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1.	Cao, Yang, Associate Professor, 1972-, et al. (författare) Using a Convolutional Neural Network to Predict Remission of Diabetes After Gastric Bypass Surgery : Machine Learning Study From the Scandinavian Obesity Surgery Register 2021 Ingår i: JMIR Medical Informatics. - : JMIR Publications. - 2291-9694. ; 9:8 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Prediction of diabetes remission is an important topic in the evaluation of patients with type 2 diabetes (T2D) before bariatric surgery. Several high-quality predictive indices are available, but artificial intelligence algorithms offer the potential for higher predictive capability.OBJECTIVE: This study aimed to construct and validate an artificial intelligence prediction model for diabetes remission after Roux-en-Y gastric bypass surgery.METHODS: Patients who underwent surgery from 2007 to 2017 were included in the study, with collection of individual data from the Scandinavian Obesity Surgery Registry (SOReg), the Swedish National Patients Register, the Swedish Prescribed Drugs Register, and Statistics Sweden. A 7-layer convolution neural network (CNN) model was developed using 80% (6446/8057) of patients randomly selected from SOReg and 20% (1611/8057) of patients for external testing. The predictive capability of the CNN model and currently used scores (DiaRem, Ad-DiaRem, DiaBetter, and individualized metabolic surgery) were compared.RESULTS: In total, 8057 patients with T2D were included in the study. At 2 years after surgery, 77.09% achieved pharmacological remission (n=6211), while 63.07% (4004/6348) achieved complete remission. The CNN model showed high accuracy for cessation of antidiabetic drugs and complete remission of T2D after gastric bypass surgery. The area under the receiver operating characteristic curve (AUC) for the CNN model for pharmacological remission was 0.85 (95% CI 0.83-0.86) during validation and 0.83 for the final test, which was 9%-12% better than the traditional predictive indices. The AUC for complete remission was 0.83 (95% CI 0.81-0.85) during validation and 0.82 for the final test, which was 9%-11% better than the traditional predictive indices.CONCLUSIONS: The CNN method had better predictive capability compared to traditional indices for diabetes remission. However, further validation is needed in other countries to evaluate its external generalizability.
2.	Gryth, Karin, et al. (författare) The Influence of Socioeconomic Factors on Quality-of-Life After Laparoscopic Gastric Bypass Surgery 2019 Ingår i: Obesity Surgery. - : Springer. - 0960-8923 .- 1708-0428. ; 29:11, s. 3569-3576 Tidskriftsartikel (refereegranskat)abstract Introduction: Patients with low socioeconomic status have been reported to experience poorer outcome after several types of surgery. The influence of socioeconomic factors on health-related quality-of-life (HRQoL) after bariatric surgery is unclear.Materials and Methods: Patients operated with a primary laparoscopic gastric bypass procedure in Sweden between 2007 and 2015 were identified in the Scandinavian Obesity Surgery Register. Patients with a completed assessment of health-related quality-of-life based on the Obesity-related Problem Scale (OP Scale) were included in the study. Socioeconomic status was based on data from Statistics Sweden.Results: A total of 13,723 patients (32% of the 43,096 operated during the same period), with complete OP scores at baseline and two years after surgery, were included in the study. Age, lower preoperative BMI, male gender, higher education, professional status and disposable income as well as not receiving social benefits (not including retirement pension), and not a first- or second-generation immigrant, were associated with a higher postoperative HRQoL. Patients aged 30-60 years, with lower BMI, higher socioeconomic status, women and those born in Sweden by Swedish parents experienced a higher degree of improvement in HRQoL. Postoperative weight-loss was associated with higher HRQoL (unadjusted B 16.3, 95%CI 14.72-17.93, p < 0.0001).Conclusion: At 2 years, a strong association between weight loss and improvement in HRQoL was seen, though several factors influenced the degree of improvement. Age, sex, preoperative BMI and socioeconomic status all influence the postoperative HRQoL as well as the improvement in HRQoL after laparoscopic gastric bypass surgery.
3.	Hedberg, Suzanne, et al. (författare) Comparison of Sleeve Gastrectomy vs Roux-en-Y Gastric Bypass : A Randomized Clinical Trial 2024 Ingår i: JAMA Network Open. - : American Medical Association (AMA). - 2574-3805. ; 7:1 Tidskriftsartikel (refereegranskat)abstract IMPORTANCE: Laparoscopic sleeve gastrectomy (SG) and laparoscopic Roux-en-Y gastric bypass (RYGB) are widely used bariatric procedures for which comparative efficacy and safety remain unclear.OBJECTIVE: To compare perioperative outcomes in SG and RYGB.DESIGN, SETTING, AND PARTICIPANTS: In this registry-based, multicenter randomized clinical trial (Bypass Equipoise Sleeve Trial), baseline and perioperative data for patients undergoing bariatric surgery from October 6, 2015, to March 31, 2022, were analyzed. Patients were from university, regional, county, and private hospitals in Sweden (n = 20) and Norway (n = 3). Adults (aged ≥18 years) eligible for bariatric surgery with body mass indexes (BMIs; calculated as weight in kilograms divided by height in meters squared) of 35 to 50 were studied.INTERVENTIONS: Laparoscopic SG or RYGB.MAIN OUTCOMES AND MEASURES: Perioperative complications were analyzed as all adverse events and serious adverse events (Clavien-Dindo grade >IIIb). Ninety-day mortality was also assessed.RESULTS: A total of 1735 of 14 182 eligible patients (12%; 1282 [73.9%] female; mean (SD) age, 42.9 [11.1] years; mean [SD] BMI, 40.8 [3.7]) were included in the study. Patients were randomized and underwent SG (n = 878) or RYGB (n = 857). The mean (SD) operating time was shorter in those undergoing SG vs RYGB (47 [18] vs 68 [25] minutes; P < .001). The median (IQR) postoperative hospital stay was 1 (1-1) day in both groups. The 30-day readmission rate was 3.1% after SG and 4.0% after RYGB (P = .33). There was no 90-day mortality. The 30-day incidence of any adverse event was 40 (4.6%) and 54 (6.3%) in the SG and RYGB groups, respectively (odds ratio, 0.71; 95% CI, 0.47-1.08; P = .11). Corresponding figures for serious adverse events were 15 (1.7%) for the SG group and 23 (2.7%) for the RYGB group (odds ratio, 0.63; 95% CI, 0.33-1.22; P = .19).CONCLUSIONS AND RELEVANCE: This randomized clinical trial of 1735 patients undergoing primary bariatric surgery found that both SG and RYGB were performed with a low perioperative risk without clinically significant differences between groups.TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT02767505.
4.	Jans, Anders, et al. (författare) Duration of type 2 diabetes and remission rates after bariatric surgery in Sweden 2007-2015 : A registry-based cohort study 2019 Ingår i: PLoS Medicine. - : Public Library of Science. - 1549-1277 .- 1549-1676. ; 16:11 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Although bariatric surgery is an effective treatment for type 2 diabetes (T2D) in patients with morbid obesity, further studies are needed to evaluate factors influencing the chance of achieving diabetes remission. The objective of the present study was to investigate the association between T2D duration and the chance of achieving remission of T2D after bariatric surgery.METHODS AND FINDINGS: We conducted a nationwide register-based cohort study including all adult patients with T2D and BMI ≥ 35 kg/m2 who received primary bariatric surgery in Sweden between 2007 and 2015 identified through the Scandinavian Obesity Surgery Registry. The main outcome was remission of T2D, defined as being free from diabetes medication or as complete remission (HbA1c < 42 mmol/mol without medication). In all, 8,546 patients with T2D were included. Mean age was 47.8 ± 10.1 years, mean BMI was 42.2 ± 5.8 kg/m2, 5,277 (61.7%) were women, and mean HbA1c was 58.9 ± 17.4 mmol/mol. The proportion of patients free from diabetes medication 2 years after surgery was 76.6% (n = 6,499), and 69.9% at 5 years (n = 3,765). The chance of being free from T2D medication was less in patients with longer preoperative duration of diabetes both at 2 years (odds ratio [OR] 0.80/year, 95% CI 0.79-0.81, p < 0.001) and 5 years after surgery (OR 0.76/year, 95% CI 0.75-0.78, p < 0.001). Complete remission of T2D was achieved in 58.2% (n = 2,090) at 2 years, and 46.6% at 5 years (n = 681). The chance of achieving complete remission correlated negatively with the duration of diabetes (adjusted OR 0.87/year, 95% CI 0.85-0.89, p < 0.001), insulin treatment (adjusted OR 0.25, 95% CI 0.20-0.31, p < 0.001), age (adjusted OR 0.94/year, 95% CI 0.93-0.95, p < 0.001), and HbA1c at baseline (adjusted OR 0.98/mmol/mol, 95% CI 0.97-0.98, p < 0.001), but was greater among males (adjusted OR 1.57, 95% CI 1.29-1.90, p < 0.001) and patients with higher BMI at baseline (adjusted OR 1.07/kg/m2, 95% CI 1.05-1.09, p < 0.001). The main limitations of the study lie in its retrospective nature and the low availability of HbA1c values at long-term follow-up.CONCLUSIONS: In this study, we found that remission of T2D after bariatric surgery was inversely associated with duration of diabetes and was highest among patients with recent onset and those without insulin treatment.
5.	Jans, Anders, 1981-, et al. (författare) Factors affecting relapse of type 2 diabetes after bariatric surgery in Sweden 2007-2015 : a registry-based cohort study 2022 Ingår i: Surgery for Obesity and Related Diseases. - : Elsevier. - 1550-7289 .- 1878-7533. ; 18:3, s. 305-312 Forskningsöversikt (refereegranskat)abstract BACKGROUND: Although a large proportion of patients with type 2 diabetes (T2DM) who have undergone metabolic surgery experience initial remission some patients later suffer from relapse. While several factors associated with T2D remission are known, less is known about factors that may influence relapse.OBJECTIVES: To identify possible risk factors for T2D relapse in patients who initially experienced remission.SETTING: Nationwide, registry-based study.METHODS: We conducted a nationwide registry-based retrospective cohort study including all adult patients with T2D and body mass index ≥35 kg/m2 who received primary metabolic surgery with Roux-en-Y gastric bypass (RYGB) or sleeve gastrectomy (SG) in Sweden between 2007 and 2015. Patients who achieved complete diabetes remission 2 years after surgery was identified and analyzed. Main outcome measure was postoperative relapse of T2D, defined as reintroduction of diabetes medication.RESULTS: In total, 2090 patients in complete remission at 2 years after surgery were followed for a median of 5.9 years (interquartile range [IQR] 4.3-7.2 years) after surgery. The cumulative T2D relapse rate was 20.1%. Duration of diabetes (hazard ratio [HR], 1.09; 95% confidence interval [CI], 1.05-1.14; P < .001), preoperative glycosylated hemoglobin A1C (HbA1C) level (HR, 1.01; 95% CI, 1.00-1.02; P = .013), and preoperative insulin treatment (HR, 2.67; 95% CI, 1.84-3.90; P < .001) were associated with higher rates for relapse, while postoperative weight loss (HR, .93; 95% CI, .91-.96; P < .001), and male sex (HR, .65; 95% CI, .46-.91; P = .012) were associated with lower rates.CONCLUSION: Longer duration of T2D, higher preoperative HbA1C level, less postoperative weight loss, female sex, and insulin treatment prior to surgery are risk factors for T2D relapse after initial remission.
