Step 8: Recovering gastrointestinal circulation following the Roux-en-Y procedure using functional end-to-end anastomosis without previous resection of esophagus and jejunum: Exposing the loop jejunum at a distance of 60 cm from the Treitz angle, examining whether the artery was enough long and able to supply sufficient blood. Releasing the mesentery 3 cm at the mesenteric border and opening a small hole 1 cm at the free border of the jejunum.