Safety and efficacy of laparoscopic sleeve gastrectomy in patients with portal hypertension with liver function of Childs A.

INTRODUCTION: Advanced liver disease and portal hypertension (PH) are seen as a relative contraindication for bariatric and metabolic surgery. Several studies have shown significant improvement in liver function and liver histology after bariatric surgery. There are very few studies describing bariatric surgery in patients with PH. The purpose of this retrospective study is to evaluate the feasibility and results of laparoscopic sleeve gastrectomy (SG) in patients with PH. MATERIAL AND METHODS: We present our experience of performing laparoscopic SG in 15 patients with evidence of PH. All the patients were Childs Pugh Criteria A. PH was confirmed by the presence of dilated esophageal varices on endoscopy. RESULTS: The mean operative time was 77.33 ± 15.22 min and mean blood loss was 80.67 ± 37.12 ml. The mean length of stay was 2.73 ± 0.59 days. There were no intraoperative or immediate postoperative complications. None of the patients required blood transfusion in the postoperative period. The weight, BMI, Excess body weight loss% (EBWL%), Total weight loss (TWL) and TWL% at 1 year were 86.05 ± 14.40 kg, 31.16 kg/m2 ± 3.82, 63.84% ± 15.24, 31.49 ± 9.54 kg and 26.50 ± 5.42%, respectively. Diabetes and hypertension resolution at 1 year was 80% and 72.72%, respectively. All the patients were followed up for mean 3 ± 1.5 years. There were no immediate or long-term morbidity and mortality noted. CONCLUSION: SG is a feasible and safe option for the treatment of obesity in carefully selected patients with PH with good weight loss and comorbidity resolution.

Efficacy and Safety of Bariatric Surgery in Dutch People Living with HIV: a Retrospective Matched Cohort Analysis.

PURPOSE: Obesity is rising among people with HIV (PLWH), sparking interest in bariatric surgery (BS) for this group. Yet, large-scale comparative research on BS outcomes in PLWH is lacking. METHODS: We performed a retrospective, matched cohort analysis in PLWH and HIV uninfected controls. Subjects were retrieved from the Dutch Audit for Treatment of Obesity (DATO) registry. Matching (1:7 ratio) included age (± 5-years), sex, body-mass index (BMI) of ± 3 kg/m2, surgery type, and associated health problems (AHPs) at baseline. The primary endpoint was total weight loss percentage (%TWL) ≥ 20% achieved at 1-year post-BS. Secondary endpoints were cumulative %TWL achieved at 2-years post-BS, a reported remission or improvement in AHPs post-BS, and surgical complications, both at 1-year post-BS. Comparisons were performed using conditional logistic regression. RESULTS: Twenty-seven PLWH and 168 controls were included. At 1-year post-BS, 89% PLWH achieved ≥ 20%TWL, compared to 94% of controls (p = 0.4). Cumulative %TWL at 2-years post-BS were 82% and 92% in PLWH and controls, respectively (p = 0.2). Improvement rates in hypertension and type 2 diabetes mellitus were 50% and 86% in PLWH, versus 87% and 87% in controls. Full remission occurred in 20% and 71% of PLHIV, versus 49% and 44% of controls, respectively. No improvement or remission was observed for dyslipidaemia in PLHIV compared to 54% improvement and 29% remission in controls. Surgical complications were 0% in PLHIV and 13% (n = 21) in controls. CONCLUSION: Efficacy and safety outcomes of BS were similar between PLWH and controls except for the lack of improvement in dyslipidaemia in PLWH.

Adherence to Dietary Behavior Recommendations Moderates the Effect Between Time Since Metabolic and Bariatric Surgery and Percentage Total Weight Loss.

PURPOSE: Metabolic and bariatric surgery (MBS) is the gold standard in treating severe obesity. Previous research implies that different psychological and behavior-related factors might be critical for MBS' sustained success. Yet adherence to dietary behavior recommendations and its impact on weight development is rarely examined. This study investigated the relationship between adherence to dietary behavior recommendations and the percentage of total weight loss (%TWL) after MBS. MATERIALS AND METHODS: This study is a cohort study (acquisition in Germany). N = 485 patients after MBS, being in grade III of obesity (body mass index (BMI) ≥ 40 kg/m2) pre-MBS, were included. Participants answered a standardized assessment on the relevant constructs, including adherence to dietary behavior recommendations, depression symptoms, weight, diet, and MBS characteristics. RESULTS: BMI pre-MBS, type of MBS, age, regularity of physical activity, and depression symptoms were identified as significant covariates of %TWL and adherence. Within 6 months after MBS, adherence seems to peak, F(5,352) = 12.35, p < .001. Adherence and time since MBS predict %TWL. A higher adherence (moderator) is related to a higher %TWL, R2 = 52.65%, F(13,344) = 31.54, p < .001. CONCLUSION: After MBS, adherence to dietary behavior recommendations seems crucial for maximizing its success. Implications for the optimization of MBS' success in aftercare management arise. In particular, behavior modification interventions should be routinely implemented.

