYGB in 2011 and again in 2021 were included in the analysis (n = 31). Risk-adjusted 30-day complication rates and case characteristics for cases in 2011 were compared to those in 2021 among surgeons who changed their gastrojejunostomy technique from end-to-end anastomosis (EEA) to either a linear staple or handsewn anastomosis (LSA/HSA). In addition, case characteristics and outcomes among surgeons who maintained an EEA technique throughout the study period were assessed.

RESULTS

A total of 15 surgeons (48.3%) changed their technique from EEA to LSA/HSA while 7 surgeons (22.3%) did not. Nine surgeons did LSA or HSA the entire period and therefore were not included. Surgeons who changed their technique had significantly lower rates of surgical complications in 2021 when compared to 2011 (1.9% vs 5.1%, p = 0.0015), including lower rates of wound complications (0.5% vs 2.1%, p = 0.0030) and stricture (0.1% vs 0.5%, p = 0.0533). Likewise, surgeons who did not change their EEA technique, also experienced a decrease in surgical complications (1.8% vs 5.8%, p < 0.0001), wound complications (0.7% vs 2.1%, p < 0.0001) and strictures (0.2% vs 1.2%, p = 0.0006). Surgeons who changed their technique had a significantly higher mean annual robotic bariatric volume in 2021 (30.0 cases vs 4.9 cases, p < 0.0001) when compared to those who did not.

CONCLUSIONS

Surgeons who changed their gastrojejunostomy technique from circular stapled to handsewn demonstrated greater utilization of the robotic platform than those who did not and experienced a similar decrease in adverse events during the study period, despite altering their technique. Surgeons who chose to modify their operative technique may be more likely to adopt newer technologies.

Massive enlargement of gastric pouch as a complication of gastrojejunal anastomotic stenosis following one anastomosis laparoscopic gastric bypass: A case report

INTRODUCTION AND IMPORTANCE

By 2030 it is predicted that 1 in 5 women and 1 in 7 men will be living with obesity. The only long-term effective strategy for achieving significant weight loss over time is surgical treatment. One Anastomosis Gastric Bypass (OAGB) has been proposed as an effective therapeutic option. Stenosis of Gastro-Jejunal Anastomosis (GJA) is one of the most common long-term complications and its cause recognized as multifactorial.

CASE PRESENTATION

We present the case of a patient with a history of progressive postoperative oral intolerance after OAGB with 60 kg weight loss (BMI 20.7 kg/m2). Severe stenosis of the GJA and massive dilation of the gastric remnant was documented, treated multiple times with endoscopic balloon dilation. He was referred to our unit due to persistent symptoms. Revision surgery to a Gastric Bypass was programmed, ultimately performed via an open approach with resection of 80 % of the gastric remnant.

CLINICAL DISCUSSION

Endoscopic dilatation and surgical revision are the two primary treatment options for GJA stricture. In refractory cases to pneumatic dilation, laparoscopic revision surgery is indicated, however an open approach is frequently required, as surgeries are technically demanding due to distorted anatomy in this population.

CONCLUSION

Operations to correct chronic complications are tailored to the patient's anatomy as well as the symptoms or pathologies they are intended to correct. Whilst revision surgeries are associated with an increased risk of conversion, complications and longer hospital stay, they can be performed safely in experienced centers.

Operative management of acute abdomen after bariatric surgery in the emergency setting: the OBA guidelines

BACKGROUND

Patients presenting with acute abdominal pain that occurs after months or years following bariatric surgery may present for assessment and management in the local emergency units. Due to the large variety of surgical bariatric techniques, emergency surgeons have to be aware of the main functional outcomes and long-term surgical complications following the most performed bariatric surgical procedures. The purpose of these evidence-based guidelines is to present a consensus position from members of the WSES in collaboration with IFSO bariatric experienced surgeons, on the management of acute abdomen after bariatric surgery focusing on long-term complications in patients who have undergone laparoscopic sleeve gastrectomy and laparoscopic Roux-en-Y gastric bypass.

METHOD

A working group of experienced general, acute care, and bariatric surgeons was created to carry out a systematic review of the literature following the Preferred Reporting Items for Systematic Review and Meta-analysis Protocols (PRISMA-P) and to answer the PICO questions formulated after the Operative management in bariatric acute abdomen survey. The literature search was limited to late/long-term complications following laparoscopic sleeve gastrectomy and laparoscopic Roux-en-Y gastric bypass.

