[Vein substitution using PTFE prosthesis--results of animal experiments and initial clinical experiences].

The expanded PTFE prosthesis (Gore Tex), which has been used for 4 years as an artery substitute, was examined in the "low-pressure system" in dogs. In 23 dogs an infrarenal segment of the vena cava was resected and substituted by a Gore Tex prosthesis. In nine dogs an arteriovenous shunt between the right iliac artery and the corresponding vein was also performed. Phlebographic examinations were made 8 days after the operation and at monthly intervals thereafter. After a mean period of 233 days the dogs were killed and histopathologic and electron microscopic analyses performed. Patency was found in 89% of transplants with, and 86% of transplants without, the arteriovenous shunt. Aafter these experiments the Gore Tex prosthesis was implanted successfully in patients suffering from postthrombotic syndrome to serve as a substitute for the superior vena cava and iliac vein. It also acted as a substitute for the jugular vein after neck dissection.