Prevalence and Risk Factors for Chronic Abdominal Pain After Roux-en-Y Gastric Bypass Surgery: A Cohort Study

Gallstone in the gastric remnant after bariatric surgery

In the last decades, bariatric surgery has been widely performed to treat obesity and its co-morbidities, with the laparoscopic Roux-en-Y gastric bypass (LRYGB) being the second most commonly performed procedure. Abdominal pain after LRYGB is a common symptom. This report concerns a case of a rare cause of chronic abdominal pain after LRYGB and cholecystectomy in a 48-year-old woman due to a cholesterol stone within the gastric remnant that was removed via open gastrectomy. This is the first documented case of cholesterol stone formation in the gastric remnant and underscores the importance of vigilance for atypical complications in patients undergoing bariatric procedures.

Risk Factors for Chronic Abdominal Pain After RYGB: Are Patients Adequately Selected Beforehand?

PURPOSE

Chronic abdominal pain after RYGB is a known issue. Identifying the potential patient-related and modifiable risk factors might contribute to diminish the risk for this undesirable outcome.

METHODS

A single-center retrospective cohort study with prospective data collection was conducted with inclusion of all patients who underwent RYGB surgery between 2015 and 2021. Data from the NBSR and medical records were used. Patients with chronic abdominal pain were defined when pain lasting or recurring for more than 3 to 6 months.

RESULTS

Six hundred sixty-four patients who underwent RYGB surgery were included with a median follow-up of 60.5 months. Forty-nine patients (7.3%) presented with chronic abdominal pain. Postoperative complications (OR 13.376, p = 0.020) and diagnosis of depression (OR 1.971, p = 0.037) were associated with developing abdominal pain. On the other hand, ex-smokers (OR 0.222, p = 0.040) and older age (0.959, p = 0.004) presented as protective factors.

CONCLUSION

Postoperative complications and diagnosis of depression are risk factors for chronic pain after RYGB. The role of the bariatric MDT remains crucial to select these patients adequately beforehand.

The burden of abdominal pain after bariatric surgery in terms of diagnostic testing: the OPERATE study

BACKGROUND

Abdominal pain after bariatric surgery (BS) is frequently observed. Despite numerous diagnostic tests, the cause of abdominal pain is not always found.

OBJECTIVES

To quantify type and number of diagnostic tests performed in patients with abdominal pain after BS and evaluate the burden and their yield in the diagnostic process.

SETTING

A bariatric center in the Netherlands.

METHODS

In this prospective study, we included patients who presented with abdominal pain after BS between December 1, 2020, and December 1, 2021. All diagnostic tests and reoperations performed during one episode of abdominal pain were scored using a standardized protocol.

RESULTS

A total of 441 patients were included; 401 (90.9%) were female, median time after BS was 37.0 months (IQR, 11.0-66.0) and mean percentage total weight loss was 31.41 (SD, 10.53). In total, 715 diagnostic tests were performed, of which 355 were abdominal CT scans, 155 were ultrasounds, and 106 were gastroscopies. These tests yielded a possible explanation for the pain in 40.2% of CT scans, 45.3% of ultrasounds, and 34.7% of gastroscopies. The diagnoses of internal herniation, ileus, and nephrolithiasis generally required only 1 diagnostic test, whereas patients with anterior cutaneous nerve entrapment syndrome, irritable bowel syndrome, and constipation required several tests before diagnosis. Even after several negative tests, a diagnosis was still found in the subsequent test: 86.7% of patients with 5 or more tests had a definitive diagnoses. Reoperations were performed in 37.2% of patients.

CONCLUSION

The diagnostic burden in patients with abdominal pain following BS is high. The most frequently performed diagnostic test is an abdominal CT scan, yielding the highest number of diagnoses in these patients.

Mechanisms inherent in acute-to-chronic pain after surgery - risk, diagnostic, predictive, and prognostic factors

PURPOSE OF REVIEW

Pain is an expected consequence of a surgery, but it is far from being well controlled. One major complication of acute pain is its risk of persistency beyond healing. This so-called chronic post-surgical pain (CPSP) is defined as new or increased pain due to surgery that lasts for at least 3 months after surgery. CPSP is frequent, underlies a complex bio-psycho-social process and constitutes an important socioeconomic challenge with significant impact on patients' quality of life. Its importance has been recognized by its inclusion in the eleventh version of the ICD (International Classification of Diseases).