6.	Josefsson, Emma, et al. (författare) The effect of routine division of the greater omentum on small bowel obstruction after Roux-en-Y gastric bypass 2023 Ingår i: Surgery for Obesity and Related Diseases. - : Elsevier. - 1550-7289 .- 1878-7533. ; 19:3, s. 178-183 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: It remains unknown whether routine division of the greater omentum during laparoscopic Roux-en-Y gastric bypass (LRYGB) influences the risk for small bowel obstruction (SBO) after RYGB.OBJECTIVE: To evaluate the effect of omental division on SBO after LRYGB stratified by handling of the mesenteric defects.SETTING: Nationwide, registry-based.METHODS: In this registry-based cohort study, 40,517 patients who underwent LRYGB in Sweden within the period from January 1, 2007, to December 31, 2019, with data from the Scandinavian Obesity Surgery Registry (SOReg) were included. The study was based on combined data from the SOReg, the National Patient Register, the Swedish Prescribed Drugs Register, and the Total Population Registry. The main outcome was reoperation for SBO.RESULTS: During a follow-up period of 5.9 ± 2.6 years, the cumulative incidence of SBO was 11.2% in the nondivision group compared with 9.7% among patients with divided omentum (hazard ratio [HR] = .83, 95% confidence interval [CI]: .77-.89, P < .001). The association was seen in patients without mesenteric defects closure (HR = .69, 95% CI: .61-.78, P < .001) as well as patients with closed mesenteric defects (HR = .80, 95% CI: .74-.87, P < .001).CONCLUSION: Division of the greater omentum is associated with reduced risk for SBO after antecolic, antegastric LRYGB and should be considered as a complement to mesenteric defects closure to further reduce the risk for SBO after LRYGB.
7.	le Roux, Carel W., et al. (författare) Bariatric Surgery : There Is a Room for Improvement to Reduce Mortality in Patients with Type 2 Diabetes 2021 Ingår i: Obesity Surgery. - : Springer. - 0960-8923 .- 1708-0428. Tidskriftsartikel (refereegranskat)abstract The new Scandinavian Obesity Surgery Registry (SOReg) report may influence current guidelines. Patients without type 2 diabetes (T2DM) prior to bariatric surgery had lower mortality over 6.3 years compared to those with T2DM. Moreover, patients with T2DM who achieved remission within 1 year after surgery had lower mortality than those who did not remit. Finally, there was no threshold at 10 years, but rather a linear relationship between duration of T2DM and glycemic remission. The SOReg report challenges existing recommendations and clinical practice. A case may also be made for patients with T2DM who did not achieve glycemic remission after 1 year to have a combination approach of surgery with medicines rather than surgery alone. Ultimately, the impact of T2DM duration on glycemic remission again suggest that patients with T2DM should have bariatric surgery earlier.
8.	Stenberg, Erik, 1979-, et al. (författare) Early complications after laparoscopic gastric bypass surgery : results from the Scandinavian Obesity Surgery Registry 2014 Ingår i: Annals of Surgery. - : Lippincott Williams & Wilkins. - 0003-4932 .- 1528-1140. ; 260:6, s. 1040-1047 Tidskriftsartikel (refereegranskat)abstract OBJECTIVE: To identify risk factors for serious and specific early complications of laparoscopic gastric bypass surgery using a large national cohort of patients.BACKGROUND: Bariatric procedures are among the most common surgical procedures today. There is, however, still a need to identify preoperative and intraoperative risk factors for serious complications.METHODS: From the Scandinavian Obesity Surgery Registry database, we identified 26,173 patients undergoing primary laparoscopic gastric bypass operation for morbid obesity between May 1, 2007, and September 30, 2012. Follow-up on day 30 was 95.7%. Preoperative data and data from the operation were analyzed against serious postoperative complications and specific complications.RESULTS: The overall risk of serious postoperative complications was 3.4%. Age (adjusted P = 0.028), other additional operation [odds ratio (OR) = 1.50; confidence interval (CI): 1.04-2.18], intraoperative adverse event (OR = 2.63; 1.89-3.66), and conversion to open surgery (OR = 4.12; CI: 2.47-6.89) were all risk factors for serious postoperative complications. Annual hospital volume affected the rate of serious postoperative complications. If the hospital was in a learning curve at the time of the operation, the risk for serious postoperative complications was higher (OR = 1.45; CI: 1.22-1.71). The 90-day mortality rate was 0.04%.CONCLUSIONS: Intraoperative adverse events and conversion to open surgery are the strongest risk factors for serious complications after laparoscopic gastric bypass surgery. Annual operative volume and total institutional experience are important for the outcome. Patient related factors, in particular age, also increased the risk but to a lesser extent.
9.	Stenberg, Erik, 1979-, et al. (författare) Long-term Safety and Efficacy of Closure of Mesenteric Defects in Laparoscopic Gastric Bypass Surgery : A Randomized Clinical Trial 2023 Ingår i: JAMA Surgery. - : American Medical Association (AMA). - 2168-6254 .- 2168-6262. ; 158:7, s. 709-717 Tidskriftsartikel (refereegranskat)abstract 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.
10.	Stenberg, Erik, 1979-, et al. (författare) Remission, relapse, and risk of major cardiovascular events after metabolic surgery in persons with hypertension : A Swedish nationwide registry-based cohort study 2021 Ingår i: PLoS Medicine. - : Public Library of Science. - 1549-1277 .- 1549-1676. ; 18:11 Tidskriftsartikel (refereegranskat)abstract Background: Several studies have shown that metabolic surgery is associated with remission of diabetes and hypertension. In terms of diabetes, factors such as duration, insulin use, weight loss, and age have been shown to contribute to the likelihood of remission. Such factors have not been determined for hypertension. The aim of this study was to evaluate factors associated with the remission and relapse of hypertension after metabolic surgery, as well as the risk for major adverse cardiovascular event (MACE) and mortality in patients with and without remission.Methods and findings: All adults who underwent metabolic surgery between January 2007 and June 2016 were identified in the nationwide Scandinavian Obesity Surgery Registry (SOReg). Through cross-linkage with the Swedish Prescribed Drug Register, Patient Register, and Statistics Sweden, individual data on prescriptions, inpatient and outpatient diagnoses, and mortality were retrieved. Of the 15,984 patients with pharmacologically treated hypertension, 6,286 (39.3%) were in remission at 2 years. High weight loss and male sex were associated with higher chance of remission, while duration, number of antihypertensive drugs, age, body mass index (BMI), cardiovascular disease, and dyslipidemia were associated with lower chance. After adjustment for age, sex, BMI, comorbidities, and education, the cumulative probabilities of MACEs (2.8% versus 5.7%, adjusted odds ratio (OR) 0.60, 95% confidence interval (CI) 0.47 to 0.77, p < 0.001) and all-cause mortality (4.0% versus 8.0%, adjusted OR 0.71, 95% CI 0.57 to 0.88, p = 0.002) were lower for patients being in remission at 2 years compared with patients not in remission, despite relapse of hypertension in 2,089 patients (cumulative probability 56.3%) during 10-year follow-up. The main limitations of the study were missing information on nonpharmacological treatment for hypertension and the observational study design.Conclusions: In this study, we observed an association between high postoperative weight loss and male sex with better chance of remission, while we observed a lower chance of remission depending on disease severity and presence of other metabolic comorbidities. Patients who achieved remission had a halved risk of MACE and death compared with those who did not. The results suggest that in patients with severe obesity and hypertension, metabolic surgery should not be delayed.Author summary:Why was this study done?Hypertension, particularly in combination with morbid obesity, is a leading cause of mortality and disability worldwide.There is a growing body of evidence supporting the reduction of major adverse cardiovascular events (MACEs) and mortality among patients with metabolic comorbidities after bariatric surgery. Less is known of the factors associated with remission and relapse of disease as well as the impact on MACEs and morality from reaching remission.The main purpose of this study was to assess which factors that contribute to the remission and relapse of hypertension after metabolic surgery, as well as the risk for MACE and mortality in patients who have achieved remission of hypertension.What did the researchers do and find?In this nationwide observational study, 15,984 patients with hypertension undergoing a primary metabolic procedure were included.Almost 40% of patients with hypertension experienced remission of hypertension 2 years after surgery. While 56% relapsed over 10-year follow-up, those who reached remission experienced lower probability for MACEs and all-cause mortality compared with those who did not reach remission.What do these findings mean?The results of this study suggest that metabolic surgery has the highest success rate for patients early in the course of disease and thus suggests that metabolic surgery should not be delayed for patients with severe obesity and hypertension.
11.	Stenberg, Erik, 1979-, et al. (författare) Risk Prediction Model for Severe Postoperative Complication in Bariatric Surgery 2018 Ingår i: Obesity Surgery. - : Springer. - 0960-8923 .- 1708-0428. ; 28:7, s. 1869-1875 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Factors associated with risk for adverse outcome are important considerations in the preoperative assessment of patients for bariatric surgery. As yet, prediction models based on preoperative risk factors have not been able to predict adverse outcome sufficiently.OBJECTIVE: This study aimed to identify preoperative risk factors and to construct a risk prediction model based on these.METHODS: Patients who underwent a bariatric surgical procedure in Sweden between 2010 and 2014 were identified from the Scandinavian Obesity Surgery Registry (SOReg). Associations between preoperative potential risk factors and severe postoperative complications were analysed using a logistic regression model. A multivariate model for risk prediction was created and validated in the SOReg for patients who underwent bariatric surgery in Sweden, 2015.RESULTS: Revision surgery (standardized OR 1.19, 95% confidence interval (CI) 1.14-0.24, p < 0.001), age (standardized OR 1.10, 95%CI 1.03-1.17, p = 0.007), low body mass index (standardized OR 0.89, 95%CI 0.82-0.98, p = 0.012), operation year (standardized OR 0.91, 95%CI 0.85-0.97, p = 0.003), waist circumference (standardized OR 1.09, 95%CI 1.00-1.19, p = 0.059), and dyspepsia/GERD (standardized OR 1.08, 95%CI 1.02-1.15, p = 0.007) were all associated with risk for severe postoperative complication and were included in the risk prediction model. Despite high specificity, the sensitivity of the model was low.CONCLUSION: Revision surgery, high age, low BMI, large waist circumference, and dyspepsia/GERD were associated with an increased risk for severe postoperative complication. The prediction model based on these factors, however, had a sensitivity that was too low to predict risk in the individual patient case.
