When comparing apixaban with warfarin , patients who received amiodarone had a stroke or a systemic embolism rate of @ % / year versus @ % / year ( HR : @ , @ % CI : @ to @ ) , death of @ % / year versus @ % / year ( HR : @ , @ % CI : @ to @ ) , and major bleeding of @ % / year versus @ % / year ( HR : @ , @ % CI : @ to @ ) .