Provides guidance for anticoagulation of patient with atrial fibrillation
Age >=75 1
Prior stroke 2
0 Low risk Treat with aspirin*
1-2 Intermediate risk Aspirin or Warfarin
>2 High risk Treat with warfarin
*Lone atrial fibrillation is atrial fibrillation in the absence of other risk factors for stroke. Aspirin is the only antithrombotic therapy required for patient with lone atrial fibrillation. If a patient with lone atrial fibrillation is asymptomatic and has no tachycardia, then aspirin is all the patient needs. Rate control is unnecessary.