12.	Stenberg, Erik, 1979-, et al. (författare) The association between socioeconomic factors and weight loss 5 years after gastric bypass surgery 2020 Ingår i: International Journal of Obesity. - : Nature Publishing Group. - 0307-0565 .- 1476-5497. ; 44:11, s. 2279-2290 Tidskriftsartikel (refereegranskat)abstract Introduction: Patients with low socioeconomic status have been reported to have poorer outcome than those with a high socioeconomic status after several types of surgery. The influence of socioeconomic factors on weight loss after bariatric surgery remains unclear. The aim of the present study was to evaluate the association between socioeconomic factors and postoperative weight loss.Materials and methods: This was a retrospective, nationwide cohort study with 5-year follow-up data for 13,275 patients operated with primary gastric bypass in Sweden between January 2007 and December 2012 (n = 13,275), linking data from the Scandinavian Obesity Surgery Registry, Statistics Sweden, the Swedish National Patient Register, and the Swedish Prescribed Drugs Register. The assessed socioeconomic variables were education, profession, disposable income, place of residence, marital status, financial aid and heritage. The main outcome was weight loss 5 years after surgery, measured as total weight loss (TWL). Linear regression models, adjusted for age, preoperative body mass index (BMI), sex and comorbid diseases were constructed.Results: The mean TWL 5 years after surgery was 28.3 +/- 9.86%. In the adjusted model, first-generation immigrants (%TWL, B -2.4 [95% CI -2.9 to -1.9],p < 0.0001) lost significantly less weight than the mean, while residents in medium-sized (B 0.8 [95% CI 0.4-1.2],p = 0.0001) or small towns (B 0.8 [95% CI 0.4-1.2],p < 0.0001) lost significantly more weight.Conclusions: All socioeconomic groups experienced improvements in weight after bariatric surgery. However, as first-generation immigrants and patients residing in larger towns (>200,000 inhabitants) tend to have inferior weight loss compared to other groups, increased support in the pre- and postoperative setting for these two groups could be of value. The remaining socioeconomic factors appear to have a weaker association with postoperative weight loss.
13.	Stenberg, Erik, 1979-, et al. (författare) The impact of socioeconomic factors on the early postoperative complication rate after laparoscopic gastric bypass surgery : A register-based cohort study 2019 Ingår i: Surgery for Obesity and Related Diseases. - : Elsevier. - 1550-7289 .- 1878-7533. ; 15:4, s. 575-581 Tidskriftsartikel (refereegranskat)abstract Background: Socioeconomic factors may influence the outcome of certain surgical procedures, but it is not known whether such factors influence the risk for postoperative complication after bariatric surgery.Objectives: Determining whether different socioeconomic factors influence the risk for postoperative complication after laparoscopic gastric bypass surgery.Setting: Nationwide in Sweden.Methods: Retrospective register-based cohort study that includes all primary laparoscopic gastric bypass procedures in Sweden between 2010 and 2016, using data from the Scandinavian Obesity Surgery Registry, Statistics Sweden, and the Swedish Population Register. Main outcome measures were occurrence and severity of early postoperative complications.Results: Included in this study were 41,537 patients with 30-day follow-up percentage of 96.7%. Study groups with increased risk for postoperative complication (age, sex, body mass index, and co-morbidity adjusted odds ratio with 95% confidence intervals) were as follows: being divorced, a widow, or a widower (1.14 [1.03-1.23]); receiving disability pension (1.37 [1.23-1.53]) or social assistance (1.22 [1.07-1.401); and being first- (1.22 [1.04-1.44]) or second-generation (1.20 [1.09-1.32]) immigrant. In contrast, being single (.90 [.83.991), having higher disposable income (50th-80th percentile:.84 [.76.93]; >80th percentile:.84 [72.98]), and living in a medium (.90 [.83.98]) or small (.84 [.76.92]) town were associated with lower risk. Increased risk for severe postoperative complication was seen for divorced, widowm, or widower (1.30 [1.12-1.521) and those receiving disability pension (1.37 [1.16-1.611) or social assistance (1.32 [1.08-1.62]), while higher disposable income (50th-80th percentile:.79 [.68.92]; >80th percentile .57 [.46.72]) was associated with lower risk.Conclusion: Socioeconomic factors influence the risk for early postoperative complication after laparoscopic gastric bypass surgery. The impact is not enough to exclude patients from surgery, but they must be taken into account in preoperative risk assessment.
14.	Sundbom, Magnus, et al. (författare) Results from the Scandinavian Obesity Surgery Registry : A narrative review 2024 Ingår i: Obesity Reviews. - : Wiley-Blackwell Publishing Inc.. - 1467-7881 .- 1467-789X. ; 25:2 Forskningsöversikt (refereegranskat)abstract In 2007, the Scandinavian Obesity Surgery Registry (SOReg) was started by the profession to monitor the results of bariatric surgery and to provide a high-quality database for research. In the end of August 2023, SOReg contains 88,379 patients (body mass index [BMI] 41.7 kg/m2 , 41.2 years, 77.1% females, gastric bypass 76.8%). In this narrative review, we demonstrate that preoperative weight loss is of value and that the laparoscopic double omega-loop technique is highly suitable for gastric bypass. Closing the mesenteric openings is, however, important. Swedish bariatric surgery has low mortality, and our results are comparative to those of other countries. Significant long-term improvements are found in common obesity-related diseases such as diabetes, hypertension, and sleep apnea. Furthermore, the risk for cardiac failure and major adverse cardiovascular events is significantly reduced. Pregnancy-related outcomes are also improved. Gastric bypass results in significant improvements in quality of life and seems to be cost saving. We have revealed that low socioeconomic status is associated with reduced chance of undergoing bariatric surgery and inferior outcomes. Of note, we have performed several randomized clinical trials within the registry database. In conclusion, high-quality national registry databases, such as SOReg, are important for maintaining high-quality care and present a platform for extensive research.
15.	Wallén, Stefan, 1978-, et al. (författare) Impact of socioeconomic status on new chronic opioid use after gastric bypass surgery 2023 Ingår i: Surgery for Obesity and Related Diseases. - : Elsevier. - 1550-7289 .- 1878-7533. ; 19:12, s. 1375-1381 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Socioeconomic status may influence weight loss, postoperative complications, and health-related quality of life after bariatric surgery. Chronic use of opioid analgesics is a known risk after bariatric surgery, but whether socioeconomic factors are associated with new chronic use of opioid analgesics has not been investigated in depth.OBJECTIVES: The aim of this study was to identify socioeconomic factors associated with the development of new chronic use of opioid analgesics after gastric bypass surgery.SETTING: All hospitals performing bariatric surgery in Sweden.METHODS: This was a retrospective cohort study with prospectively collected data including all primary gastric bypass procedures in Sweden between 2007 and 2015. Data were collected from the Scandinavian Obesity Surgery Registry, the Swedish Prescribed Drug Register, and Statistics Sweden. The primary outcome was new chronic opioid use.RESULTS: Of the 44,671 participants, 1438 patients became new chronic opioid users. Longer education (secondary education; odds ratio [OR] = .71; 95% CI, .62-.81) or higher education (OR = .45; 95% CI, .38-.53), higher disposable income (20th-50th percentile: OR = .75; 95% CI, .66-.85; 50th-80th percentile: OR = .50; 95% CI, .43-.58; and the highest 80th percentile: OR = .40; 95% CI, .32-.51) were significantly associated with lower risk for new chronic opioid use. Being a second-generation immigrant (OR = 1.54; 95% CI, 1.24-1.90), being on a disability pension or early retirement (OR = 3.04; 95% CI, 2.67-3.45), receiving social benefits (OR = 1.88; 95% CI, 1.59-2.22), being unemployed for <100 days (OR = 1.25; 95% CI, 1.08-1.45), being unemployed for >100 days (OR = 1.41; 95% CI, 1.16-1.71), and being divorced or a widow or widower (OR = 1.35; 95% CI, 1.17-1.55) were significantly associated with a higher risk for chronic opioid use.CONCLUSION: Given that long-term opioid use has detrimental effects after bariatric surgery, it is important that information and follow-up are optimized for patients with shorter education, lower income, and disability pension or early retirement because they are at an increased risk of new chronic opioid analgesics use.
16.	Anna Karin, Hedström, et al. (författare) The impact of bariatric surgery on disease activity and progression of multiple sclerosis : A nationwide matched cohort study 2022 Ingår i: Multiple Sclerosis Journal. - : Sage Publications. - 1352-4585 .- 1477-0970. ; 28:13, s. 2099-2105 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Surgical outcomes in patients with multiple sclerosis (MS) following metabolic surgery appear to be similar compared to those of the general bariatric population.OBJECTIVE: To study the impact of metabolic surgery on the clinical course of MS.METHODS: Using data from the Scandinavian Obesity Surgery Registry and the Swedish Multiple Sclerosis register, we compared disease outcomes in 122 cases of MS who had undergone metabolic surgery with those of 122 cases of MS without surgery, matched by a two-staged Propensity score match, including age at disease onset, sex, MS phenotype, body mass index, and preoperative severity of MS as measured by the Expanded Disability Status Scale.RESULTS: The time to 6-month confirmed disability progression during the first five years postbaseline was shorter among the surgical patients (hazard ratio (HR) = 2.31, 95% confidence interval (CI) = 1.09-4.90; p = 0.03). No differences were observed regarding postoperative annual relapse rate (p = 0.24) or time to first postoperative relapse (p = 0.52).CONCLUSION: Although metabolic surgery appears to be a safe and efficient treatment of obesity in patients with MS, the clinical course of the disease might be negatively affected. Long-term nutritional follow-up after surgery and supplementation maintenance are crucial, particularly among those with preoperative deficits.
17.	Backman, Olof, et al. (författare) Gastric Bypass Surgery Reduces De Novo Cases of Type 2 Diabetes to Population Levels : A Nationwide Cohort Study From Sweden 2019 Ingår i: Annals of Surgery. - : Lippincott Williams & Wilkins. - 0003-4932 .- 1528-1140. ; 269:5, s. 895-902 Tidskriftsartikel (refereegranskat)abstract OBJECTIVE: The aim of this study was to determine long-term changes in pharmacological treatment of type 2 diabetes after primary Roux-en-Y gastric bypass (RYGB) surgery, in patients with and without pharmacological treatment of diabetes preoperatively.SUMMARY OF BACKGROUND DATA: Several studies have shown that gastric bypass has good effect on diabetes, at least in the short-term. This study is a nationwide cohort study using Swedish registers, with basically no patients lost to follow-up during up to 7 years after surgery.METHODS: The effect of RYGB on type 2 diabetes drug treatment was evaluated in this nationwide matched cohort study. Participants were 22,047 adults with BMI ≥30 identified in the nationwide Scandinavian Surgical Obesity Registry, who underwent primary RYGB between 2007 and 2012. For each individual, up to 10 general population comparators were matched on birth year, sex, and place of residence. Prescription data were retrieved from the nationwide Swedish Prescribed Drug Register through September 2015. Incident use of pharmacological treatment was analyzed using Cox regression.RESULTS: Sixty-seven percent of patients with pharmacological treatment of type 2 diabetes before surgery were not using diabetes drugs 2 years after surgery and 61% of patients were not pharmacologically treated up to 7 years after surgery. In patients not using diabetes drugs at baseline, there were 189 new cases of pharmacological treatment of type 2 diabetes in the surgery group and 2319 in the matched general population comparators during a median follow-up of 4.6 years (incidence: 21.4 vs 27.9 per 10,000 person-years; adjusted hazard ratio 0.77, 95% confidence interval 0.67-0.89; P < 0.001).CONCLUSIONS: Gastric bypass surgery not only induces remission of pharmacological treatment of type 2 diabetes but also protects from new onset of pharmacological diabetes treatment. The effect seems to persist in most, but not all, patients over 7 years of follow-up.
