Evaluation of the rate of marginal ulcer formation after bariatric surgery using the MBSAQIP database

Early marginal ulceration prevalence following primary RYGB: a rare events model of the MBSAQIP 2015-2021

PURPOSE

Marginal ulceration (MU) following Roux-en-Y gastric bypass (RYGB) is an established complication, with early MU (within 30-days of operation) being less understood compared to its late counterpart. This study aims to identify risk factors for early MU in patients undergoing primary RYGB.

METHODS

Utilizing data from the Metabolic and Bariatric Surgery Accreditation Quality Improvement Project (MBSAQIP 2015-2021), 1,346,468 records were evaluated. After exclusions for revisions, conversions, pediatric cases, nonbinary gender, missing body mass index (BMI) data, and missing operative time; 291,625 cases of primary RYGB were included for full analysis and rare events modeling of early MU.

RESULTS

The prevalence of early MU was .29% (n = 850). Higher rates of early MU were associated with BMI, race, history of diabetes mellitus (DM), prior thrombotic complications (deep vein thrombosis (DVT) and pulmonary embolism (PE)), prior percutaneous cardiac intervention (PTC), immunosuppressive therapy, and anticoagulation status. Additionally, procedural aspects like the nonspecialization of the surgeon and longer operative times also correlated with higher early MU rates. Rare-events regression modeling noted significant associations of early MU with younger age, diabetes requiring insulin, history of PTC, DVT, immunosuppressive therapy, and anticoagulation status.

CONCLUSION

Early MU remains a relatively rare complication. The lower than previously reported occurrence suggests possible improvements in both patient preparation and surgical technique. The identification of relevant risk factors enables better perioperative and intraoperative management of patients at risk of developing early MU.

Technical Variations and Considerations around OAGB in IFSO-APC and IFSO-MENAC Chapters, an Expert Survey

OBJECTIVE

This study aimed to evaluate the technical variations of one-anastomosis gastric bypass (OAGB) among IFSO-APC and MENAC experts.

BACKGROUND

The multitude of technical variations and patient selection challenges among metabolic and bariatric surgeons worldwide necessitates a heightened awareness of these issues. Understanding different perspectives and viewpoints can empower surgeons performing OAGB to adapt their techniques, leading to improved outcomes and reduced complications.

METHODS

The scientific team of IFSO-APC, consisting of skilled bariatric and metabolic surgeons specializing in OAGB, conducted a confidential online survey. The survey aimed to assess technical variations and considerations related to OAGB within the IFSO-APC and IFSO-MENAC chapters. A total of 85 OAGB experts participated in the survey, providing their responses through a 35-question online format. The survey took place from January 1, 2024, to February 15, 2024.

RESULTS

Most experts do not perform OAGB for children and adolescents younger than 18 years. Most experts create the gastric pouch over a 36-40-F bougie and prefer to create a gastrojejunostomy, at the posterior wall of the gastric pouch. An anti-reflux suture during OAGB is performed in all patients by 51.8% of experts. Most experts set a common limb length of > 4 m in revisional and conversional OAGBs to prevent nutritional complications.

CONCLUSION

The ongoing debate among metabolic and bariatric surgeons regarding the technical variations and patient selection in OAGB remains a significant point of discussion. This survey demonstrated the variations in technical aspects and patient selection for OAGB among MBS surgeons in the IFSO-APC and IFSO-MENAC chapters. Standardizing the OAGB technique is crucial to ensure optimal safety and efficacy in this procedure.

Early Marginal Ulcer After Roux-en-Y Gastric Bypass: MBSAQIP Database Analysis of Trends and Predictive Factors

PURPOSE

Marginal ulcer (MU) is a known complication after Roux-en-Y gastric bypass (RYGB) that carries significant morbidity. First, we aimed to determine the trends and the rates of readmission, reintervention, and reoperation of 30-day MU. Second, we aim to determine the predictive factors associated with this complication.

MATERIALS AND METHODS

Patients who had 30-day marginal ulcer (MU) after LRYGB were identified using the 2015-2021 MBSAQIP database. Those who had a 30-day complication other than MU were excluded. Bivariate and logistic regression analyses were performed.