LSG vs OAGB: 7-Year Follow-up Data of a Randomised Control Trial and Comparative Outcome Based on BAROS Score.

BACKGROUND: This study aims to evaluate and compare long-term results of laparoscopic sleeve gastrectomy (LSG) and one anastomosis gastric bypass (OAGB) based on bariatric analysis reporting and outcome system (BAROS) score. MATERIALS AND METHODS: Patients operated for morbid obesity between 2013 and 2015 were randomised to LSG and OAGB groups. Based on inclusion and exclusion criteria, 201 patients (100 LSG and 101 OAGB) were analysed for changes in total body weight (TBW), body mass index (BMI), percent excess weight loss (%EWL), percent total weight loss (%TWL), QoL (quality of life) scores, comorbidity resolution and outcome based on BAROS at 7 years. RESULTS: Sixty-six LSG and 64 OAGB patients were followed up at 7 years. Mean pre-operative TBW and BMI were 119 ± 28.2 and 44.87 ± 7.71 for LSG group and 113.25 ± 23.74 and 44.71 ± 8.75 for OAGB group respectively. At 7 years after surgery, there was significant drop in mean TBW and BMI in both groups. Mean %EWL for LSG and OAGB patients was 50.78 ± 28.48 and 59.99 ± 23.32 and mean %TWL for LSG and OAGB patients was 23.22 ± 12.66 and 27.71 ± 12.27 respectively. Mean QoL scores at 7 years were significantly higher than the pre-operative scores and most of the patients in both groups had remission or improvement in their comorbidities. 68.76% OAGB patients had very good or excellent outcome on BAROS score while only 36.37% LSG patients had similar outcome. CONCLUSIONS: LSG and OAGB are successful bariatric procedures over the long term. OAGB outperforms LSG and has significantly higher %EWL and %TWL over the long term.

Quality of Care Transition During Hospital Discharge, Patient Safety, and Weight Regain After Bariatric Surgery: a Cross-Sectional Study.

PURPOSE: Bariatric surgery is established as the gold standard in the treatment of severe obesity. However, a significant proportion of patients experience a substantial weight regain afterwards. Previous research focused predominantly on patients' personal factors. Yet, critical discharge process factors that contribute to patient's adherence after surgical interventions are rarely examined. This study investigated whether high quality of care transitions in discharge management influences weight regain and the likelihood of experiencing adverse patient safety incidents. MATERIALS AND METHODS: A cross-sectional study with 578 patients after bariatric surgery was conducted. Participants answered a standardized assessment on the quality of care transition from hospital to home-, surgery-, and nutrition-related characteristics as well as patient safety incidents. RESULTS: Significant weight regain was observed 24 months after surgery. The association between time since surgery and weight regain was weaker in patients with high quality of care transitions (B = 2.27, p < .001). Higher quality of care transition was also significantly related to a lower likelihood of unplanned hospital readmissions (OR = 0.67) and fewer medication complications (OR = 0.48) after surgery. CONCLUSION: This study sheds first light on the key influence of high quality of care transitions after bariatric surgery. Improvement efforts into effective discharge processes may establish smoother care transitions and help patients to assume responsibility and compliance with behavioral recommendations after surgery. Moreover, adverse patient safety incidents are less frequent after high quality care transitions indicating both high quality of health services for patients and reducing costs for the health care system.

Efficacy of Bariatric Surgery in the Treatment of Women With Obesity and Polycystic Ovary Syndrome.

