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Objective: To define "best possible" outcomes for secondary bariatric surgery (BS)., Background: Management of poor response and of long-term complications after BS is complex and under-investigated. Indications and types of reoperations vary widely and postoperative complication rates are higher compared to primary BS., Methods: Out of 44,884 BS performed in 18 high-volume centers from 4 continents between 06/2013-05/2019, 5,349 (12%) secondary BS cases were identified. Twenty-one outcome benchmarks were established in low-risk patients, defined as the 75th percentile of the median outcome values of centers. Benchmark cases had no previous laparotomy, diabetes, sleep apnea, cardiopathy, renal insufficiency, inflammatory bowel disease, immunosuppression, thromboembolic events, BMI> 50 kg/m2 or age> 65 years., Results: The benchmark cohort included 3143 cases, mainly females (85%), aged 43.8 ± 10 years, 8.4 ± 5.3 years after primary BS, with a BMI 35.2 ± 7 kg/m2. Main indications were insufficient weight loss (43%) and gastro-esophageal reflux disease/dysphagia (25%). 90-days postoperatively, 14.6% of benchmark patients presented ≥1 complication, mortality was 0.06% (n = 2). Significantly higher morbidity was observed in non-benchmark cases (OR 1.37) and after conversional/reversal or revisional procedures with gastrointestinal suture/stapling (OR 1.84). Benchmark cutoffs for conversional BS were ≤4.5% re-intervention, ≤8.3% re-operation 90-days postoperatively. At 2-years (IQR 1-3) 15.6% of benchmark patients required a reoperation., Conclusion: Secondary BS is safe, although postoperative morbidity exceeds the established benchmarks for primary BS. The excess morbidity is due to an increased risk of gastrointestinal leakage and higher need for intensive care. The considerable rate of tertiary BS warrants expertise and future research to optimize the management of non-success after BS., Competing Interests: Conflict of Interest Statement: Prof. Peterli reports consulting fees from Johnson & Johnson, outside the submitted work. Prof. Bueter reports personal fees from Johnson & Johnson and Medtronic, outside the submitted work. Prof. Himpens reports personal fees from Ethicon, personal fees from Medtronic, outside the submitted work. Dr. Dillemans reports consulting fees from Medtronic and Johnson & Johnson, outside the submitted work. Prof. Lannoo reports an unrestricted grant from Medtronic. The other authors have no commercial associations to disclose., (Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved.)

Background: Internal herniation (IH) is a well-known complication after laparoscopic gastric bypass (LGB). Diagnosing and managing IH can be challenging. This retrospective cohort study aimed to achieve a greater understanding of symptomatology, diagnostic tools, complications, risk of IH recurrence, and symptom relief in IH patients., Methods: We included patients who underwent LGB surgery at our institution between 2011 and 2015. Mesenteric defects were not preventively closed during LGB. We focused on LGB patients who underwent surgical intervention(s) for suspected IH during a 7-year study period. We studied patient characteristics, (predictive) symptoms and signs, abdominal imaging, operative findings, post-operative course, and risk of (recurrent) IH., Results: A total of 1588 patients were included. In total, 243 patients underwent IH-related diagnostic laparoscopy. Radiating pain to the back (OR 2.45, p = .03), post-prandial pain (OR 3.23, p = .00), and leukocytosis (OR 15.53, p = .01) were identified as predictors of IH. The estimated risk of IH-related diagnostic laparoscopy was 16% at 3 years post-LGB, and the risk of confirmed IH was 12%. The estimated risk of diagnostic laparoscopy for suspected recurrent IH was 10% at 5 years post-LGB. In patients who underwent secondary mesenteric defects closure, post-operative symptom relief was reported in 84%., Conclusion: This study demonstrates a considerable risk of developing IH after LGB without preventive closure of the mesenteric defects. We emphasize the value of diagnostic laparoscopy to achieve symptom relief in patients with suspicion of IH. Preoperative diagnosis of IH can be improved by being watchful of specific symptoms and signs which can predict the intra-operative presence of IH.