RESULTS

Among 213,104 patients undergoing laparoscopic RYGB, 638 (0.3%) showed 30-day MU. This group of patients required endoscopic interventions, readmissions, and reoperations at rates of 88%, 72%, and 9%, respectively. Predictive factors for 30-day MU after RYGB were renal insufficiency, history of DVT, previous cardiac stent, African American race, chronic steroid use, COPD, therapeutic anticoagulation, anastomotic leak test, GERD, and operative time > 120 min. Additionally, patients who had 30-day MU showed significantly higher rates of overall complications such as pulmonary, cardiac and renal complications, unplanned ICU admission, blood transfusions, venous thromboembolism (VTE), and non-home discharge (p < 0.05). The MU group showed similar rates of 30-day mortality as those without this complication (0.2% vs 0.1%, p = 0.587).

CONCLUSIONS

The incidence of 30-day MU following RYGB was 0.3%. Patients with MU required endoscopic interventions, readmissions, and reoperations at rates of 88%, 72%, and 9%, respectively. Some preoperative and intraoperative factors contributed to an increased risk of 30-day MU.

Marginal Ulcer Incidence and the Population of Gastrin Producing G cells Retained in the Gastric Pouch after Roux-en-Y Gastric Bypass: Is There a Relationship?

INTRODUCTION

Marginal ulcers are the most prevalent endoscopic abnormality after RYGB. The etiology is still poorly understood; however, an increase in acid secretion has been strongly implicated as a causal agent. Although gastrin is the greatest stimulant of acid secretion, to date, the presence of gastrin producing G cells retained in the gastric pouch, related to the occurrence of marginal ulcers, has not been evaluated.

OBJECTIVE

Evaluate the density of G cells and parietal cells in the gastric pouch of RYGB patients with a diagnosis of marginal ulcer on the post-op EGD.

METHOD

We retrospectively evaluated 1104 gastric bypasses performed between 2010 and 2020. Patients with marginal ulcer who met the inclusion criteria and controls were selected from this same population. Endoscopic gastric pouch biopsies were evaluated using immunohistochemical study and HE staining to assess G cell and parietal cell density.

RESULTS

In total, 572 (51.8%) of the patients performed endoscopic follow-up after RYGB. The incidence of marginal ulcer was 23/572 (4%), and 3 patients required revision surgery due to a recalcitrant ulcer. The mean time for ulcer identification was 24.3 months (2-62). G cell count per high-power field (× 400) was statistically higher in the ulcer group (p < 0.05). There was no statistical difference in parietal cell density between groups (p 0.251).

CONCLUSION

Patients with a marginal ulcer after gastric bypass present a higher density of gastrin-producing G cells retained in the gastric pouch.

One-anastomosis gastric bypass (OAGB) versus Roux-en-Y gastric bypass (RYGB) as revisional procedures after failed laparoscopic sleeve gastrectomy (LSG): systematic review and meta-analysis of comparative studies

INTRODUCTION

The aim of this study was to compare weight loss and gastroesophageal reflux disease (GERD) remission after one-anastomosis gastric bypass (OAGB) versus Roux-en-Y gastric bypass (RYGB) as revisional procedures after laparoscopic sleeve gastrectomy (LSG).

METHODS

In PubMed, Embase, and Cochrane Library, a search was performed using the terms "Roux-en-Y gastric bypass versus one anastomosis gastric bypass," "revisional surgery," and "sleeve gastrectomy." Only original articles in English language comparing OAGB and RYGB were included. No temporal interval was set. The primary outcome measure was weight loss (%TWL). The secondary endpoints were leak, bleeding, marginal ulcer, and GERD. PRISMA flowchart was used. Differences in continuous and dichotomous outcome variables were expressed as mean difference (MD) and risk difference (RD) with 95% CI, respectively. Heterogeneity was assessed by using I2 statistic.

RESULTS

Six retrospective comparative articles were included in the present meta-analysis. Weight loss analysis showed a MD = 5.70 (95% CI 4.84-6.57) in favor of the OAGB procedure with a statistical significance (p = 0.00001) and no significant statistical heterogeneity (I2 = 0.00%). There was no significant RD for leak, bleeding, or marginal ulcer after the two revisional procedures. After conversion to OAGB, remission from GERD was 68.6% (81/118), and it was 80.6% (150/186) after conversion to RYGB with a RD = 0.10 (95% CI -0.04, 0.24), no statistical significance (p = 0.19), and high heterogeneity (I2 = 96%). De novo GERD was 6.3% (16/255) after conversional OAGB, and it was 0.5% (1/180) after conversion to RYGB with a RD = -0.23 (95% CI -0.57, 0.11), no statistical significance (p = 0.16), and high heterogeneity (I2 = 92%).

