Two patients with previous distal splenorenal shunts (DSRSs) performed 6 years earlier underwent liver transplantation (LT). A preoperative selective mesenteric artery angiogram showed collateral veins draining mesenteric venous flow into the shunt. Intraoperative flow measurements were performed to assess the steal of portal venous flow by the shunt and determine the need for shunt occlusion. Portal vein, hepatic artery, and shunt flows were measured by ultrasound transit-time flow probes in the native liver and after graft implantation with and without temporary shunt occlusion. Hemodynamic studies showed that long-standing DSRSs are high-flow shunts that steal portal flow. After graft implantation, DSRS flows remained high. Occlusion of the shunts produced an increase in portal vein flow at an amount similar to those of splenorenal shunt. Thus, the flow measurements showed persistent steal by the shunts after graft implantation and, therefore, the DSRSs were occluded but splenectomy was not performed. We conclude that the decision to occlude a DSRS should be based on the demonstration of steal of portal flow by the shunt and reversibility once the shunt is occluded. Splenectomy is not required when the DSRS is occluded.
Copyright 1999 by the American Association for the Study of Liver DiseasesA distal splenorenal shunt (DSRS) 1 is used to treat recurrent bleeding from gastroesophageal varices in patients with good liver function after failure of sclerotherapy and pharmacological treatments. 2 The purpose of this shunt is to selectively decompress the variceal territory while portal perfusion to the liver is maintained, thus preventing encephalopathy and liver failure. 3,4 However, collateral veins gradually develop over time, producing a decrease in portal perfusion by leakage from the high-pressure mesenteric bed into the decompressed gastrosplenic bed, thereby converting the DSRS into a central or nonselective shunt. [5][6][7] Optimal portal venous flow is essential for successful liver grafting. Therefore, central portosystemic shunts should be closed after graft implantation to avoid diversion of portal flow from the graft. As far as a DSRS is concerned, controversy exists as to whether shunt occlusion is warranted.We present the intraoperative flow measurements performed in 2 patients with distal DSRSs during liver transplantation (LT) that permitted us to measure the steal of portal flow by the shunt and decide on the need for shunt occlusion.
Case ReportsA 64-year-old woman and a 34-year-old man, both with hepatitis C viral cirrhosis and hepatocellular carcinoma, underwent LT. In both cases, a DSRS had been performed 75 months earlier and liver function was well preserved. The tumors were confirmed by fine-needle aspiration cytology. Selective celiac and mesenteric angiography were performed, followed by selective arterial chemoembolization with lipiodol, doxorubicin, and gelfoam. These angiographies showed a patent DSRS (Fig 1). The portal vein was patent, but with poor perfusion. Collateral pancreati...