Question: The use of anticoagulation is clearly effective in preventing recurrent cardioembolic strokes from atrial fibrillation, a recent myocardial infarction, valvular disease, or a patent foramen ovale. Contraindications to the use of anticoagulation include which of the following? Question options: 1) Hemorrhage on CT scan 2) Large cerebral infarctions 3) Evidence of bacterial endocarditis 4) a and b 5) all of the above