Revision Gastrojejunostomy Versus Suturing With and Without Omental Patch for Perforated Marginal Ulcer Treatment After Roux-en-Y Gastric Bypass

BACKGROUND

Ulceration at the gastrojejunostomy is a late bariatric surgery complication in 0.6-16% of Roux-en-Y gastric bypass (RYGB) patients. As there is no general consensus on management of acute ulcer perforations, we compare two methods of surgical repair: the most commonly performed procedure, suturing of ulcer with or without omental patch versus revision gastrojejunostomy (RG).

METHODS

A retrospective chart review of cases at a single large, Midwestern US high-volume bariatric center from November 2, 2006 through March 11, 2021 identified 144 RYGB patients undergoing surgical repair for a perforated ulcer: 72 treated by SGP and 72 by RG. Outcomes, including length of stay, leaks, readmissions, and reoperations, were compared. Categorical variables were compared by Chi-square tests and continuous variables by ANOVA.

RESULTS

Patients were primarily female (77.1%) and Caucasian (97.2%), 49.7 ± 12.5 years old, and 90.6 ± 26.6 kg. Most had laparoscopic RYGBs (98.6%). There were no demographic differences between groups. Of the RG patients, 11.4% experienced ulcer recurrence versus 41.7% of SGP patients (p < .001), and 2.8% of RG versus 11.1% of SGP patients required a reversal (p < .05). No significant differences between groups occurred in time to perforation (3.2 vs. 2.5 years for RG and SGP groups, respectively), length of stay (5.0 vs. 6.8 days), leaks (1.4% vs. 2.8%), readmissions (4.2% vs. 4.2%), or reoperations (2.8% vs 5.6%).

CONCLUSIONS

Patients developing perforated marginal ulcers after RYGB can be safely and effectively treated by revision gastrojejunostomy with a lower likelihood of ulcer recurrence. Short-term morbidity was comparable to suturing with or without an omental patch.

Impact of Chronic Immunosuppression on Short-, Mid-, and Long-Term Bariatric Surgery Outcomes

INTRODUCTION

Bariatric surgical outcomes depend heavily on proper healing of gastrointestinal anatomy, metabolic alterations, and patient lifestyle modifications which are all negatively impacted by immunosuppression and underlying inflammatory diseases. There is a lack of literature exploring how patients with diseases requiring immunosuppression respond to bariatric surgical intervention in the long term.

METHODS

A retrospective analysis of chronically immunosuppressed patients who underwent primary bariatric surgeries at Mayo Clinic was conducted (2008-2020). Data collected included patient demographics, BMI, underlying disease, and immunosuppression regimen and complications at 3, 6, 12, 24, and 60 months.

RESULTS

We identified a total of 89 (RYGB = 49, SG = 34, BPD/DS = 6) patients on chronic immunosuppression who underwent bariatric surgery at our center. RYGB (N = 49), 38.2% had a SG (N = 34) and 6.7% had a BPD/DS (N = 6). Rheumatoid arthritis and renal transplantation were the most underlying condition at 20.22% each (N = 18). There were a total of 2 (2.25%) intraoperative complications. In the immediate post-operative period, there were 15 (16.5%) minor complications. In follow-up, 6.1% of RYGB patients experienced marginal ulcerations, while no gastrointestinal leaks occurred. The mean pre-surgical BMI was 48.29 kg/m² (SD = 18.41). Percent total weight loss (%TWL) and BMI reduction were 30.89% and 14.83 kg/m² (SD = 9.07) at 12 months and 29.48% and 14.43 kg/m² (SD = 13.46) at 60 months, respectively. The mean follow-up time was 30.49 months.

CONCLUSIONS

Bariatric surgery remains safe and effective therapy for chronically immunosuppressed patients with excellent long-term outcomes for patients with moderate to severe obesity.

Increased incidence of marginal ulceration following conversion of sleeve gastrectomy to Roux-en-Y gastric bypass: a multi-institutional experience

BACKGROUND

Marginal ulcer (MU) formation is a serious complication following Roux-en-Y Gastric Bypass (RYGB). Incidental data suggested a higher incidence of MU following conversion of Sleeve Gastrectomy to RYGB (S-RYGB). Herein, we evaluate the incidence of MU after primary versus secondary RYGB.

