A Roux-en-Y should not be done in the setting of delayed or marginal gastric emptying. The Roux will further delay gastric emptying and revisional surgery will be required (2). If a Roux is indicated in the setting of poor gastric emptying, it should be accompanied with a near total gastrectomy.

Afferent Limb Roux
Fig. 6. Roux-en-Y gastrojejunostomy (note truncal vagotomy and antrectomy). The Roux limb should be 40 cm in length. The afferent limb from the ligament of Treitz to the enteroenterostomy is 15-20 cm.
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