CONTEXT: The comparative effectiveness of drugs and surgical therapy for women with obesity and polycystic ovary syndrome (PCOS) has not been systematically compared. OBJECTIVE: We aimed to determine the difference in efficacy between drug and bariatric surgery therapy for women with obesity and PCOS. METHODS: This prospective nonrandomized trial enrolled 90 women aged 18 to 40 years with body mass index (BMI) ≥ 27.5 kg/m2 and waist circumference ≥ 85 cm and fulfilling the 2011 Chinese diagnostic criteria for PCOS; 81 subjects completed the study. In the drug group, patients were administered metformin and an oral contraceptive containing ethinyl-estradiol and cyproterone acetate for the first 6 months, and metformin alone for the second 6 months. In the surgical group, patients underwent laparoscopic sleeve gastrectomies. The follow-up period was 12 months. The main outcome was the complete remission of PCOS, requiring 6 consecutive regular menstruation cycles or spontaneous pregnancy. RESULTS: Median BMI at endpoint was 30.1 kg/m2 in the drug group and 23.7 kg/m2 in the surgical group; complete remission rate was 15% and 78%, respectively. Except endpoint BMI, no difference was observed in free androgen index, ovarian morphology, homeostasis model assessment for insulin resistance, and total weight loss between remission and nonremission patients. Logistic regression analyses also revealed that the final BMI was the major factor influencing the remission of PCOS. The cutoff points for the final BMI were 27.5 kg/m2 for the drug group and 26 kg/m2 for the surgical group. Overall, nearly 95% of patients with an endpoint BMI below the cutoff values achieved complete remission. CONCLUSION: Complete remission of PCOS in patients with obesity depends on the final BMI after weight loss. Thus, bariatric surgery should be prioritized for these patients.

Reporting Weight Loss 2021: Position Statement of the Dutch Society for Metabolic and Bariatric Surgery (DSMBS).

Prevailing recommendations on reporting weight loss after bariatric and metabolic surgery are not evidence-based. They promote the outcome metric percentage excess weight loss (%EWL), sometimes indicated as percentage excess body mass index loss (%EBMIL). Many studies proved that this popular outcome measure, in contrast to other weight loss metrics, is inaccurate and error-sensitive when comparing weight loss within and between studies. It is inappropriate for assessing poor weight loss response and weight regain as well. The percentage (total) weight loss metric is the best alternative. The Dutch Society for Metabolic and Bariatric Surgery (DSMBS) recommends to stop using the %EWL (or %EBMIL) metric as primary outcome measure in all cases and calls on the International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO) to propagate this evidence-based recommendation.

What Is Weight Loss After Bariatric Surgery Expressed in Percentage Total Weight Loss (%TWL)? A Systematic Review.

Percentage total weight loss (%TWL) might be better than percentage excess weight loss to express weight loss in bariatric surgery. In this systematic review, performed according to the PRISMA statement, results of laparoscopic sleeve gastrectomy (LSG) and Roux-en-Y gastric bypass (LRYGB) are assessed in %TWL. A total of 13,426 studies were screened and 49 included, reporting data of 24,760 patients. The results show that, despite limiting data, LRYGB is favorable over LSG in terms of weight loss in short-term follow-up. Although recent guidelines recommend to use %TWL when reporting outcome in bariatric surgery, this study shows that there is still insufficient quality data in %TWL, especially on LSG. The use of %TWL as the primary outcome measure in bariatric surgery should be encouraged.

Factors Associated with Weight Loss After Metabolic Surgery in a Multiethnic Sample of 1012 Patients.

BACKGROUND: Metabolic surgery is the most effective method for weight loss in the long-term treatment of morbid obesity and its comorbidities. The primary aim of this study was to examine factors associated with percent total weight loss (%TWL) after metabolic surgery among an ethnically diverse sample of patients. METHODS: A retrospective review was performed on 1012 patients who underwent either a sleeve gastrectomy (SG) or Roux-en-Y gastric bypass (RYGB) at our institution between January 2008 and June 2015. RESULTS: African Americans had a lower %TWL than non-Hispanic/Latino Whites at 6, 9, 12, 18, and 48 months. At all timeframes, there was a negative association between pre-surgery TWL and %TWL after surgery. Female sex was negatively associated with %TWL at 3 months only. Higher initial BMI was also associated with greater post-operative %TWL at 18, 24 and 36 months. Older patients had lower %TWL at 6, 9, 12 and 24 months post-surgery. Patients who received RYGB had greater %TWL than those who received SG at 3, 6, 9, 12, 24 and 36 months. CONCLUSIONS: African Americans had a lower %TWL than non-Hispanic/Latino Whites at most time points; there were no other significant race/ethnicity or sex differences. BMI (greater initial BMI), age (lower) and RYGB were associated with a greater post-operative %TWL at certain post-surgery follow-up time points. A limitation of this study is that there was missing data at a number of time points due to lack of attendance at certain follow-up visits.

