CPT® Code 37181

The CPT® Code 37181 refers to a surgical procedure known as an open distal splenorenal venous anastomosis, which is performed for the selective decompression of esophagogastric varices. This procedure is a critical intervention aimed at alleviating the complications associated with portal hypertension, particularly the formation of varices in the esophagus and stomach that can lead to life-threatening hemorrhage. The term "splenorenal" indicates that the procedure involves the splenic vein and the left renal vein, creating a connection between these two vessels. The procedure is categorized as "open," meaning it requires a surgical incision to access the abdominal cavity. During the operation, the surgeon employs a left subcostal approach, which allows for optimal access to the spleen and surrounding structures. The procedure involves ligating specific veins, such as the coronary vein and the right gastroepiploic vein, to reduce blood flow to the varices, thereby decreasing the risk of bleeding. The mobilization of the splenic flexure of the colon and retraction of the stomach are necessary steps to expose the pancreas and the splenic vein adequately. The anastomosis itself is performed by connecting the distal portion of the splenic vein to the left renal vein, facilitating the drainage of blood from the esophageal varices through the short gastric vessels into the systemic circulation. This procedure is essential for managing patients with significant portal hypertension and variceal bleeding, providing a means to reduce the pressure in the portal venous system and prevent further complications.