METHODS

After IRB approval, each institution's electronic medical record and MBSAQIP database were queried to retrospectively identify adult patients who underwent primary RYGB (P-RYGB), Gastric Banding to RYGB (B-RYGB), or S-RYGB between 2014 and 2019, with minimum 1 year follow-up. Patient demographics, operative data, and post-operative outcomes were compared. Numeric variables were compared via two-sample t test, Wilcoxon test or Kruskal Wallis rank sum test. Two-sample proportion test or Fisher's exact test was employed for categorical and binary variables. p < 0.05 marked statistical significance.

RESULTS

748 patients underwent RYGB: P-RYGB n = 584 [78.1%]; B-RYGB n = 98 [13.1%]; S-RYGB n = 66 [8.8%]. Most patients were female (83.2%). Mean age was 45.7 years. Forty-six (n = 6.1%) patients developed MU, a median of 14 ± 32.2 months (range 0.5-82) post-operatively. Incidence of MU was significantly higher for patients undergoing S-RYGB (n = 9 [13.6%]), compared to P-RYGB (n = 34 [5.8%]) and B-RYGB (n = 3 [3.1%]) (p = 0.023). Median time (months) to MU was significantly shorter for patients who underwent S-RYGB (5 ± 6) compared to P-RYGB or B-RYGB (19 ± 37.5) (p = 0.035). Among those who developed MU, there was no significant difference in H. pylori status, NSAID, steroid, or tobacco use, irrespective of operation performed.

CONCLUSION

In this multi-institutional cohort, patients who underwent S-RYGB had a significantly higher incidence of MU than those with P-RYGB or B-RYGB. Further research is needed to elucidate its pathophysiology and prevention strategies.

Long-term complications after gastric bypass and sleeve gastrectomy: What information to give to patients and practitioners, and why?

Bariatric surgery is now recognized as the most effective treatment of morbid obesity, leading to durable weight loss and resolution of associated co-morbidities. Roux-en-Y gastric bypass and sleeve gastrectomy are the two most widely used operations today. However, potentially serious medical, surgical, and/or psychiatric complications can occur that raise questions regarding the benefits of this type of surgery. These complications can lead to surgical re-operations, iterative hospitalizations, severe nutritional deficiencies and psychological disorders. Indeed, death from suicide is said to be three times higher than in non-operated obese patients. These results are of concern, all the more because of the high prevalence of patients lost to follow-up (for various and multifactorial reasons) after bariatric surgery. However, better knowledge of post-surgical sequelae could improve the information provided to patients, the preoperative evaluation of the benefit/risk ratio, and, for patients undergoing surgery, the completeness and quality of follow-up as well as the detection and management of complications. The development of new strategies for postoperative follow-up such as telemedicine but also the mobilization of all the actors along the healthcare pathway can make inroads and warrant further study.

Why Size Matters: an Evaluation of Gastric Pouch Size in Roux-en-Y Gastric Bypass Using CT Volumetric Analysis and its Effect on Marginal Ulceration

PURPOSE

Marginal ulceration (MU) is a common long-term complication following Roux-en-Y gastric bypass (RYGB). The causes of MU after RYGB are multifactorial and include surgical technique of constructing the gastrojejunal anastomosis (GJA). The purpose of this study is to evaluate the relationship between gastric pouch size in RYGB and MU using CT volumetrics.

MATERIAL AND METHODS

Patients were retrospectively identified who underwent esophagogastroduodenoscopy (EGD) following RYGB at a tertiary care teaching hospital. Measurement of gastric pouch size was performed using 3-D CT software. Standard statistical methods were used, a univariate comparison was performed between MU and non-MU patients followed by a propensity-matched comparison to control for factors known to affect MU, and a propensity-matched subgroup analysis was also performed.

RESULTS

In total, 122 patients met criteria, 57 of which had MU on EGD and 65 who did not. The MU group had more smokers and patients with PPI use than the non-MU group, and the mean time from operation to CT scan was 26.6 months (range: 0-108 months). The MU group had a larger gastric pouch size than the non-MU group (34.1 ± 11.8 versus 20.1 ± 6.8 cm³). When analyzed for matched patient cohorts, this difference remained for the MU group that included smokers and PPI use. When stratified for pouch size, for each 5 cm³ increase in pouch size, patients had 2.4 times odds increase of MU formation.

