Four dogs with single extrahepatic portosystemic shunt underwent the surgery of occlusion of the shunt vessel using ameroid constrictors. Before and after the surgery, changes in postprandial serum bile acid and ammonium concentrations were evaluated. In addition, the shunt flow volume was measured on ultrasonography in one of 4 cases. The shunt flow volume was rapidly decreased 3 days after the surgery, among which one case developed multiple shunt formation demonstrated radiographically on day 90 after the surgery. From these results, occlusion of the shunt vessel by ameroid constrictors may cause serious postsurgical portal hypertension, therefore further researches will be needed to clarify how to select the suitable patient with portosystemic shunt to apply ameroid constrictors to occlude the shunt vessel.
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