18.	Cao, Yang, Associate Professor, 1972-, et al. (författare) A Comparative Study of Machine Learning Algorithms in Predicting Severe Complications after Bariatric Surgery 2019 Ingår i: Journal of Clinical Medicine. - : MDPI. - 2077-0383. ; 8:5 Tidskriftsartikel (refereegranskat)abstract Background: Severe obesity is a global public health threat of growing proportions. Accurate models to predict severe postoperative complications could be of value in the preoperative assessment of potential candidates for bariatric surgery. So far, traditional statistical methods have failed to produce high accuracy. We aimed to find a useful machine learning (ML) algorithm to predict the risk for severe complication after bariatric surgery.Methods: We trained and compared 29 supervised ML algorithms using information from 37,811 patients that operated with a bariatric surgical procedure between 2010 and 2014 in Sweden. The algorithms were then tested on 6250 patients operated in 2015. We performed the synthetic minority oversampling technique tackling the issue that only 3% of patients experienced severe complications.Results: Most of the ML algorithms showed high accuracy (>90%) and specificity (>90%) in both the training and test data. However, none of the algorithms achieved an acceptable sensitivity in the test data. We also tried to tune the hyperparameters of the algorithms to maximize sensitivity, but did not yet identify one with a high enough sensitivity that can be used in clinical praxis in bariatric surgery. However, a minor, but perceptible, improvement in deep neural network (NN) ML was found.Conclusion: In predicting the severe postoperative complication among the bariatric surgery patients, ensemble algorithms outperform base algorithms. When compared to other ML algorithms, deep NN has the potential to improve the accuracy and it deserves further investigation. The oversampling technique should be considered in the context of imbalanced data where the number of the interested outcome is relatively small.
19.	Cao, Yang, Associate Professor, 1972-, et al. (författare) Deep Learning Neural Networks to Predict Serious Complications After Bariatric Surgery : Analysis of Scandinavian Obesity Surgery Registry Data 2020 Ingår i: JMIR Medical Informatics. - : JMIR Publications. - 2291-9694. ; 8:5 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Obesity is one of today's most visible public health problems worldwide. Although modern bariatric surgery is ostensibly considered safe, serious complications and mortality still occur in some patients.OBJECTIVE: This study aimed to explore whether serious postoperative complications of bariatric surgery recorded in a national quality registry can be predicted preoperatively using deep learning methods.METHODS: Patients who were registered in the Scandinavian Obesity Surgery Registry (SOReg) between 2010 and 2015 were included in this study. The patients who underwent a bariatric procedure between 2010 and 2014 were used as training data, and those who underwent a bariatric procedure in 2015 were used as test data. Postoperative complications were graded according to the Clavien-Dindo classification, and complications requiring intervention under general anesthesia or resulting in organ failure or death were considered serious. Three supervised deep learning neural networks were applied and compared in our study: multilayer perceptron (MLP), convolutional neural network (CNN), and recurrent neural network (RNN). The synthetic minority oversampling technique (SMOTE) was used to artificially augment the patients with serious complications. The performances of the neural networks were evaluated using accuracy, sensitivity, specificity, Matthews correlation coefficient, and area under the receiver operating characteristic curve.RESULTS: In total, 37,811 and 6250 patients were used as the training data and test data, with incidence rates of serious complication of 3.2% (1220/37,811) and 3.0% (188/6250), respectively. When trained using the SMOTE data, the MLP appeared to have a desirable performance, with an area under curve (AUC) of 0.84 (95% CI 0.83-0.85). However, its performance was low for the test data, with an AUC of 0.54 (95% CI 0.53-0.55). The performance of CNN was similar to that of MLP. It generated AUCs of 0.79 (95% CI 0.78-0.80) and 0.57 (95% CI 0.59-0.61) for the SMOTE data and test data, respectively. Compared with the MLP and CNN, the RNN showed worse performance, with AUCs of 0.65 (95% CI 0.64-0.66) and 0.55 (95% CI 0.53-0.57) for the SMOTE data and test data, respectively.CONCLUSIONS: MLP and CNN showed improved, but limited, ability for predicting the postoperative serious complications after bariatric surgery in the Scandinavian Obesity Surgery Registry data. However, the overfitting issue is still apparent and needs to be overcome by incorporating intra- and perioperative information.
20.	Dahlberg, Karuna, 1979-, et al. (författare) Incident self-harm after bariatric surgery : A nationwide registry-based matched cohort study 2023 Ingår i: Clinical Obesity. - : John Wiley & Sons. - 1758-8103 .- 1758-8111. ; 13:3 Tidskriftsartikel (refereegranskat)abstract The aims of this study were to evaluate the longitudinal risk of self-harm and the risk factors for self-harm after bariatric surgery in patients and control subjects without prior self-harm. This observational cohort study was based on prospectively registered data. Patients 18–70 years at time of surgery, body mass index (BMI) > 30 kg/m2, who underwent a primary Roux-en-Y gastric bypass (RYGB) procedure or a primary sleeve gastrectomy between 2007 and 2019 were considered for inclusion. All patients who met the inclusion criteria were matched 1:10 to the general population in Sweden (69 492 patients vs. 694 920 controls). After excluding patients and controls with previous self-harm, a self-harm event occurred in 1408 patients in the surgical group (incidence rate (IR) 3.54/1000 person-years, 95% confidence interval (CI) 3.36–3.73) versus in 3162 patients in the control group (IR 0.81/1000 person-years, 95% CI 0.78–0.84), with a hazard ratio (HR) of 4.38 (95% CI 4.11–4.66, p < .001). Median follow-up time was 6.1 years. Risk factors were younger age, lower BMI, cardiovascular, and chronic obstructive pulmonary disease, all aspects of psychiatric comorbidities (except neuropsychiatric disorder), lower socioeconomic status, RYGB, lower health-related quality of life, lower postoperative weight loss, and not attending postoperative follow-up visits. Self-harm is clearly higher after bariatric surgery than in the general population. A qualitative follow-up may be particularly important for patients at increased risk.
21.	Näslund, Erik, et al. (författare) Association of Metabolic Surgery With Major Adverse Cardiovascular Outcomes in Patients With Previous Myocardial Infarction and Severe Obesity A Nationwide Cohort Study 2021 Ingår i: Circulation. - : Lippincott Williams & Wilkins. - 0009-7322 .- 1524-4539. ; 143:15, s. 1458-1467 Tidskriftsartikel (refereegranskat)abstract Background: The number of patients with myocardial infarction and severe obesity is increasing and there is a lack of evidence how these patients should be treated. The aim of this study was to investigate the association between metabolic surgery (Roux-en-Y gastric bypass and sleeve gastrectomy) and major adverse cardiovascular events in patients with previous myocardial infarction (MI) and severe obesity.Methods: Of 566 patients with previous MI registered in the SWEDEHEART registry (Swedish Web-System for Enhancement and Development of Evidence-Based Care in Heart Disease Evaluated According to Recommended Therapies) undergoing metabolic surgery and registered in the nationwide Scandinavian Obesity Surgery Registry, 509 patients (Roux-en-Y gastric bypass n=465; sleeve gastrectomy n=44) could be matched 1:1 to a control with MI from SWEDEHEART, but no subsequent metabolic surgery regarding sex, age (+/- 3 years), year of MI (+/- 3 years), and body mass index (+/- 3). The 2 groups were well matched, except for a lower proportion of reduced ejection fraction after MI (7% versus 12%), previous heart failure (10% versus 19%), atrial fibrillation (6% versus 10%), and chronic obstructive pulmonary disease (4% versus 7%) in patients undergoing metabolic surgery.Results: The median (interquartile range) follow-up time was 4.6 (2.7-7.1) years. The 8-year cumulative probability of major adverse cardiovascular events was lower in patients undergoing metabolic surgery (18.7% [95% CI, 15.9-21.5%] versus 36.2% [33.2-39.3%], adjusted hazard ratio, 0.44 [95% CI, 0.32-0.61]). Patients undergoing metabolic surgery had also a lower risk of death (adjusted HR, 0.45 [95% CI, 0.29-0.70]; MI, 0.24 [0.14-0.41]) and new onset heart failure, but there were no significant differences regarding stroke (0.91 [0.38-2.20]) and new onset atrial fibrillation (0.56 [0.31-1.01]).Conclusions: In severely obese patients with previous MI, metabolic surgery is associated with a low risk for serious complications, lower risk of major adverse cardiovascular events, death, new MI, and new onset heart failure. These findings need to be confirmed in a randomized, controlled trial.
22.	Näslund, I., et al. (författare) Comment on : Reintervention or mortality within 90 days of bariatric surgery: a population-based cohort study 2020 Ingår i: British Journal of Surgery. - : John Wiley & Sons. - 0007-1323 .- 1365-2168. ; 107:9, s. E349-E349 Tidskriftsartikel (refereegranskat)
23.	Näslund, Joacim, et al. (författare) Considerations needed for analysing data from the Swedish Electrofishing RegiSter (SERS), with special reference to the RivFishTIME database of long-term riverine surveys 2023 Ingår i: Fauna Norvegica. - 1502-4873 .- 1891-5396. ; 42, s. 47-51 Tidskriftsartikel (refereegranskat)abstract The published database RivFishTIME (Comte et al. 2021, Global Ecology and Biogeography, doi: 10.1111/geb.13210) includes a large section of time-series data on fish abundance in Swedish rivers from the Swedish Electrofishing RegiSter, SERS. Knowledge about the limitations of the source data are important when extracting and analyzing data and with this brief note we provide some details that may be helpful for interpreting the Swedish time-series. The note highlights the importance of linking vital metadata to extracted focal data when constructing new databases, especially concerning time series data from monitoring programs conducted in non-randomly selected sites with human environmental impacts. Many of the SERS data come from rivers that have been affected by human impact, e.g. liming to mitigate environmental acidification and hydropower dams, since before monitoring was initiated. Data in SERS are also biased towards shallow salmonid habitats, due to the configuration of Swedish monitoring programs. Hence, data from many rivers are not representative of their fish biodiversity in general. This information is vital for appropriate interpretation of fish biodiversity trends. For RivFishTIME analyses considerations are important since Swedish data constitutes a large proportion of the database. We also provide background information about SERS and references to other Swedish databases containing complementary information. Finally, we provide contact information of the SERS database curators, who can assist prospective analysts with data extraction from SERS.
