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SUMMARYGastric emptying of solids and liquids was measured in 12 dogs with and without corporal or antral gastrojejunostomy. Both types of stoma hastened the onset but did not alter the time from onset to complete emptying of 40 small plastic spheres. Corporal gastrojejunostomy slowed the emptying of 400ml. of 1 5 4 m~ NaCl but not of 500 mM glucose, whereas antral gastrojejunostomy slowed the emptying of both.GASTRO-ENTEROSTOMY has been used by surgeons to alter gastric emptying for almost IOO years (Wolfler [1881(Wolfler [ ], 1962. The assumption often made is that the operation speeds the discharge of gastric content from the stomach. However, no quantitative assessment of gastric emptying of solids and liquids after gastro-enterostomy has been done.We tested the effect of corporal and antral gastrojejunostomy on gastric emptying of solid spheres and liquids in conscious dogs and found that the rate of emptying was not increased. In fact, gastric emptying of iso-osmolar NaCl was slowed. MATERIALS AND METHODSTwelve mongrel female dogs, weighing 8-15 kg., were divided into two groups. Four dogs underwent immediate gastrojejunostomy under sodium pentobarbital anaesthesia using sterile technique, and 8 were not operated on. The stomach and jejunum were exposed through a ventral midline upper abdominal incision. In dogs I and 2 a longitudinal gastrotomy was made through the anterior wall of the stomach parallel to the greater curvature and I cm. from it; the incision began 16 cm. orad to the gastroduodenal junction and extended aborad 4 cm. A longitudinal jejunotomy was next made through the antimesenteric border of the proximal jejunum; the incision began 15 cm. distal to the ligament of Treitz and extended aborad 4 cm. An antecolic anastomosis was then performed between the stomach and the jejunum at the enterotomy sites using a single layer of non-inverting, interrupted, ooo Dacron sutures. The stomach and jejunum were joined so that the orad limits of the gastrotomy and jejunotomy were apposed, as were the aborad limits. Thus, an isoperistaltic, antecolic, anterior, corporal gastrojejunostomy resulted, with a circumference of 8 cm. and a diameter of about 2.5 cm. The most distal limit of the anastomosis was 12 cm. from the