Cardiac Valve Replacement: Current Status is the proceedings of the Fourth Interna tional Symposium on the ST. JUDE MEDICAL@ valve. The first three symposia on this topic were held primarily for designated investigators involved in clinical trials of the ST. JUDE MEDICAL valve. The last meeting, chaired by Michael E. DeBakey, M.D., was held in November 1982 [1], immediately before the valve was released for general clinical use in the United States...