CPT® Code 37181

1. Indications

The procedure described by CPT® Code 37181 is indicated for patients experiencing complications related to portal hypertension, particularly those with esophagogastric varices. The following conditions may warrant the performance of this procedure:

• Esophagogastric Varices: These are dilated veins in the esophagus and stomach that develop due to increased pressure in the portal venous system, often leading to life-threatening bleeding.
• Portal Hypertension: A condition characterized by elevated blood pressure in the portal venous system, which can result from liver cirrhosis, hepatic vein thrombosis, or other liver diseases.
• History of Variceal Bleeding: Patients who have previously experienced bleeding from esophageal varices may require this procedure to prevent recurrence and manage their condition effectively.

2. Procedure

The open distal splenorenal venous anastomosis procedure involves several critical steps to ensure successful decompression of the esophagogastric varices:

• Step 1: The surgeon begins by making a left subcostal incision to access the abdominal cavity. This approach provides adequate exposure to the spleen and surrounding structures.
• Step 2: The coronary vein and right gastroepiploic vein are identified and ligated. This step is crucial as it reduces blood flow to the esophageal varices, thereby decreasing the risk of bleeding.
• Step 3: The splenic flexure of the colon is mobilized to allow for better access to the pancreas and splenic vein. This mobilization is essential for the subsequent steps of the procedure.
• Step 4: The stomach is retracted cephalad to provide a clear view of the inferior aspect of the pancreas. The peritoneum is then incised to expose the splenic vein.
• Step 5: The splenic vein is divided, and the proximal portion is oversewn to prevent blood flow back into the splenic circulation.
• Step 6: The distal portion of the splenic vein is carefully dissected free from the pancreatic bed to prepare for the anastomosis.
• Step 7: The left renal vein is identified and isolated, which is necessary for the anastomosis.
• Step 8: Finally, the end of the distal splenic vein is anastomosed to the side of the left renal vein in an end-to-side configuration. This connection allows for the drainage of blood from the esophageal varices through the short gastric vessels into the systemic circulation, effectively reducing the pressure in the portal venous system.

3. Post-Procedure

After the completion of the open distal splenorenal venous anastomosis, patients typically require careful monitoring in a postoperative setting. Expected recovery includes observation for any signs of complications such as bleeding, infection, or thrombosis at the anastomosis site. Patients may experience some discomfort and will be managed with appropriate pain relief. Follow-up care is essential to assess the effectiveness of the procedure in reducing variceal pressure and preventing further bleeding episodes. Additionally, patients may need ongoing management of their underlying liver condition and regular surveillance for varices.