24.	Raoof, Mustafa, 1966-, et al. (författare) Improvements of health-related quality of life 5 years after gastric bypass. What is important besides weight loss? A study from Scandinavian Obesity Surgery Register 2020 Ingår i: Surgery for Obesity and Related Diseases. - : Elsevier. - 1550-7289 .- 1878-7533. ; 16:9, s. 1249-1257 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Obesity continues to increase in the world. It is strongly associated with morbidity, mortality, and decrease of health-related quality of life (HRQoL). Surgery is the most effective treatment for obesity, resulting in sustained weight loss and improvements of HRQoL. The aim of this study was to examine whether other factors, apart from weight loss, are associated with improvement in HRQoL scores between the preoperative visit and the 5-year follow-up.OBJECTIVES: To examine whether there are factors besides weight loss that affect the improvement of HRQoL from before to 5 years after gastric bypass surgery.SETTING: Large, nationwide, observational study with national quality and research registry.METHODS: Patients operated with a primary gastric bypass in Sweden between January 2008 and December 2012 were identified in the Scandinavian Obesity Surgery Register. Patients with HRQoL data available at both baseline and 5 years after surgery were included. Two HRQoL instruments, the RAND Short form-36 and the obesity-related problems scale, were used in the study.RESULTS: The study sample comprised 6998 patients (21% men). Differences in HRQoL change according to sex were minor. Younger patients showed greater improvements in physical health scales. In general linear regression model analyses, age and weight loss correlated significantly with improvement in HRQoL after 5 years. Patients treated medically for depression preoperatively (13%) experienced less improvement in HRQoL than patients without such treatment. Patients with postoperative complications (26%) had significantly less improvements in all aspects of HRQoL compared with those without any form of postoperative complication.CONCLUSION: The study confirmed the importance of weight loss for improvement in HRQoL after bariatric surgery. Preoperative medication for depression and suffering a complication during the 5-year follow-up period were associated with less improvement in HRQoL.
25.	Raoof, Mustafa, 1966-, et al. (författare) Improvements of health-related quality of life five years after gastric bypass. What is important besides weight loss? A study from Scandinavian Obesity Surgery Register Annan publikation (övrigt vetenskapligt/konstnärligt)
26.	Rydén, Mikael, et al. (författare) Lipolysis defect in people with obesity who undergo metabolic surgery 2022 Ingår i: Journal of Internal Medicine. - : Wiley-Blackwell Publishing Inc.. - 0954-6820 .- 1365-2796. ; 292:4, s. 667-678 Tidskriftsartikel (refereegranskat)abstract OBJECTIVE: Cross-sectional studies demonstrate that catecholamine stimulation of fat cell lipolysis is blunted in obesity. We investigated whether this defect persists after substantial weight loss has been induced by metabolic surgery, and whether it is related to the outcome.DESIGN/METHODS: Patients with obesity not able to successfully reduce body weight by conventional means (n = 126) were investigated before and 5 years after Roux-en-Y gastric bypass surgery (RYGB). They were compared with propensity-score matched subjects selected from a control group (n = 1017), and with the entire group after adjustment for age, sex, body mass index (BMI), fat cell volume and other clinical parameters. Catecholamine-stimulated lipolysis (glycerol release) was investigated in isolated fat cells using noradrenaline (natural hormone) or isoprenaline (synthetic beta-adrenoceptor agonist).RESULTS: Following RYGB, BMI was reduced from 39.9 (37.5-43.5) (median and interquartile range) to 29.5 (26.7-31.9) kg/m2 (p < 0.0001). The post-RYGB patients had about 50% lower lipolysis rates compared with the matched and total series of controls (p < 0.0005). Nordrenaline activation of lipolysis at baseline was associated with the RYGB effect; those with high lipolysis activation (upper tertile) lost 30%-45% more in body weight, BMI or fat mass than those with low (bottom tertile) initial lipolysis activation (p < 0.0007).CONCLUSION: Patients with obesity requiring metabolic surgery have impaired ability of catecholamines to stimulate lipolysis, which remains despite long-term normalization of body weight by RYGB. Furthermore, preoperative variations in the ability of catecholamines to activate lipolysis may predict the long-term reduction in body weight and fat mass.
27.	Stenberg, Erik, 1979-, et al. (författare) Association between attention deficit hyperactivity disorder and outcomes after metabolic and bariatric surgery : a nationwide propensity-matched cohort study 2023 Ingår i: Surgery for Obesity and Related Diseases. - : Elsevier. - 1550-7289 .- 1878-7533. ; 19:2, s. 92-100 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: The risks and benefits of metabolic and bariatric surgery for patients with attention deficit hyperactivity disorder (ADHD) remain to be investigated.OBJECTIVE: The aim of this study was to assess short- and long-term outcomes after metabolic and bariatric surgery in patients with previous ADHD compared with matched control individuals.SETTING: Registry based.METHODS: This 2-staged matched-cohort study included all adults with a body mass index of ≥30 kg/m2 who underwent primary Roux-en-Y gastric bypass or sleeve gastrectomy from 2007 until 2017 registered in the Scandinavian Obesity Surgery Registry. Patients with prescribed medication for ADHD were matched with control individuals without ADHD with a follow-up of up to 11 years after surgery.RESULTS: Among 1431 patients with ADHD and 2862 control individuals (mean body mass index, 42 kg/m2; mean age, 35 years), no difference in weight loss or follow-up attendance over 2 years was seen. ADHD was associated with a higher risk for early postoperative complications (odds ratio [OR] = 1.31; 95% confidence interval [CI], 1.05-1.63), self-harm (hazards ratio [HR] = 1.39; 95% CI, 1.11-1.75), and substance abuse (HR = 1.34; 95% CI, 1.16-1.55), while associations with overall mortality (HR = 1.42; 95% CI, .99-2.03), major adverse cardiovascular and cerebrovascular events (HR = 1.93; 95% CI, .98-3.83), and effects on obesity-related diseases were uncertain. ADHD was associated with a lower health-related quality of life in all aspects before surgery. These differences increased for mental and obesity-related aspects but remained unchanged over time for physical aspects.CONCLUSIONS: Compared with patients without ADHD, patients treated pharmacologically for ADHD experience similar weight loss and remission of obesity-related diseases without an increased risk for serious complications but report a lower health-related quality of life and have an increased risk of substance abuse and self-harm. This further emphasizes the need for close follow-up care for this group of individuals.
28.	Stenberg, Erik, 1979-, et al. (författare) Association between metabolic surgery and cardiovascular outcome in patients with hypertension : A nationwide matched cohort study 2020 Ingår i: PLoS Medicine. - : Public Library of Science (PLoS). - 1549-1277 .- 1549-1676. ; 17:9 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Hypertension, together with obesity, is a leading cause of mortality and disability. Whilst metabolic surgery offers remission of several metabolic comorbidities, the effect for patients with hypertension remains controversial. The objective of the present study was to evaluate the effect of metabolic surgery on cardiovascular events and mortality on patients with morbid obesity (body mass index [BMI] ≥ 35 kg/m2) and hypertension.METHODS AND FINDINGS: We conducted a matched cohort study of 11,863 patients with morbid obesity and pharmacologically treated hypertension operated on with metabolic surgery and a matched non-operated-on control group of 26,199 subjects with hypertension (matched by age, sex, and area of residence) of varied matching ratios from 1:1 to 1:9, using data from the Scandinavian Obesity Surgery Register (SOReg), the Swedish National Patient Registers (NPR) for in-hospital and outpatient care, the Swedish Prescribed Drug Register, and Statistics Sweden. The main outcome was major adverse cardiovascular event (MACE), defined as first occurrence of acute coronary syndrome (ACS) event, cerebrovascular event, fatal cardiovascular event, or unattended sudden cardiac death. The mean age in the study group was 52.1 ± 7.46 years, with 65.8% being women (n = 7,810), and mean BMI was 41.9 ± 5.43 kg/m2. MACEs occurred in 379 operated-on patients (3.2%) and 1,125 subjects in the control group (4.5%). After adjustment for duration of hypertension, comorbidities, and education, a reduction in risk was seen in the metabolic surgery group (adjusted hazard ratio [HR] 0.73, 95% confidence intervals [CIs] 0.64-0.84, P < 0.001). The surgery group had lower risk for ACS events (adjusted HR 0.52, 95% CI 0.41-0.66, P < 0.001) and a tendency towards lower risk for cerebrovascular events (adjusted HR 0.81, 95% CI 0.63-1.01, P = 0.060) compared with controls. The main limitations with the study were the lack of information on BMI and history of smoking in the control group and the nonrandomised study design.CONCLUSION: Metabolic surgery on patients with morbid obesity and pharmacologically treated hypertension was associated with lower risk for MACEs and all-cause mortality compared with age- and sex-matched controls with hypertension from the general population.
29.	Stenberg, Erik, 1979-, et al. (författare) Bariatric and metabolic surgery in patients with morbid obesity and multiple sclerosis : a nationwide, matched cohort study 2021 Ingår i: Surgery for Obesity and Related Diseases. - : Elsevier. - 1550-7289 .- 1878-7533. ; 17:6, s. 1108-1114 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Despite an association between obesity and multiple sclerosis (MS), very little is known regarding the safety and efficacy outcomes for patients with MS and severe obesity undergoing metabolic surgery.OBJECTIVES: The aim of the present study was to evaluate early complications and efficacy outcomes of metabolic surgery in patients with severe obesity and MS.SETTING: Nationwide, Sweden.METHODS: In this, matched cohort study, 196 patients with an MS diagnosis in the Swedish MS register who were undergoing metabolic surgery (gastric bypass or sleeve gastrectomy) with a registration in the Scandinavian Obesity Surgery Registry (SOReg) were matched 1:10 with a control group without MS diagnosis from the SOReg. A 2-stage matching procedure was used (exact match by surgical method, followed by propensity Score matching, including age, sex, preoperative BMI, surgical center, surgical access, year of surgery, hypertension, diabetes, sleep apnea, and dyslipidemia).RESULTS: Weight loss at 2 years after surgery was similar for patients with MS and controls (total weight loss 31.6 ± 9.1 versus 31.8 ± 9.2, P = .735). No significant differences were seen in either the overall postoperative complication rate (7.9% versus 7.2%, P = .778), or serious postoperative complications (3.7% versus 2.8%, P = .430). All aspects of health-related quality of life (HRQoL) improved in both groups but less so for the physical aspects of HRQoL in patients with MS.CONCLUSION: Metabolic surgery is a safe and efficient treatment for severe obesity in patients with MS, and it leads to subsequent improvements in HRQoL. Further studies addressing the effects of metabolic surgery on MS-related symptoms are needed.
