Scope and Contents 1 "Aortic grafts with rough surfaces are covered with fibrin and stay patent. For valves use knitted Teflon."

2 "All of the right atrial patches were covered with thrombi. Thrombi were the most extensive 5-9 days after the operation; the largest were on the suture lines."

3 "Atrioventricular patches were free of thrombi when they had smooth surfaces." Three minutes.