Laparoscopic gastric bypass - general and visceral surgery
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Fashioning the gastric pouch
After starting the operation (Creating the pneumoperitoneum, working trocar placement, exploring the abdominal cavity) expose the angle of His.
Then begin fashioning the gastric pouch at the lesser curvature 2 cm inferior to the gastroesophageal junction. In order to avoid bleeding complications and assure blood flow to the pouch, spare the left gastric artery which will supply the gastric pouch. Begin dividing the stomach in a horizontal direction with a linear stapler (staple height 3.5 mm).
Continue the dissection in triangular fashion toward the left crus of diaphragm. It serves as an anatomical landmark.
Transect the entire gastric fundus to bypass the production site of the enterohormone ghrelin from the intestinal transit and prevent subsequent dilation.
Finally, ensure adequate ultrasound hemostasis at the staple line.
Measuring the biliodigestive limb and bringing it up into the upper abdomen
After completely dividing the stomach, expose the ligament of Treitz. Divide the greater omentum if very fat. About 50 cm distad to the ligament of Treitz, bring the jejunal limb antecolically to the gastric pouch. When measuring it is helpful to always keep the efferent limb on the right on the monitor screen with the instrument of the right hand to avoid misidentification of the limbs. The use of measuring tools is helpful.
Alternative routes to the gastric pouch for the efferent limb.
Tip: To avoid fashioning a limb that is too short, first check that the efferent limb is long enough to reach the pouch. If the limb proves to be too short nevertheless, it is recommended to fashion a primary gastric sleeve-like pouch and/or skeletonize the efferent limb or bring the limb up via a retrocolic retrogastric route.
Parallel anchoring of the limb on the gastric pouch
Anchor the jejunal limb tension-free on the gastric pouch with two sutures.
Note: If the limb is anchored too far craniad, this will result create a distal pouch reservoir with overflow phenomenon; if the limb is anchored too far caudad, this will increase the risk of a dumping syndrome. The limb should therefore be placed at the second staple line and tailored to the shape and size of the pouch.
Tip: To avoid a twisted limb (“blue limb” syndrome), bring up the limb under direct vision (with the mesentery pointing to the left). Correct and eliminate any limb rotation.
Limb misidentification must be ruled out at all cost and this requires consistent identification of the ligament of Treitz. Any misidentification of the limbs must be corrected immediately since otherwise the overstretched stomach (distension) carries the risk of cardiac arrest.
Fashioning the antecolic retrogastric gastroenterostomy (linear anastomosis of the posterior wall)
Fashioning the gastroenterostomy (suture closure of the anterior wall)
Inspecting the anastomosis
Transecting the small intestine / dividing the afferent limb
Anchoring suture at the biliodigestive stump/measuring the efferent limb
Fashioning the enteroenterostomy I
Fashioning the enteroenterostomy II
Closing the Petersen space
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