RECENT FINDINGS

Evidence for most pharmacological and non-pharmacological interventions preventing CPSP is inconsistent. Identification of associated patient-related factors, such as psychosocial aspects, comorbidities, surgical factors, pain trajectories, or biomarkers may allow stratification and selection of treatment options based on underlying individual mechanisms. Consequently, the identification of patients at risk and implementation of individually tailored, preventive, multimodal treatment to reduce the risk of transition from acute to chronic pain is facilitated.

SUMMARY

This review will give an update on current knowledge on mechanism-based risk, prognostic and predictive factors for CPSP in adults, and preventive and therapeutic approaches, and how to use them for patient stratification in the future.

A Prospective Study on the Diagnoses for Abdominal Pain After Bariatric Surgery: The OPERATE Study

PURPOSE

Long-term follow-up after bariatric surgery (BS) reveals high numbers of patients with abdominal pain that often remains unexplained. The aim of this prospective study was to give an overview of diagnoses for abdominal pain, percentage of unexplained complaints, number and yield of follow-up visits, and time to establish a diagnosis.

MATERIALS AND METHODS

Patients who visited the Spaarne Gasthuis Hospital, The Netherlands, between December 2020 and December 2021 for abdominal pain after BS, were eligible and followed throughout the entire episode of abdominal pain. Distinction was made between presumed and definitive diagnoses.

RESULTS

The study comprised 441 patients with abdominal pain; 401 (90.9%) females, 380 (87.7%) had Roux-en-Y gastric bypass, mean (SD) % total weight loss was 31.4 (10.5), and median (IQR) time after BS was 37.0 (11.0-66.0) months. Most patients had 1-5 follow-up visits. Readmissions and reoperations were present in 212 (48.1%) and 164 (37.2%) patients. At the end of the episode, 88 (20.0%) patients had a presumed diagnosis, 183 (41.5%) a definitive diagnosis, and 170 (38.5%) unexplained complaints. Most common definitive diagnoses were cholelithiasis, ulcers, internal herniations, and presumed diagnoses irritable bowel syndrome (IBS), anterior cutaneous nerve entrapment syndrome, and constipation. Median (IQR) time to presumed diagnoses, definitive diagnoses, or unexplained complaints was 16.0 (3.8-44.5), 2.0 (0.0-31.5), and 13.5 (1.0-53.8) days (p < 0.001). Patients with IBS more often had unexplained complaints (OR 95%CI: 4.457 [1.455-13.654], p = 0.009). At the end, 71 patients (16.1%) still experienced abdominal pain.

CONCLUSION

Over a third of abdominal complaints after BS remains unexplained. Most common diagnoses were cholelithiasis, ulcers, and internal herniations.

Abdominal Pain After Roux-en-Y Gastric Bypass: A Review

Importance

Roux-en-Y gastric bypass (RYGB) remains one of the most commonly performed operations for morbid obesity and is associated with significant long-term weight loss and comorbidity remission. However, health care utilization rates following RYGB are high and abdominal pain is reported as the most common presenting symptom for those seeking care.

Observations

Given the limitations of physical examination in patients with obesity, correct diagnosis of abdominal pain following RYGB depends on a careful history and appropriate use of radiologic, laboratory and endoscopic studies, as well as a clear understanding of post-RYGB anatomy. The most common etiologies of abdominal pain after RYGB are internal hernia, marginal ulcer, biliary disease (eg, cholelithiasis and choledocholithiasis), and jejunojejunal anastomotic issues. Early identification of the etiology of the pain is essential, as some causes, such as internal hernia or perforated gastrojejunal ulcer, may require urgent or emergent intervention to avoid significant morbidity. While laboratory findings and imaging may prove useful, they remain imperfect, and clinical judgment should always be used to determine if surgical exploration is warranted.

Conclusions and Relevance

The etiologies of abdominal pain after RYGB range from the relatively benign to potentially life-threatening. This Review highlights the importance of understanding key anatomical and technical aspects of RYGB to guide appropriate workup, diagnosis, and treatment.