Internal Herniation and Weight Loss in Patients after Roux-en-Y Gastric Bypass.

PURPOSE: Weight loss is one of the desired outcomes after a gastric bypass, in order to reduce co-morbidity, and even mortality. However, weight loss might contribute to a serious complication: internal herniation (IH). Pre-operative diagnosis of IH is demanding. This study was conducted to investigate if percentage total weight loss (%TWL) is clinically usable in recognizing patients with IH. MATERIALS AND METHODS: Patients who had undergone a gastric bypass between 2011 and 2014 were included retrospectively if a CT scan or reoperation was performed for suspected IH between 2011 and 2016. Differences in %TWL were calculated in patients with IH and without (NO-IH). A sub analysis was done in patients with complaints. A multivariate analysis to identify risk factors for IH was performed. RESULTS: Out of 1007 patients, 31 patients were diagnosed with an IH (3.1%) after a median time of 16.5 months (range 6.5-46.1). The %TWL was higher in patients with an IH (34.2% ± 12.7) vs. NO-IH (30.8% ± 9.6). This result was also seen in patients presenting with symptoms (IH 34.2% ± 12.7 vs. NO-IH 27.0% ± 14.8). If %TWL is above 30%, IH is significantly more diagnosed in patients presenting with symptoms. A multivariate logistic model for IH in patients presenting with symptoms identified both ≥ 30%TWL (adjusted OR 3.1, 95% CI 1.1-8.8, p = 0.036) and abdominal cramping (adjusted OR 3.2, 95% CI 1.2-8.5, p = 0.0021) as risk factors. CONCLUSION: Our study showed significant more %TWL in patients with an IH. Both ≥ 30%TWL and cramping abdominal pain result in a threefold higher risk of presence of IH.

Impact of Laparoscopic Banded Gastric Bypass on Weight Loss Surgery Outcomes: 5 Years' Experience.

OBJECTIVE: Evaluate 5-year outcomes of banded gastric bypass (BRYGB) as a primary and conversion bariatric procedure. METHODS: Retrospective review of BRYGB between January 2011and March 2013. Outcomes included percentage of total weight loss (%TWL), weight loss maintenance, and band-related complications. RESULTS: One hundred forty-two patients underwent BRYGB, 106 primary and 36 conversions. Indications for conversion to BRYGB were complications of the primary procedure (n = 19), insufficient weight loss (n = 5), and weight regain (n = 12). In the primary group, mean preoperative BMI was 44.8 kg/m2 (± 6.9 kg/m2). Compared with preoperative weight, mean %TWL was 33.9% (n = 95), 34.1% (n = 82), 34.0% (n = 70), 33.9% (n = 62), and 31.8% (n = 75) after 1, 2, 3, 4, and 5 years, respectively. In conversions secondary to failed primary procedure (insufficient WL and weight regain), mean preoperative BMI was 40.8 kg/m2 (± 6.01 kg/m2). Despite one patient gaining weight, mean %TWL was 25.7% (n = 13), 28% (n = 11), 23.9% (n = 8), 18.3% (n = 8), and 15.1% (n = 12) after 1, 2, 3, 4, and 5 years, respectively. In conversions secondary to primary procedure complications (n = 19), mean preoperative BMI was 28.4 kg/m2 (± 3.5 kg/m2). After 1, 2, 3, 4, and 5 years, mean BMI was 28.1 (n = 15), 29 (n = 10), 29.8 (n = 9), 30.6 (n = 10), and 30.9 (n = 12) kg/m2, respectively. Band-related complications after 5 years: three erosion and five patients complained of persistent dysphagia. One band needed reposition. Perioperative surgical complications: two bleeding, one leakage, one port-site hernia, and one food impaction. CONCLUSION: Banded gastric bypass has good results in terms of weight loss and weight loss maintenance in both primary and conversional bariatric procedures with acceptable incidence of band-related complications.

5-Year Results of Banded One-Anastomosis Gastric Bypass: a Pilot Study in Super-Obese Patients.

