The 10 - year Warfarin and Aspirin for Reduced Cardiac Ejection Fraction (WARCEF) trial is the largest randomized, double - blind comparison of aspirin and warfarin (also known by its brand name Coumadin) for heart failure, following 2,305 heart failure patients whose heart muscle pumps
less oxygen -
rich blood into the body, known as reduced ejection fraction, at 168 study sites in 11 countries on three continents.