Chronic abdominal pain and quality of life after Roux-en-Y gastric bypass and sleeve gastrectomy - a cross-cohort analysis of two prospective longitudinal observational studies

BACKGROUND

Chronic abdominal pain (CAP) after bariatric surgery is not extensively explored and may impact the postoperative outcomes.

OBJECTIVE

To compare the prevalence of patient-reported chronic abdominal pain (CAP) after Roux-en-Y gastric bypass (RYGB) and sleeve gastrectomy (SG). Secondarily, we compared other abdominal and psychological symptoms and quality of life (QoL). Preoperative predictors of postoperative CAP were also explored.

SETTING

Tertiary referral centers for bariatric surgery in Norway.

METHODS

Analyses of 2 separate prospective longitudinal cohort studies evaluating CAP, abdominal and psychological symptoms and QoL before and 2 years after RYGB and SG.

RESULTS

Follow-ups were attended by 416 patients (85.8%), 300/416 (72.1%) were females and 209/416 (50.2%) were RYGB procedures. At follow-up, the mean age was 44.9 (10.0) years, BMI 29.5 (5.4) kg/m2, and total weight loss 31.6 (10.3) %. The prevalence of CAP was 28/236 (11.9%) before and 60/209 (28.7%) after RYGB (P < .001) and 32/223 (14.3%) before and 50/186 (26.9%) after SG (P < .001). Gastrointestinal symptom rating scale scores showed greater deterioration of diarrhea and indigestion after RYGB and reflux after SG. The improvement in depression symptoms was greater after SG, as well as several QoL scores improved more after SG. Patients with CAP after RYGB experienced deterioration in several QoL scores, while these scores improved in patients with CAP after SG. Preoperative hypertension, bothersome reflux symptoms, and CAP predicted postoperative CAP.

CONCLUSIONS

The prevalence of CAP increased comparably after RYGB and SG, with worsening of gastroesophageal reflux after SG and greater deterioration of diarrhea and indigestion after RYGB. In patients with CAP at follow-up, several QoL scores improved more after SG than RYGB.

Long-term Safety and Efficacy of Closure of Mesenteric Defects in Laparoscopic Gastric Bypass Surgery: A Randomized Clinical Trial

Importance

Short-term and midterm data suggest that mesenteric defects closure during laparoscopic Roux-en-Y gastric bypass (LRYGB) surgery reduces the risk of internal herniation with small bowel obstruction (SBO) but may increase risk of kinking of the jejunojejunostomy in the early postoperative period. However, to our knowledge, there are no clinical trials reporting long-term results from this intervention in terms of risk for SBO or opioid use.

Objective

To evaluate long-term safety and efficacy outcomes of closure of mesenteric defects during LRYGB.

Design, Setting, and Participants

This randomized clinical trial with a 2-arm, parallel, open-label design included patients with severe obesity scheduled for LRYGB bariatric surgery at 12 centers in Sweden from May 1, 2010, through November 14, 2011, with 10 years of follow-up after the intervention.

Interventions

During the operation, patients were randomly assigned 1:1 to closure of mesenteric defects beneath the jejunojejunostomy and at the Petersen space using nonabsorbable running sutures during LRYGB or to nonclosure.

Main Outcome and Measures

The primary outcome was reoperation for SBO. New incident, chronic opioid use was a secondary end point as a measure of harm.

Results

A total of 2507 patients (mean [SD] age, 41.7 [10.7] years; 1863 female [74.3%]) were randomly assigned to closure of mesenteric defects (n = 1259) or nonclosure (n = 1248). After censoring for death and emigration, 1193 patients in the closure group (94.8%) and 1198 in the nonclosure group (96.0%) were followed up until the study closed. Over a median follow-up of 10 years (IQR, 10.0-10.0 years), a reoperation for SBO from day 31 to 10 years after surgery was performed in 185 patients with nonclosure (10-year cumulative incidence, 14.9%; 95% CI, 13.0%-16.9%) and in 98 patients with closure (10-year cumulative incidence, 7.8%; 95% CI, 6.4%-9.4%) (subhazard ratio [SHR], 0.42; 95% CI, 0.32-0.55). New incident chronic opioid use was seen among 175 of 863 opioid-naive patients with nonclosure (10-year cumulative incidence, 20.4%; 95% CI, 17.7%-23.0%) and 166 of 895 opioid-naive patients with closure (10-year cumulative incidence, 18.7%; 95% CI, 16.2%-21.3%) (SHR, 0.90; 95% CI, 0.73-1.11).

