Several prostheses were compared in anastomotic intimal hyperplasia. Composite grafts (inner diameter 4-6mm) with two different prostheses longitudinally were transplanted to a cervical and bilateral femoral arteries in dogs. Anastomotic rings (Tantalum) were fitted up on some of the anastomoses. Variable degree stenosis were observed on the anastomotis of all grafts. Anastomotic intinal hyperplasia was more slight in low porous prosthesis than in high porous prosthesis and in large diameter than in small diameter. The hyperplasia in EPTFE and Double Velour Graft were less marked. Anastomotic ring was effective for blood flow volume and long term patency.
