A 49-year-old woman had atrial fibrillation that was poorly controlled, even with amiodarone therapy. She suffered a 'stroke' and died. At autopsy, her 600 gm heart is noted to have a mitral valve stenosis along with infective endocarditis. There is an enlarged left atrium filled with mural thrombus. Which of the following underlying causes of death is she most likely to have?
a. Cardiac amyloidosis Coronary b.atherosclerosis
c. Systemic lupus erythematosus
d. Rheumatic heart disease