My mother has been diagnosed with Atrial Fibrillaton, shes been put on...

Atrial fibrillation is a major risk factor of stroke. The top heart chambers (atria) fibrillate and stagnation of blood predisposes to clotting; the blood clot can then get dislodged into circulation and finally wedged in one of the arteries in brain cutting off blood supply and causing a stroke.

Rivaroxaban is one of anticoagulants ('blood thinning' drugs) which reduce the risk of excessive clotting and so the risk of stroke. So, the answer is yes - a previous stroke automatically places your mother in the high risk category - but she seems to be on a good treatment to reduce this risk as much as possible.

In addition to Dr. Ruzicka's answer, anticoagulant treatment does increase the risk of bleeding, including bleeding into the brain which is another cause of stroke. But this risk is much less than the risk of blood clots without anticoagulant so she should continue with it.

Unfortunately there is no zero-risk option with AF but she is now as well protected as possible.

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