Conclusions and Relevance

This randomized clinical trial found long-term reduced risk of SBO after mesenteric defects closure in LRYGB. The findings suggest that routine use of this procedure during LRYGB should be considered.

Trial Registration

ClinicalTrials.gov Identifier: NCT01137201.

Chronic abdominal pain after bariatric surgery: a narrative review

Objective: This paper reviews the prevalence, etiology, risk factors, diagnosis and prevention of chronic abdominal pain after bariatric surgery. Introduction: Chronic pain is a very common and complex problem that has serious consequences on individuals and society. It frequently presents as a result of a disease or an injury. Obesity and obesity-related comorbidities are a major health problem and are dramatically increasing year after year. Dieting and physical exercise show disappointing results in the treatment of obesity. Therefore, bariatric surgery is increasingly widely offered as a weight reducing strategy. In our pain clinic we see a lot of patients who suffer from chronic abdominal pain after bariatric surgery. This review aims to explore the link between chronic abdominal pain and bariatric surgery in this specific type of patients. Method: The review is based on searches in PubMed, Embase and Cochrane databases. Keywords are used in different combinations. We did a cross-reference of the articles included. Results: Chronic abdominal pain after bariatric surgery is very common. Around 30% of the bariatric patients experience persistent abdominal pain. An explanation for the abdominal pain is found in 2/3 of these patients. There is a wide variety of causes including behavioral and nutritional disorders, functional motility disorders, biliary disorders, marginal ulceration and internal hernia. Another, frequently overlooked, cause is abdominal wall pain. Unexplained abdominal pain after bariatric surgery is present in 1/3 of the patients with persistent abdominal pain. More studies are needed on the risk factors and prevention of unexplained abdominal pain in bariatric patients.

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.

Long Term Outcomes after Laparoscopic Assisted Trans-Gastric Endoscopic Retrograde Cholangiopancreatography

Background:

The gastric bypass is a commonly performed bariatric procedure. The stomach is divided into a small pouch as well as leaving a larger remnant that is bypassed by the gastrojejunal anastomosis. This makes access to the biliary system difficult as an endoscope cannot transverse the esophagus, roux limb, and biliopancreatic limb. Therefore, a transgastric approach (endoscopic retrograde cholangiopancreatography [t-ERCP]) through the abdominal wall and remnant stomach is necessary. This involves the surgical team providing access to the remnant stomach for the gastroenterologist to perform the t-ERCP. We have performed a number of these for biliary pathology that ranges from cancer to retained gallstones. We evaluated these patients with at least a 3-year follow-up to determine long term outcomes.

Methods:

We conducted a chart review of patients who underwent a t-ERCP with at least a 3-year follow-up. We collected de-identified data including demographics, operative details, complications, and postoperative courses.

Results:

There were 12 patients who underwent t-ERCP. Eleven patients had at least a 3-year follow-up with a mean follow-up of 68.1 months (excluding one death from pancreatic cancer). The most common pathology was benign biliary stricture (n = 6), followed by retained gallstones (n = 4), with one pancreatic cancer, and one normal examination. Two patients still had epigastric pain at long term follow-up after 3 years.

Conclusion:

T-ERCP is safe and efficacious with good long-term results.

A prospective longitudinal study of chronic abdominal pain and symptoms after sleeve gastrectomy

BACKGROUND

Sleeve gastrectomy (SG) is widely applied. Few studies have evaluated patient-reported abdominal symptoms after SG.

OBJECTIVE

To evaluate the prevalence of chronic abdominal pain (CAP) and symptom characteristics after SG.

SETTING

Oslo University Hospital and Voss Hospital.

METHODS

We performed a longitudinal prospective cohort study of patients operated on with SG at two tertiary referral centers. For broad assessments of abdominal pain and symptoms, consultations were performed and questionnaires retrieved before and 2 years after SG. The definition of CAP or recurrent abdominal pain lasting for more than 3 months was sustained. Preoperative predictors of CAP were explored.