BACKGROUND: The novel banded one-anastomosis gastric bypass (B-OAGB) procedure has not previously been reported in super-obese patients over the long term. In this pilot study, outcomes in patients with a mean baseline body mass index (BMI, kg/m2) of ≥ 50 who underwent B-OAGB were evaluated through 5-year follow-up. PATIENTS AND METHODS: Total weight loss (TWL), excess weight loss (EWL), BMI evolution, and changes in type 2 diabetes biomarkers were analyzed prospectively in super-obese patients who underwent B-OAGB. Paired samples t tests were used to assess weight outcome change from baseline through 5-year follow-up and 95% CIs were calculated. The Bariatric Outcomes and Reporting System (BAROS) was used to assess surgical success at 3 time points. RESULTS: Between October 2013 and February 2014, a 12-patient pilot cohort (mean baseline BMI 57.5 ± 6.3) underwent B-OAGB. No perioperative complications were observed within 30 days. Five-year mean BMI was 31.2 ± 5.4, a BMI loss of 25.9 (TWL 45.3 ± 7.5%; EWL 72.2 ± 12.8%). Between 11 and 24 months following surgery, 3 patients required band removal; each had one complication (1 stasis esophagitis and recurrent vomiting; 1 hypoalbuminemia; 1 anemia). There was no mortality. Long-term B-OAGB BAROS subscale and composite scores were comparable to other major bariatric procedures. CONCLUSIONS: In a pilot study of super-obese patients who underwent B-OAGB, excellent durable BMI loss of 25.9 kg/m2 (EWL 72.2%) at 5 years was achieved with an acceptable level of reoperation. More B-OAGB long-term follow-up studies are necessary to provide definitive conclusions regarding this combination bariatric procedure.

Analysis of mid-term weight loss after Roux-en-Y gastric bypass and sleeve gastrectomy: Proposed percentile charts for total weight loss percentages to be used in daily clinical practice. / Análisis de la pérdida ponderal a medio plazo después del bypass gastroyeyunal en Y de Roux y de la gastrectomía vertical: propuesta de gráficos de percentiles del porcentaje de peso total perdido para su uso en la práctica clínica diaria.

INTRODUCTION: The aim of this study is to analyze weight evolution after the main bariatric surgical techniques (Roux-en-Y gastric bypass [RYGB] and sleeve gastrectomy [SG]) performed at a representative sample of Spanish hospitals in order to develop percentile charts for the percentage of total weight loss during the first 3 years after surgery. METHODS: A retrospective longitudinal cohort study was conducted based on the data provided by 9 Spanish hospitals. Weight data were analyzed both in % total weight loss and % excess weight lost corresponding to the RYGB (n=1,887) and SG (n=1,210). RESULTS: RYGB continues to be the most frequently performed technique in our sample. In both surgical techniques, maximum weight loss occurred 18 months after surgery. Both techniques followed the same weight evolution, although the % total weight loss values were lower in the case of the SG after 36 months (29.3±10 vs. 33.6±10). Age and gender are decisive in the weight results (better in younger patients for both techniques and better in women for RYGB). CONCLUSIONS: Percentile charts of % total weight loss after bariatric surgery represent a very useful tool and an important advance in the quality of patient management.

Sensitivity and Specificity of 50% Excess Weight Loss (50%EWL) and Twelve Other Bariatric Criteria for Weight Loss Success.

BACKGROUND: Criteria for bariatric weight loss success are numerous. Most of them are arbitrary. None of them is evidence-based. Our objective was to determine their sensitivity and specificity. METHODS: Thirteen common bariatric weight loss criteria were compared to a benchmark reflecting the gold standard in bariatric surgery. We used an elaborate baseline BMI-independent weight loss percentile chart, based on retrospective data after laparoscopic Roux-en-Y gastric bypass (LRYGB), performed between 2007 and 2017. Percentile curves p31.6 (patients' expectation), p25 (interquartile range), p15.9 (1 standard deviation (SD) below median), and p10.9 (surgeons' goal) were used as possible cutoff for success to determine true or false positive and negative results beyond 1 year. RESULTS: We operated 4497 primary LRYGB patients, with mean follow-up 22 (± 1 SD 19; range 0-109) months, 3031 patients with last result ≥ 1 year, 518 ≥ 5 years. For all four cutoff percentile curves for success, specificities were low (2-72%) for criteria < 35 body mass index (BMI), ≥ 25percentage excess BMI loss (%EBMIL), ≥ 50%EBMIL, ≥ 15 percentage total weight loss (%TWL), ≥ 20%TWL, ≥ 25 percentage excess weight loss (%EWL), and high (83-96%) for < 30 BMI. No criterion had > 80% specificity and sensitivity for a cutoff above p15.9. For p15.9, they were both > 80% for criteria ≥ 10 BMI reduction and ≥ 50%EWL, both > 90% for ≥ 25%TWL and ≥ 35 percentage alterable weight loss (%AWL). All criteria had high sensitivities for all cutoff percentile curves (87-100%), except < 30 BMI (65-78%). CONCLUSIONS: For the first time, common bariatric criteria for weight loss success were systematically validated. Most criteria recognized success very well (high sensitivities), but ≥ 15%TWL, ≥ 20%TWL, < 35BMI, ≥ 25%EWL, ≥ 25%EBMIL, and ≥ 50%EBMIL left too many poor responders unnoticed (low specificities). Bariatric weight loss success is best assessed by comparing results to percentile curve 1 SD below median (p15.9) in a bariatric baseline BMI-independent weight loss percentile chart. Criteria ≥ 35%AWL and ≥ 25%TWL came close to that curve, both with > 90% sensitivity and specificity. Among others, criterion ≥ 50%EBMIL did not.

