P45 Effect of One Anastomosis Gastric Bypass on Liver Function Tests: A comparison between 150 cm and 200 cm Bilio-Pancreatic Limb

INTRODUCTION: The effect of One Anastomosis Gastric Bypass (OAGB) on Liver Function Tests (LFTs) is unclear. The purpose of this study was to find out the effect of OAGB on LFTS and also if a Bilio-Pancreatic Limb (BPL) of 150 cm (OAGB-150) would deliver better outcomes than that with a BPL of 200 cm (OAGB-200). METHODS: We investigated our prospectively maintained records to obtain information on patients who underwent an OAGB-200 or OAGB-150 until 31st July 2018 in our unit. RESULTS: A total of 405 patients underwent an OAGB-200 (n = 234) or OAGB-150 (n = 171) in our unit between October 2012 -July 2018. There were significant improvements in Gamma-Glutamyl-Transpeptidase (GGT) levels at 1 and 2 years after OAGB-200 and significant worsening in the levels of Alkaline Phosphatase (ALP) and albumin at 1 and 2 years follow up. There was a significant improvement in GGT levels at 1 and 2 years after OAGB-150, and in Alanine Transaminase (ALT) levels at 1 year follow up. There was a significant worsening in ALP and albumin levels at both follow-up points in this group. There was no significant increase in the number of abnormal values for any of the tests in either group at both follow-up points. OAGB-150 group had a significantly lower bilirubin level at 1 year and significantly fewer abnormal ALP values at 2 years in comparison with OAGB-200 patients. CONCLUSION: This study demonstrates the overall safety of OAGB with regards to its effect on LFTs with no remarkable difference between OAGB-150 and OAGB-200.