{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T11:46:18Z","timestamp":1753875978058,"version":"3.41.2"},"reference-count":0,"publisher":"Oxford University Press (OUP)","issue":"Supplement_5","license":[{"start":{"date-parts":[[2025,2,1]],"date-time":"2025-02-01T00:00:00Z","timestamp":1738368000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,2,26]]},"abstract":"Abstract<\/jats:title>\n \n Introduction<\/jats:title>\n After bariatric surgery, insufficient weight loss (IWL)\u2014a failure to achieve sufficient weight loss\u2014is the main reason for undergoing a second revisional bariatric surgery. Not only is a standardized definition for IWL missing, but its pre-, peri, and postoperative predictor factors remain unclear. This study aims to assess rates of IWL two years after bariatric surgery, applying 4 definitions; and identify predictors of IWL to improve patient counselling regarding their prevention and optimize intraoperative bariatric procedures.<\/jats:p>\n <\/jats:sec>\n \n Methods<\/jats:title>\n We conducted a single-centre retrospective cohort study with 1056 consecutive patients submitted to bariatric surgery between 2019 and 2021. Regarding IWL, the following four definitions were applied: (1) body mass index (BMI) higher than 35 kg\/m2 at 24 months; (2) percentage of excess weight loss (%EWL) of less than 50% at 18 months; (3) percentage of total weight loss (%TWL) of less than 20% at 24 months; (4) percentage of alterable weight loss (%AWL) of less than 35% at 24 months. All participants were followed for at least 2 years. Univariate and multivariate analyses were performed using logistic regression to compute the odds ratio (OR) and the 95% confidence intervals (95%c.i.).<\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n A total of 1056 patients were included, with a mean age of 45.8 (\u00b110.3) years, of which 82.9% were female. Significant insufficient weight loss rates ranged from 6 to 14% depending on the definition, being the %EWL the definition with the highest proportion of patients with IWL. Considering %TWL as the definition for IWL, patients with IWL had significantly longer hospital time response (adjusted odds ratio: 1.03, 95% c.i.: 1.02\u20131.05) and were more submitted to sleeve gastrectomy (adjusted odds ratio: 2.51, 95% c.i.: 1.46\u20134.30). Male gender was associated with IWL only considering the first definition (BMI &gt; 35 kg\/m2) (adjusted odds ratio: 3.55, 95% c.i.: 2.36\u20135.33) and the second definition (%EWL) (adjusted odds ratio: 4.43, 95% c.i.: 2.80\u20137.02). The multivariate analysis showed that a longer hospital response and sleeve gastrectomy were independent predictors of IWL after bariatric surgery, regardless of the definition.<\/jats:p>\n <\/jats:sec>\n \n Conclusion<\/jats:title>\n The predictors of insufficient weight loss varied depending on the definition applied. However, regardless of the IWL\u2019s definition, a longer hospital response and sleeve gastrectomy were independent predictors of insufficient weight loss after bariatric surgery.<\/jats:p>\n <\/jats:sec>","DOI":"10.1093\/bjs\/znaf036.006","type":"journal-article","created":{"date-parts":[[2025,2,26]],"date-time":"2025-02-26T05:16:33Z","timestamp":1740546993000},"source":"Crossref","is-referenced-by-count":0,"title":["IBC Oxford University Oral Abstract 6 - Definition and predictors of insufficient weight loss after bariatric surgery: a retrospective cohort study"],"prefix":"10.1093","volume":"112","author":[{"given":"F Amorim","family":"Cruz","sequence":"first","affiliation":[]},{"given":"H Santos","family":"Sousa","sequence":"additional","affiliation":[]},{"given":"J","family":"Nogueiro","sequence":"additional","affiliation":[]},{"given":"S","family":"Vaz","sequence":"additional","affiliation":[]},{"given":"J P","family":"Vieira Sousa","sequence":"additional","affiliation":[]},{"given":"J","family":"Lemos","sequence":"additional","affiliation":[]},{"given":"B","family":"Peleteiro","sequence":"additional","affiliation":[]},{"given":"F","family":"Resende","sequence":"additional","affiliation":[]},{"given":"A Costa","family":"Pinho","sequence":"additional","affiliation":[]},{"given":"J","family":"Preto","sequence":"additional","affiliation":[]},{"given":"P","family":"Freitas","sequence":"additional","affiliation":[]},{"given":"S","family":"Carneiro","sequence":"additional","affiliation":[]},{"given":"E Lima","family":"da Costa","sequence":"additional","affiliation":[]}],"member":"286","published-online":{"date-parts":[[2025,2,26]]},"container-title":["British Journal of Surgery"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/academic.oup.com\/bjs\/article-pdf\/112\/Supplement_5\/znaf036.006\/62170291\/znaf036.006.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/academic.oup.com\/bjs\/article-pdf\/112\/Supplement_5\/znaf036.006\/62170291\/znaf036.006.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,3,4]],"date-time":"2025-03-04T20:27:20Z","timestamp":1741120040000},"score":1,"resource":{"primary":{"URL":"https:\/\/academic.oup.com\/bjs\/article\/doi\/10.1093\/bjs\/znaf036.006\/8042611"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,2]]},"references-count":0,"journal-issue":{"issue":"Supplement_5","published-online":{"date-parts":[[2025,2,26]]},"published-print":{"date-parts":[[2025,2,26]]}},"URL":"https:\/\/doi.org\/10.1093\/bjs\/znaf036.006","relation":{},"ISSN":["0007-1323","1365-2168"],"issn-type":[{"type":"print","value":"0007-1323"},{"type":"electronic","value":"1365-2168"}],"subject":[],"published-other":{"date-parts":[[2025,2]]},"published":{"date-parts":[[2025,2]]},"article-number":"znaf036.006"}}