RESULTS

Of 249 patients at baseline, 207 (83.1%) had follow-up consultations. Mean preoperative body mass index was 43.9 (6.0) kg/m², and 181 patients (72.7%) were female. Total weight loss was 31.9% (10.4%). CAP was reported in 32 of 223 patients (14.3%) before and in 50 of 186 patients (26.9%) after SG (P =.002). All mean gastrointestinal symptoms rating scale questionnaire scores increased after SG, and they were higher in patients with CAP. Symptoms of depression decreased but were more prevalent in patients with CAP at follow-up. Most quality-of-life scores increased after SG. However, patients with CAP had lower scores (except for physical functioning). Preoperative bothersome Gastrointestinal Symptom Rating Scale reflux symptoms, study center, and younger age seemed to predict CAP after SG.

CONCLUSION

The prevalence of patient-reported CAP increased after SG. Patients reporting CAP had reduced quality-of-life scores.

Long-term Emergency Department Visits and Readmissions After Laparoscopic Roux-en-Y Gastric Bypass: a Systematic Review

PURPOSE

There is considerable evidence on short-term outcomes after laparoscopic Roux-en-Y gastric bypass (LRYGB), but data on long-term outcome is scarce, especially on postoperative emergency department (ED) visits and readmissions. We aim to systematically review evidence on the incidence, indications, and risk factors of ED visits and readmissions beyond 30 days after LRYGB.

MATERIALS AND METHODS

A systematic search in PubMed, Scopus, Embase.com , Cochrane Library, and PsycINFO was performed. All studies reporting ED visits and readmissions > 30 days after LRYGB, with ≥ 50 patients, were included. PRISMA statement was used and the Newcastle-Ottawa Scale for quality assessment.

RESULTS

Twenty articles were included. Six studies reported on ED visits (n = 2818) and 19 on readmissions (n = 276,543). The rate of patients with an ED visit within 90 days after surgery ranged from 3.9 to 32.6%. ED visits at 1, 2, and 3 years occurred in 25.6%, 30.0%, and 31.1% of patients. Readmissions within 90 days and at 1-year follow-up ranged from 4.1 to 20.5% and 4.75 to 16.6%, respectively. Readmission was 29% at 2 years and 23.9% at 4.2 years of follow-up. The most common reason for ED visits and readmissions was abdominal pain.

CONCLUSION

Emergency department visits and readmissions have been reported in up to almost one in three patients on the long-term after LRYGB. Both are mainly indicated for abdominal pain. The report on indications and risk factors is very concise. A better understanding of ED visits and readmissions after LRYGB is warranted to improve long-term care, in particular for patients with abdominal pains.

One Anastomosis Gastric Bypass in Patients with Gastrooesophageal Reflux Disease and/or Hiatus Hernia

INTRODUCTION

One anastomosis gastric bypass (OAGB) offers favourable weight loss outcomes and is associated with reduced morbidity and mortality when compared to other mainstream bariatric procedures. However, a randomised trial reported a conversion rate to roux-en-Y configuration (RYC) of 3.1%, and some surgeons consider the procedure unsuitable for patients with a preoperative hiatus hernia (HH) or symptoms of gastrooesophageal reflux disease (GORD).

METHODS

We carried out a retrospective review of patients undergoing OAGB in our institution. Included were all patients on PPI for symptoms of GORD preoperatively, as well as patients with HH or oesophagitis on preoperative endoscopy. We recorded GORD outcomes as well as rates of conversion to RYC in patients.

RESULTS

Medium term follow up data at 23-28 months was available for 89 patients. Of these, 63 had HH, 34 had preoperative GORD requiring PPI and 9 had confirmed oesophagitis. The conversion rate to RYC was nil (0/63) in patients with HH. At the same time, 14.7% (5/34) of patients with preop GORD on PPI required conversion to RYC at a median time interval of 16 months. In patients already on PPI preoperatively, 16/34 (47.1%) needed to continue on PPI long term. In patients with HH, 20.6% (13/63) suffered de novo GORD symptoms.

