NORMAN, Oklahoma, April 2 -- The University of Oklahoma issued the following news release: * * * Clotting Factor Concentrate Better Than Frozen Plasma for Preventing Bleeding After Heart Surgery, According to Clinical Trial Results University of Oklahoma co-led U.S. participation in study OKLAHOMA CITY, OKLA. - Clinical trial results published today in the Journal of the American Medical Association indicate a potential shift in managing bleeding complications after major open-heart surgery.  more