four of the six mitral xenografts associated with thromboembolism were in the 16 patients who had atrial fibrillation and received aspirin and dipyridamole but no warfarin ( 12 % per patient-year ) , and two were in the 14 patients who were in sinus rhythm and were not taking medication , one of whom had recurrent candida endocarditis .
C0004238
atrial fibrillation
C0043031
warfarin