CONCLUSIONS

CT volumetric analysis demonstrated that a larger gastric pouch size was associated with MU following RYGB.

Management of Postoperative Complications Following Bariatric and Metabolic Procedures

Bariatric and metabolic surgery is a safe and effective treatment of morbid obesity, a disease that continues to increase in prevalence in the United States and worldwide. The two most commonly performed operations are the sleeve gastrectomy and the gastric bypass. Early and late complications can occur, and although referral to a bariatric surgeon or center is ideal, emergency management of acute problems is relevant to all general surgeons. Bariatric surgery can have surgical and metabolic consequences. An understanding of the altered anatomy and physiology helps to guide management of morbidities. This article discusses surgical postoperative complications and metabolic complications.

The Choice of Gastric Bypass or Sleeve Gastrectomy for Patients Stratified by Diabetes Duration and Body Mass Index (BMI) level: Results from a National Registry and Meta-analysis

PURPOSE

To determine whether sleeve gastrectomy (SG) or Roux-en-Y gastric bypass (RYGB) should be the optimal choice in patients stratified by diabetes duration and body mass index (BMI) level.

METHODS

Classification tree analysis was performed to identify the influential factors for surgical procedure selection in real setting. Meta-analyses stratified by influential factors were conducted to compare the complete diabetes remission rates between SG and RYGB. The cost-effectiveness analysis was performed when results from meta-analysis remain uncertain.

RESULTS

Among 3198 bariatric procedures in China, 824 (73%) SGs and 191 (17%) RYGBs were performed in patients with T2DM. Diabetes duration with a cutoff value of 5 years and BMI level with 35.5 kg/m² were identified as the influential factors. For patients with diabetes duration > 5 years, RYGB showed a significant higher complete diabetes remission rate than SG at 1 year: 0.52 (95% confidence interval (CI): 0.46-0.58) versus 0.36 (95% CI: 0.30-0.42). For patients with diabetes duration ≤ 5 years and BMI ≥ 35.5 kg/m², there was no significant difference between 2 procedures: 0.57 (95% CI: 0.43-0.71) for SG versus 0.66 (95% CI: 0.62-0.70) for RYGB. The cost-effectiveness ratios of SG and RYGB were 244.58 and 276.97 dollars per QALY, respectively.

CONCLUSIONS

For patients with diabetes duration > 5 years, RYGB was the optimal choice with regard to achieving complete diabetes remission at 1 year after surgery. However, for patients with diabetes duration ≤ 5 years and BMI ≥ 35.5 kg/m², SG appeared to provide a cost-effective choice.

Incidence and Prognostic Factors for the Development of Symptomatic and Asymptomatic Marginal Ulcers After Roux-en-Y Gastric Bypass Procedures

INTRODUCTION

Marginal ulcer (MU) is a serious complication after Roux-en-Y gastric bypass (RYGB) procedures. This study reports the incidence, risk factors, and treatment outcomes of symptomatic and incidentally, at routine endoscopy diagnosed, MU.

METHODS

All patients undergoing RYGB procedures between 2013 and 2018 at a single center were included. Upper endoscopy was performed in case of symptoms and/or routinely 2 and 5 years postoperatively.

RESULTS

In total, 568 patients (83.3% female) underwent RYGB procedure with a median age of 40 years and median initial body mass index of 41 kg/m². The median time to follow-up was 2.99 years. Routine 2- and 5-year upper endoscopy was performed in 256 (55.3%) and 65 (38.0%) eligible patients, respectively. In 86 (15.1%) patients, MU was diagnosed at a median time of 14.2 months (4.58-26.2) postoperatively and 24.4% of patients with MU were asymptomatic. In total, 76.7% of MUs were located on the side of the Roux limb. 88.4% of MUs were treated conservatively; re-operation was necessary in 10 (11.6%) patients. Smoking and type 2 diabetes mellitus were the only independent risk factors for MU development in multivariate analysis with a hazard ratio of 2.65 and 1.18 (HbA1c per unit >6.0), respectively.

CONCLUSION

MU is a common complication after gastric bypass surgery with 25% of patients being asymptomatic. Follow-up routine endoscopy is recommended for early MU detection and subsequent accurate therapy, especially in patients with the independent risk factors smoking and type 2 diabetes mellitus.