CONCLUSIONS

The acute abdomen after bariatric surgery is a common cause of admission in emergency departments. Knowledge of the most common late/long-term complications (&gt; 4 weeks after surgical procedure) following sleeve gastrectomy and Roux-en-Y gastric bypass and their anatomy leads to a focused management in the emergency setting with good outcomes and decreased morbidity and mortality rates. A close collaboration between emergency surgeons, radiologists, endoscopists, and anesthesiologists is mandatory in the management of this group of patients in the emergency setting.

First fully endoscopic metabolic procedure with NOTES gastrojejunostomy, controlled bypass length and duodenal exclusion: a 9-month porcine study

We conducted a pilot study of a potential endoscopic alternative to bariatric surgery. We developed a Natural Orifice Transluminal Endoscopic Surgery (NOTES) gastric bypass with controlled bypass limb length using four new devices including a dedicated lumen-apposing metal stent (GJ-LAMS) and pyloric duodenal exclusion device (DED). We evaluated procedural technical success, weight change from baseline, and adverse events in growing Landrace/Large-White pigs through 38 weeks after GJ-LAMS placement. Six pigs (age 2.5 months, mean baseline weight 26.1 ± 2.7 kg) had initial GJ-LAMS placement with controlled bypass limb length, followed by DED placement at 2 weeks. Technical success was 100%. GJ-LAMS migrated in 3 of 6, and DED migrated in 3 of 5 surviving pigs after mucosal abrasion. One pig died by Day 94. At 38 weeks, necropsy showed 100–240 cm limb length except for one at 760 cm. Weight gain was significantly lower in the pigs that underwent endoscopic bypass procedures compared to expected weight for age. This first survival study of a fully endoscopic controlled bypass length gastrojejunostomy with duodenal exclusion in a growing porcine model showed high technical success but significant adverse events. Future studies will include procedural and device optimizations and comparison to a control group.

Use of a Lumen-Apposing Metal Stent for Management of Pouch Outlet Stenosis After Vertical Banded Gastroplasty

Lumen-apposing metal stents (LAMSs) offer a novel alternative for the treatment of anastomotic strictures or short, benign gastrointestinal strictures. In the bariatric realm, LAMSs provide a potentially safer, efficacious, and nonsurgical approach to surgical revision. Here, we present a case where a LAMS was successfully used to manage pouch outlet stenosis from a previous vertical banded gastroplasty.

Splenectomy post-splenic injury following dilatation of Roux-en-y enterostomy stomal stricture: an unexpected complication

A 53-year-old woman presented in the early hours of the morning with generalised abdominal pain and features of hypovolaemic shock, following a dilatation of an enterostomy stricture 12 hours prior. Dilatation of this stricture was indicated by ongoing dysphagia, which had been successfully dilated twice before without incident. Standard resuscitative measures and confirmation of the endoscopically-caused splenic injury by CT scan were followed promptly by a splenectomy to control ongoing blood loss. The strictured enterostomy was revised to mitigate further need for endoscopic dilatation. The patient recovered well and was discharged shortly after on a soft diet.

Endoscopic balloon dilation for treatment of sleeve gastrectomy stenosis: a systematic review and meta-analysis

BACKGROUND AND AIMS

Gastric stenosis is a rare but potentially serious adverse event after sleeve gastrectomy. Despite current suboptimal treatments, endoscopic balloon dilatation (EBD) has emerged as a safe and efficacious approach. The purpose of this study is to assess the overall success of EBD for sleeve gastrectomy stenosis (SGS) as first-line therapy.

METHODS

MEDLINE, Embase, Web of Science, Google Scholar, and Cochrane Database were searched from inception to July 2018. The primary outcome was defined as overall success rate of clinical resolution of SGS obstructive symptoms with EBD, expressed as pooled event rate and 95% confidence interval (CI). The secondary predefined outcomes include EBD success rates for SGS in the proximal (cardia) location or mid-distal location (antrum/incisura), in early SGS (up to 3 months after laparoscopic sleeve gastrectomy), and late SGS (3 months or longer after laparoscopic sleeve gastrectomy) and success rate of cases requiring stents or salvage surgery.

