<prompt> To create a porto-caval shunt in a patient with portal hypertension, which of the following venous anastomosis should be performed?Superior mesenteric vein to inferior mesenteric veinRight gastric vein to left gastric veinRight gastric vein to right gastric veinLeft splenic vein to left renal vein  <response>: Portacaval shunting is major surgery. It involves a large cut incision in the belly area abdomen. The surgeon then makes a connection between the portal vein which supplies most of the livers blood and the inferior vena cava the vein that drains blood from most of the lower part of the body.The new connection diverts blood flow way from the liver. This reduces blood pressure in the portal vein and decreases the risk of a tear rupture and bleeding from the veins in the esophagus and stomach. 