MGB-OAGB: Effect of Biliopancreatic Limb Length on Nutritional Deficiency, Weight Loss, and Comorbidity Resolution.

INTRODUCTION: Mini gastric bypass-one anastomosis gastric bypass (MGB-OAGB) has been approved as a mainstream metabolic/bariatric procedure by IFSO. Still there are lots of concerns regarding nutritional deficiency after MGB-OAGB. The purpose of this retrospective analysis is to evaluate the effect of biliopancreatic limb (BPL) length on weight loss, comorbidity resolution, and nutritional deficiencies in patients 1 year after MGB-OAGB and to find suitable BPL length. MATERIAL AND METHODS: One hundred and one patients who underwent MGB-OAGB were divided into three groups of 150 cm, 180 cm, and 250 cm depending on the length of BPL bypassed. The nutritional parameters (vitamin D3, vitamin B12, serum iron, serum ferritin, total protein, serum albumin, serum globulin), anthropometric measurements (weight, BMI), and comorbidity resolution (T2DM, hypertension) were compared between the three groups at 1-year follow-up. RESULTS: There was statistically significant difference in number of patients having deficiencies in all the nutritional parameters except globulin between 150 cm and 250 cm groups (P < 0.05). While on comparing 180- and 250-cm group, a statistically significant difference was present in vitamin D3, vitamin B12, and total protein (P < 0.05) only. The difference was statistically insignificant between the three groups on T2DM, hypertension resolution, and %EWL but TWL between 150 cm vs 180 cm and 150 cm vs 250 cm showed significant difference. CONCLUSION: A 150-cm BPL length is adequate with very minimal nutritional complications and good results. A 180-cm BPL can be used in super obese while a 250-cm BPL should be used with utmost care as it results in significant nutritional deficiencies.

Sleeve Gastrectomy and Roux-en-Y Gastric Bypass Lead to Comparable Changes in Body Composition after Adjustment for Initial Body Mass Index.

BACKGROUND: Bariatric surgery is a safe and established treatment option of morbid obesity. Mere percentage of excess weight loss (%EWL) should not be the only goal of treatment. METHODS: One hundred seventy-three obese patients were included in the study. They underwent either Roux-en-Y gastric bypass (RYGB; n = 127, mean body mass index (BMI) 45.7 ± 5.7 kg/m(2)) or sleeve gastrectomy (SG; n = 46, mean BMI 55.9 ± 7.8 kg/m(2)) for weight reduction. Body weight and body composition were assessed periodically by bioelectrical impedance analysis. RESULTS: After 1 year of observation, %EWL was 62.9 ± 18.0 % in RYGB and 52.3 ± 15.0 % in SG (p = 0.0024). Body fat was reduced in both procedures with a slight preference for SG, and lean body mass was better preserved in the RYGB group. Due to significant differences in the initial BMI between the two groups, an analysis of covariance was performed, which demonstrated no significant differences in the %EWL as well as in the other parameters of body composition 1 year after surgery. Using percentage of total weight loss to evaluate the outcomes between the two procedures, no significant difference was found (31.7 ± 8.4 % in RYGB and 30.5 ± 7.6 % in SG patients, p > 0.4). CONCLUSIONS: Excess weight loss is highly influenced by the initial BMI. Total weight loss seems to be a better measurement tool abolishing initial weight differences. SG and RYGB do not differ in terms of body composition and weight loss 1 year after surgery.