RESULTS

Eighteen studies encompassing 426 patients were analyzed. The average age and body mass index were 41.7 years and 40.1 kg/m², respectively, and the average number of dilations for all cases was 1.8 per person. Overall EBD success rate was 76% (95% CI, .67-.86). EBD success rate in the proximal SGS was 90% (95% CI, 63%-98%), distal SGS was 70% (95% CI, 47%-86%), early SGS within 3 months was 59% (95% CI, 34%-79%), and late SGS after 3 months was 61% (95% CI, 41%-78%). Seventeen percent of patients underwent secondary salvage surgery, with a success rate of 91% (95% CI, 80%-96%).

CONCLUSIONS

Endoscopic balloon dilation appears to be a safe and effective minimally invasive alternative to surgical revision and should be used as first-line therapy for SGS.

Endoscopic balloon dilatation as an effective treatment for lower and upper benign gastrointestinal system anastomotic stenosis

OBJECTIVE

Endoscopic balloon dilatation (EBD) is currently accepted as an effective, safe, and first-line treatment of postoperative benign gastrointestinal anastomosis stenosis (BGAS); however, a limited number of publications on the subject exist in the literature. The aim of the study was to retrospectively evaluate the efficiency of endoscopic dilatation in patients with postoperative intestinal anastomotic stenoses at a single surgical center.

METHODS

Patients with postoperative BGAS treated by EBD at our institution from February 2008 to 2012 were included. The dilatations were all performed using through-the-scope balloons. The balloon was introduced into the stricture using a guidewire under radiologic guidance. Each dilatation session consisted of 2 to 3 two-minute multistep inflations of the balloon until adequate dilatation was achieved.

RESULTS

Of the 48 patients included in the study, 44 patients (91.7%) fully recovered and 4 (8.3%) did not respond to treatment. The mean follow-up period was 24 months (range, 3 to 57 mo). Four patients who did not respond to the procedure were treated surgically. Two patients (4.1%) with intestinal perforation during EBD were treated conservatively with a stent.

CONCLUSIONS

EBD has a low rate of complications and a high success rate, is well tolerated, and avoids further surgical procedures for BGAS. Therefore, EBD should be the first choice of treatment for postoperative anastomotic stenoses.

CORRELATION BETWEEN PRE AND POSTOPERATIVE UPPER DIGESTIVE ENDOSCOPY IN PATIENTS WHO UNDERWENT ROUX-EN-Y GASTROJEJUNAL BYPASS

BACKGROUND

Bariatric operations have variable range of complications and postoperative benefits. Gastroesophageal reflux is considered potential factor that may result in damage to the esophageal mucosa and this subject is quite controversial in the literature.

AIM

To evaluate patients who underwent to Roux-en-Y gastrojejunal bypass correlating epidemiologic and endoscopic findings in pre and postoperative periods.

METHOD

A retrospective, paired study which evaluated 110 patients. Inclusion criteria were formal indication for bariatric surgery and patients with pre and postoperative endoscopy. Exclusion criteria were previous bariatric surgery, patients subjected to other types of bariatric surgery and those who had no pre or postoperative upper digestive endoscopy. The epidemiological variables were: sex, age, body mass index, type 2 diabetes mellitus or impaired glucose tolerance, and preoperative dyslipidemia.

RESULTS

The preoperative upper endoscopy was normal in 26.4% of the patients. Among endoscopic alterations, the hiatus hernia was the most prevalent followed by non-erosive gastritis. The postoperative upper endoscopy was normal in 40.9% and stenosis was the most prevalent followed by marginal ulcer. Correlation on pre and postoperative endoscopies, was found 100% reduction of hiatal hernias and 88% of esophagitis. There was no statistical significance in relationship to anastomotic stenosis with preoperative other variables. Conclusions . There was significant decrease in postoperative hiatus hernia, erosive esophagitis, non-erosive esophagitis, erosive gastritis and non-erosive gastritis with the operation. Stenosis of the gastrojejunostomy anastomosis was the most prevalent postoperative complication with no correlation with preoperative variables.

