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Aim Bariatric surgery has been the most efficient treatment option for moderate to severe obesity. Recently, the sleeve gastrectomy (SG) has become the most widely performed bariatric surgery. However, the one-anastomosis gastric bypass (OAGB) has exponentially increased recently and is associated with excellent short- and long-term weight loss benefits. Hence, the aim of this review is to compare the effectiveness of OAGB vs SG in short- (≤ 1 year) and long-term (&amp;gt; 1 year) weight loss. Method A comprehensive literature search of PubMed, Scopus and Google Scholar databases were conducted. Search criteria included keywords such as one-anastomosis gastric bypass, mini-gastric bypass, omega-loop gastric bypass, sleeve gastrectomy, short-term weight loss and long-term weight loss. Selection criteria included any randomised controlled trials (RCTs) and cohort studies comparing the effects of OAGB vs SG in weight loss, published from the years 2010 onwards. Only full text studies and papers published in English language were chosen. Results nine studies were selected to be reviewed in this study. 62.5% of studies which had reports for short-term weight loss showed that OAGB was able to achieve a significantly greater % excess weight loss (%EWL) or % excess BMI loss (%EBMIL) (P &amp;lt; 0.05). Whereas 80% of studies which had reports for long-term weight loss showed that OAGB achieved a significantly greater %EWL or %EBMIL, up to five years. Conclusions This review suggests that OAGB is associated with significantly greater short-and long-term weight loss than SG. However, due to the small number of RCTs on OAGB vs SG, more long-term RCTs should be conducted for greater evaluation.

1139 Effectiveness of One-Anastomosis Gastric Bypass Vs Sleeve Gastrectomy in Short- And Long-Term Weight Loss – A Review