30.	Stenberg, Erik, 1979-, et al. (författare) Factors determining chance of type 2 diabetes remission after Roux-en-Y gastric bypass surgery : a nationwide cohort study in 8057 Swedish patients 2021 Ingår i: BMJ Open Diabetes Research & Care. - : BMJ Publishing Group Ltd. - 2052-4897. ; 9:1 Tidskriftsartikel (refereegranskat)abstract INTRODUCTION: Bariatric and metabolic surgery is an effective treatment option for type 2 diabetes (T2D). Increased knowledge regarding factors associated with diabetes remission is essential in individual decision making and could guide postoperative care. Therefore, we aimed to explore factors known to affect the chance of achieving diabetes remission after bariatric and metabolic surgery and to further investigate the impact of socioeconomic factors.RESEARCH DESIGN AND METHODS: In this nationwide study, we assessed all patients with T2D who underwent Roux-en-Y gastric bypass (RYGB) surgery between 2007 and 2015 in the Scandinavian Obesity Surgery Registry. Remission was defined as absence of antidiabetic medication for T2D 2 years after surgery. Multivariable logistic regression was used to evaluate factors associated with diabetes remission, with missing data handled by multiple imputations.RESULTS: , mean hemoglobin A1c 59.0±17.33, and 61.7% (n=4970) were women. Two years after surgery, 6211 (77.1%) patients achieved T2D remission. Preoperative insulin treatment (OR 0.26, 95% CI 0.22 to 0.30), first-generation immigrant (OR 0.66, 95% CI 0.57 to 0.77), duration of T2D (OR 0.89, 95% CI 0.88 to 0.90), dyslipidemia (OR 0.71, 95% CI 0.62 to 0.81), age (OR 0.97, 95% CI 0.96 to 0.97), and high glycosylated hemoglobin A1c (HbA1c) (OR 0.99, 95% CI 0.98 to 0.99) were all associated with lower T2D remission rate. In contrast, residence in a medium-sized (OR 1.39, 95% CI 1.20 to 1.61) or small (OR 1.46, 95% CI 1.25 to 1.71) town and percentage of total weight loss (OR 1.04, 95% CI 1.03 to 1.04) were associated with higher remission rates.CONCLUSION: Among patients with T2D undergoing RYGB surgery, increasing age, HbA1c, and diabetes duration decreased the chance of reaching diabetes remission without cut-offs, while postoperative weight loss demonstrated a positive linear association. In addition, being a first-generation immigrant and living in a large city were socioeconomic factors having a negative association.
31.	Stenberg, Erik, 1979-, et al. (författare) Limited Effect of Beta-blockade on Postoperative Outcome After Laparoscopic Gastric Bypass Surgery 2020 Ingår i: Obesity Surgery. - : Springer Science+Business Media B.V.. - 0960-8923 .- 1708-0428. ; 30:1, s. 139-145 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: The benefit of beta-blockade on postoperative outcome remains controversial, though recent studies have suggested a role during major non-cardiac surgery. The benefit of beta-blockade during minimally invasive gastric bypass surgery remains unclear. The aim of the present study was to evaluate the possible association between preoperative beta-blocker therapy and postoperative outcome after laparoscopic gastric bypass surgery.METHODS: Patients operated with primary laparoscopic gastric bypass surgery in Sweden between 2007 and 2017 were identified through the Scandinavian Obesity Surgery Registry. The dataset was linked to the Swedish National Patient Registry, the Swedish Prescribed Drug Registry, and Statistics Sweden. The main outcome was serious postoperative complication within 30 days of surgery; with postoperative complication, 90-day and 1-year mortality, and weight loss at 2 years after surgery as secondary endpoints. The Poisson regression model was used to evaluate primary and secondary categorical outcomes. A general mixed model was performed to evaluate 2-year weight loss.RESULTS: In all, 50281 patients were included in the study. No difference was seen between patients on beta-blockade and the control group regarding postoperative complications (adjusted incidence rate ratio 1.04 (95%CI 0.93-1.15), p = 0.506), serious postoperative complication (adjusted IRR 1.06 95%CI 0.89-1.27), p = 0.515), 90-day mortality (adjusted IRR 0.71 (95%CI 0.24-2.10), p = 0.537), and 1-year mortality (adjusted IRR 1.26 (95%CI 0.67-2.36), p = 0.467). Weight loss 2 years after surgery was slightly greater in patients on beta-blockade (adjusted coefficient 0.53 (95%CI 0.19-0.87), p = 0.002).CONCLUSIONS: Beta-blockade has limited impact on postoperative outcome after laparoscopic gastric bypass surgery.
32.	Stenberg, Erik, 1979-, et al. (författare) Major adverse cardiovascular events among patients with type-2 diabetes, a nationwide cohort study comparing primary metabolic and bariatric surgery to GLP-1 receptor agonist treatment 2023 Ingår i: International Journal of Obesity. - : Nature Publishing Group. - 0307-0565 .- 1476-5497. ; 47:4, s. 251-256 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Glucagon-like Peptide-1 receptor agonists (GLP-1 RA) and metabolic and bariatric surgery (MBS) both improve cardiovascular outcomes in patients with severe obesity and type-2 diabetes (T2D). The aim of the present study was to assess the impact of MBS on major cardiovascular adverse events (MACE) in patients with severe obesity and T2D compared to patients with T2D treated with GLP-1 RA. SUBJECTS ANDMETHODS: In this propensity score matched cohort study on nationwide data, patients with T2D and severe obesity who underwent MBS in Sweden from 2007 until 2019 were identified from the Scandinavian Obesity Surgery Registry and matched to a non-surgical group with T2D treated with GLP-1 RA (81.7% liraglutide, 9.0% dulaglutide, 6.0% exenatide, 1.6% lixisenatide and 0.8% semaglutide) from the general population using generalized linear model. Major outcome was MACE (hospitalization for acute coronary syndrome or cerebrovascular event or all-cause death), evaluated with multivariable Cox regression.RESULTS: In total 2161 patients (obesity class I (10.2%), class II (40.3%), class III (49.5%)) were matched to 2161 non-surgical patients (mean age 51.1 ± 9.29 vs 51.5 ± 8.92 years, 64.8% vs. 64.4% women, with mean number of diabetes drugs of 2.5 ± 0.89 vs 2.6 ± 0.87, a mean duration of diabetes of 6.0 ± 4.15 vs 6.0 ± 4.51 years with 44.2% vs. 42.8% being treated with insulin at baseline). During the study period, 113 patients (8-year cumulative incidence 9.3%) compared to 130 non-surgical patients (8-year cumulative incidence 11.3%) suffered from MACE or all-cause mortality (HR 0.76, 95%CI 0.59-0.98), and 69 patients (8-year cumulative incidence 5.1%) compared to 92 non-surgical patients (8-year cumulative incidence 7.6%) suffered from a non-fatal MACE (HR 0.68, 95%CI 0.49-0.93).CONCLUSION: In this matched cohort study, MBS was associated with lower risk for MACE compared to treatment with early GLP-1 RA in patients with T2D.
33.	Stenberg, Erik, 1979-, et al. (författare) Major cardiovascular events after metabolic surgery in patients with previous heart disease with or without type 2 diabetes : a nationwide cohort study 2022 Ingår i: Surgery for Obesity and Related Diseases. - : Elsevier. - 1550-7289 .- 1878-7533. ; 18:7, s. 935-942 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: While metabolic surgery is known to improve type 2 diabetes (T2D) as well as established heart disease separately, it is not known whether the outcome is influenced by T2D status in patients with established heart disease.OBJECTIVES: To evaluate the risks for major cardiovascular events (MACE) or mortality in patients with established heart disease with or without T2D.SETTING: Nationwide and registry-based (Sweden).METHODS: Patients with established heart disease operated with sleeve gastrectomy or Roux-en-Y gastric bypass in Sweden from 2007-2019 were matched 1:1 to normal population controls using 2-staged matching (exact matching on T2D, followed by optimal matching on propensity score for age, sex, dyslipidemia, chronic obstructive pulmonary disease, type of heart disease, T2D duration, county of residence, and level of education). The risk for MACE was evaluated separately depending on T2D status.RESULTS: In total, 1513 patients who underwent surgery and 1513 matched controls were included. Reduced risk for MACE and mortality were seen after metabolic surgery for patients with heart disease and T2D compared with controls (adjusted hazard ratio [HR] = .59, 95% confidence interval [CI]: .48-.72, P < .001, and adjusted HR = .52, 95% CI: .40-.67, P < .001, respectively), and for patients with heart disease alone compared with controls (adjusted HR = .73, 95% CI: .57-.94, P = .016, and adjusted HR = .63, 95% CI: .45-.89, P = .008, respectively).CONCLUSION: Metabolic surgery was associated with a reduced risk for MACE and mortality in patients with preexisting heart disease and T2D as well as in patients with heart disease without T2D. Patients with heart disease and T2D seem to experience the highest risk reduction.
34.	Stenberg, Erik, 1979-, et al. (författare) Metabolic and Bariatric Surgery for People Living With HIV-A Propensity-Matched Cohort Study 2023 Ingår i: Journal of Acquired Immune Deficiency Syndromes. - : Lippincott Williams & Wilkins. - 1525-4135 .- 1944-7884. ; 94:3, s. e5-e8 Tidskriftsartikel (refereegranskat)
35.	Stenberg, Erik, 1979-, et al. (författare) Remission of Obesity-Related Sleep Apnea and Its Effect on Mortality and Cardiovascular Events After Metabolic and Bariatric Surgery : A Propensity Matched Cohort Study 2024 Ingår i: Journal of the American College of Surgeons. - : Elsevier. - 1072-7515 .- 1879-1190. Tidskriftsartikel (refereegranskat)abstract BACKGROUND: While obstructive sleep apnea (OSA) is common among patients with obesity and linked to cardiovascular disease, there is a lack of studies evaluating the effects of reaching remission from OSA after metabolic and bariatric surgery (MBS).STUDY DESIGN: A registry-based nationwide study including patients operated with sleeve gastrectomy or Roux-en-Y gastric bypass from 2007 until 2019 in Sweden. Patients who reached remission of OSA were compared to those who did not reach remission, and a propensity score matched control group of patients without OSA at the time of operation. Main outcome was overall mortality, secondary outcome was major cardiovascular events (MACE).RESULTS: In total, 5892 patients with OSA and 11,552 matched patients without OSA completed a 1-year follow-up and were followed for a median of 6.8 years. Remission of OSA was seen for 4334 patients (74%). Patients in remission had a lower risk for overall mortality (cumulative incidence 6.0% v. 9.1%;p<0.001) and MACE (cumulative incidence 3.4% vs 5.8%;p<0.001) at 10-years after operation compared to those who did not reach remission. The risk was similar to that of the control group without OSA at baseline (cumulative incidence for mortality 6.0%, p=0.493, for MACE 3.7%, p=0.251).CONCLUSION: The remission rate of OSA was high after MBS. This was in turn associated with reduced risk for death and MACE compared to patients who did not achieve remission reaching a similar risk seen among patients without OSA at baseline. A diligent follow-up of patients who do not reach remission remains important.
36.	Stenberg, Erik, 1979-, et al. (författare) Safety of bariatric surgery in patients with previous acute coronary events or heart failure : nationwide cohort study 2022 Ingår i: BJS Open. - : Oxford University Press. - 2474-9842. ; 6:3 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: Metabolic (bariatric) surgery for patients with severe obesity and pre-existing heart disease has been reported to reduce the risk for cardiovascular events and mortality; however, concerns of short- and mid-term complications may limit the utility of metabolic surgery for these patients.METHOD: This was an observational, nationwide, matched study, including all adult patients operated with a primary gastric bypass or sleeve gastrectomy procedure in Sweden from January 2011 until October 2020. Patients with or without previous acute coronary syndrome or heart failure were matched 1:5 using propensity scores. The primary outcome was serious postoperative complications, and secondary outcomes were the occurrence of any short-term complications, mid-term complications, weight loss, and health-related quality of life estimates after surgery.RESULTS: Of patients who underwent metabolic surgery, 1165 patients with previous acute coronary syndrome or heart failure and 5825 without diagnosed heart disease were included in matched analyses. No difference was seen between the groups at risk for serious postoperative complications within 30 days of surgery (OR 1.33, 95 per cent c.i. 0.95 to 1.86, P = 0.094), whereas heart disease was associated with an increased risk for cardiovascular complications (incidence 1.1 per cent versus 0.2 per cent, P < 0.001). No differences in overall mid-term complications, weight loss, or improvement of health-related quality of life were seen. Pre-existing heart disease was associated with an increased risk for bowel obstruction and strictures (OR 1.89, 95 per cent c.i. 1.20 to 2.99, P = 0.006).CONCLUSION: Patients with severe obesity and heart disease undergoing metabolic surgery have an increased risk of postoperative cardiovascular complications compared with patients with severe obesity without heart disease. A careful preoperative cardiovascular work-up is needed but patients with severe obesity and heart disease should not be excluded from undergoing metabolic surgery.