COMPLICATIONS RELATED TO GASTRIC BYPASS PERFORMED WITH DIFFERENT GASTROJEJUNAL DIAMETERS

Background:

Among the options for surgical treatment of obesity, the most widely used has been the Roux-en-Y gastric bypass. The gastrojejunal anastomosis can be accomplished in two ways: handsewn or using circular and linear stapled. The complications can be divided in early and late.

Aim:

To compare the incidence of early complications related with the handsewn gastrojejunal anastomosis in gastric bypass using Fouchet catheter with different diameters.

Method:

The records of 732 consecutive patients who had undergone the bypass were retrospectively analyzed and divided in two groups, group 1 with 12 mm anastomosis (n=374), and group 2 with 15 mm (n=358).

Results:

The groups showed anastomotic stenosis with rates of 11% and 3.1% respectively, with p=0.05. Other variables related to the anastomosis were also analyzed, but without statistical significance (p>0.05).

Conclusion:

The diameter of the anastomosis of 15 mm was related with lower incidence of stenosis. It was found that these patients had major bleeding postoperatively and lower surgical site infection, and in none was observed presence of anastomotic leak.

Factors associated with complications or failure of endoscopic balloon dilation of anastomotic stricture secondary to Roux-en-Y gastric bypass surgery

INTRODUCTION

Roux-en-Y gastric bypass is a commonly used technique of bariatric surgery. One of the most important complications is gastrojejunal anastomotic stricture. Endoscopic balloon dilation appears to be well tolerated and effective, but well-designed randomized, controlled trials have not yet been conducted.

OBJECTIVE

Identify factors associated with complications or failure of endoscopic balloon dilation of anastomotic stricture secondary to Roux-en-Y gastric bypass surgery.

SETTING

Gastrointestinal endoscopy service, university hospital, Brazil.

METHODS

The records of 64 patients with anastomotic stricture submitted to endoscopic dilation with hydrostatic balloon dilation were reviewed. Information was collected on gastric pouch length, anastomosis diameter before dilation, number of dilation sessions, balloon diameter at each session, anastomosis diameter after the last dilation session, presence of postsurgical complications, endoscopic complications, and outcome of dilation. Comparisons were made among postsurgical and endoscopic complications; number of dilations, balloon diameter; anastomosis diameter before dilation; and dilation outcome.

RESULTS

Success of dilation treatment was 95%. Perforation was positively and significantly associated with the number of dilation sessions (P = .03). Highly significant associations were found between ischemic segment and perforation (P<.001) and between ischemic segment and bleeding (P = .047). Ischemic segment (P = .02) and fistula (P = .032) were also associated with dilation failure.

CONCLUSION

Ischemic segment and fistula were found to be important risk factors for balloon dilation failure. The greater the number of dilation sessions, the greater the number of endoscopic complications.

Long term results of the use of compression anastomosis clips (CAC) in gastrointestinal surgery – the first report

The aim of the study was to present the first long-term results on the clinical use of compression anastomosis clips (CAC) in upper and lower gastrointestinal tract anastomoses.

MATERIAL AND METHODS

The study included 50 patients who underwent anastomosis of the upper (n = 32) or lower GI tract (n = 18) with the use of CAC. In the period of 6-7 months after the surgery, patients underwent endoscopic examination and computed tomography evaluation of the anastomosis. Each anastomosis was evaluated macro and microscopically. The width of anastomoses was evaluated using a 4-point-scale for grading stenosis.

RESULTS

Of the 50 patients who underwent anastomosis with compression anastomosis clip, 28 (56%) patients reported to the follow-up examination within 190-209 days of the execution of the anastomosis. Among the 22 patients who did not report to the study, 18 (36%) patients died within 91-154 days from the execution of the anastomosis (mean 122 days), 4 (8%) patients were impossible to contact after discharge from hospital. Two mild stenoses (I0) were diagnosed; 1 of them was found in the gastroenterostomy and 1 in Braun enteroenterostomy. Microscopic changes were diagnosed in 4 anastomoses (3 gastroenterostomies, 1 Braun enteroenterostomy). Anastomoses were well-formed and wide, scars in the line of anastomoses were thin.

CONCLUSIONS

During the period of 6 months after the anastomoses performed using CAC have been formed, they were evaluated as unobstructed and functioning properly; therefore, they can be safely performed within the upper and lower gastrointestinal tract.