CONCLUSION

OAGB can be offered to patients with HH with acceptable GORD outcomes but caution is advised in patients with preoperative GORD symptoms. Larger prospective and randomised studies are required to further assess this subgroup.

BODY-Q patient-reported outcomes measure (PROM) to assess sleeve gastrectomy vs. Roux-en-Y gastric bypass: eating behavior, eating-related distress, and eating-related symptoms

BACKGROUND

Post-operative changes in eating behavior, eating-related distress and eating-related symptoms play an important role in the lives of bariatric surgery patients. However, there are no studies that assess these outcomes using a specifically designed patient-reported outcome measure (PROM) for patients undergoing bariatric surgery. We use our newly developed and validated scales as part of the well-established BODY-Q PROMs to compare laparoscopic sleeve gastrectomy (LSG) and laparoscopic Roux-en-Y gastric bypass patients (LRYGB).

METHODS

We analyzed data from an international multi-center prospective cohort study of patients over 18 who underwent bariatric surgery. We used multivariable linear regression models to assess the difference between LRYGB and LSG for the new BODY-Q scales, which include eating behavior, eating-related distress and eating-related symptoms. All analyses were corrected for significant confounding variables.

RESULTS

Out of 1420 patients, 920 underwent LRYGB and 500 underwent LSG. The LRYGB group had a higher percentage total weight loss (p < 0.001). There was no significant difference in eating behavior (e.g., stop eating before feeling full, avoiding unhealthy snacks, etc.) or eating-related distress (e.g., feeling ashamed or out of control after eating). Patients who underwent LSG scored significantly better on the post-prandial eating-related symptoms scale (e.g., vomiting, reflux; p < 0.001). Symptoms more prevalent in the LRYGB patients were related to dumping syndrome whereas symptoms more prevalent in LSG patients were related to reflux.

CONCLUSION

Patients who underwent LRYGB had a significantly better weight loss after surgery, but they scored worse on post-prandial symptoms in comparison to LSG patients. This information may be relevant for patients in the pre-operative counseling setting, as it may influence their decision for surgical procedure selection.

Randomized Controlled Trial of One Anastomosis Gastric Bypass Versus Roux-En-Y Gastric Bypass for Obesity: Comparison of the YOMEGA and Taiwan Studies

BACKGROUND

The YOMEGA study (Y-study) was a randomized trial comparing one anastomosis gastric bypass (OAGB) and Roux-en-Y gastric bypass (RYGB). Here, we aim to compare the Y-study and our pioneer trial from Taiwan (T-study).

METHODS

Data from the Y-study and the T-study were collected and compared.

RESULTS

The Y-study recruited 234 patients with a mean body mass index (BMI) of 43.9 and age of 43.5 years. The T-study recruited 80 patients with a similar mean BMI of 44.3 and mean age of 31.4 years. The studies had similar findings including (1) OAGB is easier and possibly safer procedure than RYGB. Both studies showed that OAGB had a shorter operation time than RYGB, but a lower surgical complication rate was only demonstrated in T-study. (2) Both procedures have similar weight loss but OAGB features better glycemic control than RYGB. Weight loss at 2 years after surgery was similar between two procedures, but OAGB reduced HbA1c to a greater degree than RYGB at 2 years in Y-study (- 2.3% vs. - 1.3%; p = 0.025). The resolution of the metabolic syndrome was 100% for both groups in the T-study. (3) OAGB carried a higher risk of malnutrition. OAGB had more malabsorptive problems with a lower hemoglobin level than RYGB at 2 years after surgery. Adverse malnutrition events occurred in nine (7.8%) OAGB patients in the Y-study. Four (3.4%) patients of OAGB received revision surgery in Y-study but none in T-study. (4) Bile reflux was noted in OAGB patients but did not influence quality of life or revision rate. Y-study found that bile in the gastric pouch was present in 16% of patients in the OAGB group versus none in the RYGB, but no inter-group difference in quality of life was detected. There was a trend for RYGB patients to experience more abdominal pain than OAGB.

CONCLUSIONS

Both studies showed that OAGB is a technically easier procedure and features better glycemic control than RYGB, but has a mal-absorptive effect. However, the bile reflux and abdominal pain controversies persisted.