37.	Studer, Erik, et al. (författare) Serotonin Depletion-Induced Maladaptive Aggression Requires the Presence of Androgens 2015 Ingår i: Plos One. - : Public Library of Science (PLoS). - 1932-6203. ; 10:5 Tidskriftsartikel (refereegranskat)abstract The sex hormone testosterone and the neurotransmitter serotonin exert opposite effects on several aspects of behavior including territorial aggression. It is however not settled if testosterone exerts its pro-aggressive effects by reducing serotonin transmission and/or if the anti-aggressive effect of serotonin requires the presence of the androgen. Using the resident intruder test, we now show that administration of the serotonin synthesis inhibitor parachlorophenylalanine (300 mg/kg x 3 days) increases the total time of attack as well as the percentage amount of social behavior spent on attack but not that spent on threat - i.e. that it induces a pattern of unrestricted, maladaptive aggression - in gonadectomized C57Bl/6 male mice receiving testosterone replacement; in contrast, it failed to reinstate aggression in those not given testosterone. Whereas these results suggest the pro-aggressive effect of testosterone to be independent of serotonin, and not caused by an inhibition of serotonergic activity, the pCPA-induced induction of maladaptive aggression appears to require the presence of the hormone. In line with these findings, pCPA enhanced the total time of attack as well the relative time spent on attacks but not threats also in wild-type gonadally intact male C57Bl/6 mice, but failed to reinstate aggression in mice rendered hypo-aggressive by early knock-out of androgen receptors in the brain (AR(NesDel) mice). We conclude that androgenic deficiency does not dampen aggression by unleashing an anti-aggressive serotonergic influence; instead serotonin seems to modulate aggressive behavior by exerting a parallel-coupled inhibitory role on androgen-driven aggression, which is irrelevant in the absence of the hormone, and the arresting of which leads to enhanced maladaptive aggression.
38.	Sundbom, Magnus, et al. (författare) High acquisition rate and internal validity in the Scandinavian Obesity Surgery Registry 2021 Ingår i: Surgery for Obesity and Related Diseases. - : Elsevier. - 1550-7289 .- 1878-7533. ; 17:3, s. 606-614 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: The Scandinavian Obesity Surgery Registry (SOReg) is a national quality register that has collected data on bariatric surgery in Sweden since 2007.OBJECTIVE: Evaluate the acquisition rate and internal validity of entered data in SOReg as well as completeness.SETTINGS: National quality register, Sweden.METHOD: The acquisition rate during 2012-2018 was compared with Swedish national databases, while registered data in 89 selected variables (67 mandatory) was compared with medical records of 1860 randomly selected patients from all bariatric centers (n = 39-43) reporting to SOReg. The evaluation was done by 1 independent observer. Completeness of data in the entire registry for the same time period was studied.RESULTS: The acquisition rate was 97.4%, because 33,716 of 34,628 patients recorded in the National Inpatient Registry were registered in SOReg. Exact agreement of reabstracted data was seen in 99.0% of 100,200 unique entries. All studied variables had an almost perfect agreement with Cohen's kappa ranging from .87-1, that is, >.81 according to Landis and Koch criteria. In addition, .3% (n = 301) missing data entries were discovered, mostly in administrative variables. In the mandatory variables, overall completeness was high; however, declining with time in parallel with reduced follow-up rate, 50% at 5 years.CONCLUSION: The high acquisition rate and internal validity implies that SOReg reflects Swedish bariatric surgery on a nationwide basis. Hence, SOReg data can be used to monitor quality of care and in research. The overall completeness could be improved by a higher registration rate during long-term follow-up.
39.	Sundbom, Magnus, et al. (författare) Substantial Decrease in Comorbidity 5 Years After Gastric Bypass: A Population-based Study From the Scandinavian Obesity Surgery Registry. 2017 Ingår i: Annals of Surgery. - Philadelphia PA, USA : Lippincott Williams & Wilkins. - 0003-4932 .- 1528-1140. ; 265:6, s. 1166-1171 Tidskriftsartikel (refereegranskat)abstract Objective: To evaluate effect on comorbid disease and weight loss 5 years after Roux-en-Y gastric bypass (RYGB) surgery for morbid obesity in a large nationwide cohort. Background: The number patients having surgical procedures to treat obesity and obesity-related disease are increasing. Yet, population-based, long-term outcome studies are few. Methods: Data on 26,119 individuals [75.8% women, 41.0 years, and body mass index (BMI) 42.8 kg/m2] undergoing primary RYGB between May 1, 2007 and June 30, 2012, were collected from 2 Swedish quality registries: Scandinavian Obesity Surgery Registry and the Prescribed Drug Registry. Weight, remission of type 2 diabetes mellitus, hypertension, dyslipidemia, depression, and sleep apnea, and changes in corresponding laboratory data were studied. Five-year follow-up was 100% (9774 eligible individuals) for comorbid diseases. Results: BMI decreased from 42.8 ± 5.5 to 31.2 ± 5.5 kg/m2 at 5 years, corresponding to 27.7% reduction in total body weight. Prevalence of type 2 diabetes mellitus (15.5%–5.9%), hypertension (29.7%–19.5%), dyslipidemia (14.0%–6.8%), and sleep apnea (9.6%–2.6%) was reduced. Greater weight loss was a positive prognostic factor, whereas increasing age or BMI at baseline was a negative prognostic factor for remission. The use of antidepressants increased (24.1%–27.5%). Laboratory status was improved, for example, fasting glucose and glycated hemoglobin decreased from 6.1 to 5.4 mmol/mol and 41.8% to 37.7%, respectively. Conclusions: In this nationwide study, gastric bypass resulted in large improvements in obesity-related comorbid disease and sustained weight loss over a 5-year period. The increased use of antidepressants warrants further investigation. Studies with long-term results after bariatric surgery are surprisingly rare, 1–5 especially in the light of the large number of procedures performed worldwide. In most studies there is a 1 to 2-year follow-up, 6 and at such an early point in time, it is impossible to evaluate the true effect of gastric bypass, because patients have just reached their nadir in weight. Moreover, for this group of patients, the longstanding remission of obesity-related comorbidities, for example, diabetes mellitus, hypertension, dyslipidemia, and sleep apnea, are of utmost importance. The Scandinavian Obesity Surgery Registry (SOReg) was launched in 2007 as a quality registry for the expanding number of bariatric surgeries in Sweden. 7 In 2015, SOReg contained more than 50,000 bariatric procedures (>98% national coverage), with all 43 operating centers reporting to the registry. There has been an expansion of bariatric surgery, with 3300 bariatric procedures performed in 2008, 4800 in 2009, 7800 in 2010, and 8600 in 2011. There has been a slight decrease in procedures, and currently approximately 7000 performed annually, and approximately 95% of the reported procedures have been primary laparoscopic gastric bypass. 8 Perioperative complication rates (eg, 1.2% leaks) and mortality are low (0.04%), the latter validated with the Swedish Population Register. Regular audits are performed by randomly comparing data in SOReg with patient charts at the surgical centers, demonstrating a high validity with less than 2% incorrect values. 7 Furthermore, by cross-linkage with the national Prescribed Drug Registry (PDR), a 100% follow-up of the occurrence of comorbid disease (defined as medical treatment) can be achieved. The present study reports outcome in weight and obesity-related comorbid disease in a nationwide cohort of 26,119 individuals over 5 years after primary Roux-en-Y gastric bypass (RYGB) in Sweden, using the prospective SOReg database with cross-linkage with the PDR.
40.	Alfonsson, Sven, 1977- (författare) Impulsivity, Negative Mood, and Disordered Eating in Obesity 2014 Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract Bariatric surgery is a life-altering procedure that leads to substantial weight loss for most patients with obesity. Psychiatric conditions that may interfere with eating behavior and other behavioral prescriptions after surgery are common. Disordered eating is an established risk factor for inferior weight loss but the effects of negative mood and impulsivity are largely unknown. This thesis aims to investigate the prevalence of and associations between these potential risk factors and eating behavior in bariatric surgery patients.Study I assessed the prevalence of adult Attention Deficits/Hyperactivity Disorder (ADHD) symptoms in bariatric surgery patients. Symptoms of adult ADHD were elevated compared to the normal population and associated with symptoms of disordered eating, anxiety, and depression.Study II investigated whether treatment with Behavioral Activation (BA) could ameliorate binge eating and other symptoms of disordered eating in patients with obesity and Binge Eating Disorder. The results showed that BA was effective in increasing activity levels and improving mood but not in ameliorating binge eating in these patients.Study III was a prospective study on disordered eating, symptoms of depression and anxiety, symptoms of adult ADHD, and alcohol risk consumption before surgery and at follow-up after 12 months. After controlling for age, no variable measured before surgery could predict weight loss after surgery. Disordered eating after surgery was associated with inferior weight loss in men and a subgroup of older female participants.The present thesis concludes that symptoms of adult ADHD are common among bariatric surgery patients and associated with disordered eating. There is no indication that symptoms of adult ADHD are associated with short-term inferior weight loss after surgery. However, adult ADHD may be a risk factor for postsurgical alcohol abuse. The treatment study showed no direct association among activity, mood, and binge eating. BA, while effective in improving mood, was found not to be an effective treatment for BED, at least in the short group format investigated.
41.	Andersson, H., et al. (författare) Transcriptional profiling of the peripheral blood response during tularemia 2006 Ingår i: Genes and Immunity. - : Springer Science and Business Media LLC. - 1466-4879 .- 1476-5470. ; 7:6, s. 503-513 Tidskriftsartikel (refereegranskat)abstract Tularemia is a febrile disease caused by the highly contagious bacterium Francisella tularensis. We undertook an analysis of the transcriptional response in peripheral blood during the course of ulceroglandular tularemia by use of Affymetrix microarrays comprising 14,500 genes. Samples were obtained from seven individuals at five occasions during 2 weeks after the first hospital visit and convalescent samples 3 months later. In total, 265 genes were differentially expressed, 95 of which at more than one time point. The differential expression was verified with real-time quantitative polymerase chain reaction for 36 genes (R(2)=0.590). The most prominent changes were noted in samples drawn on days 2-3 and a considerable proportion of the upregulated genes appeared to represent an interferon-gamma-induced response and also a proapoptotic response. Genes involved in the generation of innate and acquired immune responses were found to be downregulated, presumably a pathogen-induced event. A logistic regression analysis revealed that seven genes were good predictors of the early phase of tularemia. This is the first description of the transcriptional host response to ulceroglandular tularemia and the study has identified gene subsets relevant to the pathogenesis of the disease and subsets that may serve as early diagnostic biomarkers.