Areas of Non-Consensus Around One Anastomosis/Mini Gastric Bypass (OAGB/MGB): A Narrative Review

PURPOSE

One anastomosis/mini gastric bypass (OAGB/MGB) is now an established bariatric and metabolic surgical procedure with good outcomes. Despite two recent consensus statements around OAGB/MGB, there are some issues which are not accepted as consensus and need more long-term data and research.

MATERIAL AND METHODS

After identifying the topic of non-consensus from the two recent OAGB/MGB consensuses, PubMed, Scopus, and Cochrane were searched for articles published by November 2020.

RESULTS

In this study, we evaluated these non-consensus topics around OAGB/MGB and all related articles on these topics were assessed by authors to have an argument on these items.

CONCLUSION

There is enough evidence to include OAGB/MGB as an accepted standard bariatric and metabolic surgical procedure. However, long-term data and more research are needed to have a consensus in all aspects including these non-consensus topics.

Comparing patterns of care and outcomes after operative management of complications after bariatric surgery at MBSAQIP accredited bariatric centers and non-bariatric facilities

BACKGROUND

Many operations for complications after bariatric surgery are performed by surgeons without bariatric expertise at centers without teams who routinely care for bariatric patients. This study sought to evaluate whether bariatric expertise affects patterns of care and perioperative outcomes among patients undergoing operative intervention for complications after bariatric surgery.

METHODS

Administrative claims data from the Kentucky Office of Health Policy were queried for inpatients undergoing operative intervention for complications related to bariatric surgery between 2015 and 2018. Patients were stratified with respect to whether or not they underwent surgery at a Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program (MBSAQIP) accredited bariatric surgery center (BCE) or not (non-BCE). Groups were compared with respect to demographic, procedural, and outcome variables.

RESULTS

BCE patients were more often Caucasian than non-BCE patients (p < 0.001) and have either private insurance or Medicare coverage (p = 0.02). Regarding operative approach, operations were more likely to be performed laparoscopically in BCE (88.5% BCE vs. 80.9% non-BCE, p = 0.007). Length of stay was significantly shorter for BCE patients (median 2 days BCE vs. 3 days non-BCE, p < 0.001), and BCE patients were more likely to be discharged home (85.4% BCE vs. 78.5% non-BCE, p = 0.02). Inpatient mortality and average total charges per patient did not differ significantly between the two groups CONCLUSIONS: Surgical management of complications after bariatric surgery at BCE is associated with greater utilization of minimally invasive techniques, shorter hospital stay, and increased likelihood of routine home discharge. These findings should prompt a review and standardization of care patterns for patients with complications after bariatric surgery aimed at optimizing outcomes and improving value.

Low Risk for Marginal Ulcers in Duodenal Switch and Gastric Bypass in a Well-Defined Cohort of 472 Patients

PURPOSE

Marginal ulcer (MU) is well-known complication in bariatric surgery. Several studies are available in Roux-en-Y gastric bypass (RYGBP), while data on the incidence in duodenal switch (DS) is limited. We aimed to compare the incidence of MU between DS and RYGBP in a well-defined cohort and to identify associative factors.

METHODS

A cohort of 732 patients with BMI ≥ 48 who had undergone primary DS or RYGBP during 2008-2018 received a questionnaire concerning ulcers, PPI therapy, and smoking habits; hereafter, patient charts were reviewed. Incidence rates (IRs) for MU were calculated in our survey and on previous registered data in the national quality register for bariatric surgery (SOReg). A multivariate regression analysis was performed to identify predictive risk factors for MU.

RESULTS

After a mean follow-up of 6.1 years, 472 (64%) patients responded (47 ± 11 years old, 65% women and 42% DS). Of 41 MUs identified, 23 were endoscopically verified. Gastrointestinal bleeding, abdominal pain, and dysphagia were the most common symptoms. IR for MU was 1.4% (DS 1.3% and RYGBP 1.5%) per patient-year, compared with 0.9% according to SOReg-data. Persisting PPI treatment was seen in about three quarter of former MU patients (OR 11.2 [3.6-34.7], p < 0.001), but no other associative factors were found.

CONCLUSION

The overall risk for MU was low, about 1% per patient-year, without difference between DS and RYGBP. Ongoing PPI treatment was frequent in many former MU patients. This study on MU after DS provides reassuring results for future bariatric surgery candidates.