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The mean ΔPSV and the mean %ΔPSV were higher in LSG patients "group A" (- 0.84 cm/s and 3.25% respectively) compared with LOAGB patients "group B"(- 0.06 cm/s and 0.27% respectively); P = 0.038 and 0.039 respectively. The mean change in PSV was in the negative direction in both groups, i.e., "deceleration." No cases of PVT were reported in the study. Laparoscopic sleeve gastrectomy is associated with greater reduction in portal venous peak systolic flow velocity in the early postoperative period, compared with laparoscopic one-anastomosis