42.	Andersson, Lennart, et al. (författare) Linjär algebra med geometri 1990. - 2 Bok (populärvet., debatt m.m.)
43.	Andersson, Lennart, et al. (författare) Linjär algebra med geometri 1986 Bok (populärvet., debatt m.m.)
44.	Andersson, Lennart, et al. (författare) Linjär algebra med geometri 1999 Bok (populärvet., debatt m.m.)
45.	Andreassen, Sissel, et al. (författare) Family members' experiences, information needs and information seeking in relation to living with a patient with oesophageal cancer 2005 Ingår i: European Journal of Cancer Care. - : Hindawi Limited. - 0961-5423 .- 1365-2354. ; 14:5, s. 426-34 Tidskriftsartikel (refereegranskat)abstract A qualitative study was conducted with the aim to describe family members' experiences, information needs and information seeking in relation to living with a patient suffering from oesophageal cancer. Data were collected by means of semi-structured interviews with nine family members. A content analysis was used in order to organize data. It was found that family members were not aware of the severe diagnosis and the illness caused intrusions on the family. The time following diagnosis family members' information seeking was low. They used interpersonal as well as mass media sources to obtain knowledge about and handle the uncertainty related to the illness. Some family members did not actively seek information. In conclusion, healthcare professionals are expected to improve quality of cancer care. These improvements are unlikely to occur without an understanding of family members' needs. This study shows that the family members were unprepared of receiving a diagnosis of oesophageal cancer. They emphasized the importance of including the children in the care given. Moreover, the whole family was faced with uncertainty, which led to intrusion on everyday life. Therefore, family members used different strategies for managing the uncertainty, whereof one was searching for information. The primary source of information was the physician.
46.	Andreassen, Sissel, et al. (författare) Information needs following a diagnosis of oesophageal cancer; self-perceived information needs of patients and family members compared with the perceptions of healthcare professionals : a pilot study 2007 Ingår i: European Journal of Cancer Care. - : Hindawi Limited. - 0961-5423 .- 1365-2354. ; 16:3, s. 277-85 Tidskriftsartikel (refereegranskat)abstract This pilot study was undertaken to describe patients' and family members' information needs following a diagnosis of oesophageal cancer and healthcare professionals' (HCP) perceptions concerning patients' and family members' information needs. Another aim was to describe patients' and family members' satisfaction with information provided. Data were collected by means of a self-report questionnaire. A total of 15 patients, 16 family members and 34 HCP participated. Patients and family members consider most information to be important. The high rating for information about tests/treatment and self-care means that both patients and family members consider this to be the most important areas of information. Healthcare professionals tend to underestimate both patients' and family members' needs for information. Patients and family members were only partly satisfied with the information received, with patients in general more satisfied with information given compared with family members. Patients' and family members' needs for information following a diagnosis of oesophageal cancer are substantial and have not been adequately met by HCP. A qualitative study might be helpful to complete the description of patients' and family members' needs. If a questionnaire is employed, it ought to be less extensive.
47.	Andreassen, Sissel (författare) Life Situation, Information Needs, and Information Seeking in Patients with Oesophageal Cancer and their Family Members 2006 Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract This thesis explores the experiences of living with oesophageal cancer from the perspective of patients and family members. Also, their needs for information and how they seek information in relation to the illness were investigated. The thesis comprises one qualitative meta-analysis and three empirical studies including data from patients, family members, and health-care professionals. Paper I was a qualitative meta-analysis the aim of which was to extend knowledge about patients' and family members' experiences of living with oesophageal cancer and clinically similar cancer forms, mainly head and neck cancer. As a result of the thematic analysis we have shown that both patients and family members 'run into an unpredictable enemy'. Patients had to 'endure a fading body' Running into an unpredictable enemy and enduring a fading body led to -entering social silence' for patients and family members.The aim of paper II was to describe patients' experiences of living with oesophageal cancer and how they seek information in relation to the illness. Data was collected by qualitative interviews with thirteen patients and analysed by qualitative content analysis. The findings describe patients' experiences of receiving the diagnosis, their experiences of vague symptoms, and of existential concerns evoked by the illness. Undergoing investigations and treatment caused extreme tiredness. Patients experienced that the illness intruded upon their daily life. In order to manage the life-threatening illness- they sought information about the illness.The aim of paper III was to describe family members' experiences of living with a patient suffering from oesophageal cancer, their information needs and information seeking Data was collected by means of qualitative interviews with nine family members and analysed by qualitative content analysis. The findings describe that family members lacked awareness of the disease. When faced with the diagnosis, shock, stress, and disbelief were evoked . The cancer illness became intrusive into their everyday lives, routines, and life plans. Uncertainty about the course and prognosis of the disease was the main source of distress among them. In order to learn, obtain understanding for the illness, and manage this uncertainty, family members entrusted themselves to the experts and sought information from them.Paper IV was a pilot study the aim of which was to describe patients' and family members' information needs following a diagnosis of oesophageal cancer, their satisfaction with information obtained, and health-care professionals' perceptions concerning patients' and family members' information needs. Data was collected by means of a study-specific questionnaire and analysed with descriptive statistics. The results indicate that patients' and family members need for information following a diagnosis of oesophageal cancer was substantial and had not been adequately met by health-care professionals.In conclusion, the receipt of the diagnosis of oesophageal cancer was an abrupt change from feeling healthy with vague symptoms to having a life-threatening illness. The illness disrupts patients' and family members' social world and relationships, and the whole family is affected. For understanding and managing the illness, they sought information from health-care professionals, social networks, and various media
48.	Andreassen, Sissel, et al. (författare) Patients' experiences of living with oesophageal cancer 2006 Ingår i: Journal of Clinical Nursing. - : Wiley. - 0962-1067 .- 1365-2702. ; 15:6, s. 685-95 Tidskriftsartikel (refereegranskat)abstract AIMS: The aim of this study is to describe patients' experiences of living with oesophageal cancer and how they seek information. BACKGROUND: Oesophageal cancer is a devastating disease with poor prognosis. Nursing care for individuals with oesophageal cancer requires increased knowledge of how they experience illness and how it affects them. METHOD: Data were collected by semi-structured, qualitative interviews with 13 participants. Content analysis was used to analyse data. RESULTS: Four themes were identified: (i) Experiences of becoming a patient diagnosed with oesophageal cancer is distinguished by the participants' experiences of vague symptoms, of receiving the diagnosis and of existential concerns evoked by the illness. (ii) Experiences of undergoing investigations and treatment consist of the participants' experiences of extreme tiredness in relation to investigations and treatment. (iii) Experiences of intrusions in daily life is conceptualized by the participants' experiences of how the illness influenced their daily life. (iv) Managing a life-threatening illness consists of a variety of strategies, which the participants employed to manage their life-threatening illness. CONCLUSIONS: The participants were unprepared of receiving a diagnosis of oesophageal cancer. Dysphagia, fatigue and uncertainty influenced the participants' everyday life. To manage the illness one of their strategies was seeking for information. The physicians were considered the main source of information, but family as well as friends with medical knowledge were also acknowledged as valuable sources. RELEVANCE TO CLINICAL PRACTICE: Understanding patients' experiences of living with oesophageal cancer is important to improve nursing care. When caring for these patients, focus ought to be on the whole family. In nursing care, it is important to be aware of the effects of dysphagia and fatigue. Health-care professionals ought to organize meetings with fellow patients and recommend literature and websites that provide patients with high quality information.
49.	Arner, Peter, et al. (författare) Variations in the size of the major omentum are primarily determined by fat cell number 2013 Ingår i: Journal of Clinical Endocrinology and Metabolism. - : The Endocrine Society. - 0021-972X .- 1945-7197. ; 98:5, s. E897-E901 Tidskriftsartikel (refereegranskat)abstract OBJECTIVE: Accumulation of visceral adipose tissue (VAT) is strongly linked to insulin resistance. Variations in the size of any adipose depot are determined by alterations in adipocyte volume and/or number. The individual contribution of each of the latter factors was determined in the major omentum, a fully resectable VAT depot.SUBJECTS: Total removal of the major omentum (omentectomy) was performed in conjunction with bariatric surgery in 55 obese patients. Tissue weight as well as mean adipocyte size and number in the omentum were determined. In subgroups, total VAT was estimated by computerized tomography (n = 17) or dual-energy x-ray absorptiometry (n = 34).RESULTS: The weight of the major omentum (on average 0.6 kg) correlated significantly with total VAT mass estimated by computerized tomography or dual-energy x-ray absorptiometry (r = 0.48-0.7; P < .01). Omental weight in relation to total body fat correlated with several features of the metabolic syndrome and inversely with serum-leptin (P < .001). Mean adipocyte size and total adipocyte number correlated strongly with omental weight (r = 0.6-0.8; P < .0001), irrespective of body mass index and total body fat mass, and accounted almost in total for interindividual variations in omental size. However, stepwise regression analysis demonstrated that adipocyte number was significantly (P < .0001) more important (62%) than adipocyte size (35%).CONCLUSION: The size of the major omentum is representative for VAT mass and correlates with a pernicious metabolic profile. Variations in omental weight are primarily determined by adipocyte number and to a lesser degree by adipocyte size, suggesting that increased VAT mass in obesity is predominantly dependent on adipocyte proliferation.
50.	Berglind, Daniel, et al. (författare) Longitudinal assessment of physical activity in women undergoing Roux-en-Y gastric bypass 2015 Ingår i: Obesity Surgery. - : Springer Science and Business Media LLC. - 0960-8923 .- 1708-0428. ; 25:1, s. 119-125 Tidskriftsartikel (refereegranskat)abstract Background: Patients undergoing bariatric surgery do not seem to increase objectively measured physical activity (PA) after surgery, despite substantial weight loss. The aims of the present study were (i) to objectively characterize 3 months pre-surgery to 9 months postsurgery PA and sedentary behavior changes in women undergoing Roux-en-Y gastric bypass (RYGB) using tri-axial accelerometers and (ii) to examine associations between pre-surgery versus postsurgery PA and sedentary behavior with anthropometric measures taken in home environment.Methods: Fifty-six women, with an average pre-surgery body mass index (BMI) of 37.6 (SD 2.6) and of age 39.5 years (SD 5.7), were recruited at five Swedish hospitals. PA was measured for 1 week by the Actigraph GT3X+ accelerometer, and anthropometric measures were taken at home visits 3 months pre-surgery and 9 months postsurgery, thus limiting seasonal effects.Results: Average BMI loss, 9 months postsurgery, was 11.7 (SD 2.7) BMI units. There were no significant pre- to postsurgery differences in PA or sedentary behavior. However, pre-surgery PA showed negative association with PA change and positive association with postsurgery PA. Adjustments for pre-surgery BMI had no impact on these associations.Conclusions: No significant differences were observed in objectively measured changes in PA or time spent sedentary from 3 months pre-surgery to 9 months postsurgery among women undergoing RYGB. However, women with higher pre-surgery PA decreased their PA postsurgery while women with lower pre-surgery PA increased their PA.

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