Timing of Anticoagulation After Acute Ischemic Stroke in Atrial Fibrillation

Introduction to Anticoagulation Timing

The American College of Chest Physicians recommends that anticoagulation should be started within 2 weeks of the acute ischemic stroke, but avoid initiating therapy within the first 48 hours 1, 2, 3

Anticoagulation with heparinoids or warfarin should not be started within 48 hours of stroke onset, as it may increase the risk of symptomatic intracranial hemorrhage without providing net benefit 1, 2, 3
Heparinoids increase the risk of symptomatic intracranial hemorrhage without providing net benefit when used as bridging therapy in the acute phase 1, 2

Oral anticoagulation should usually be started within 2 weeks of acute ischemic stroke, with the exact optimal timing within this 2-week period remaining uncertain 1, 2, 3
Observational data suggest starting anticoagulation between days 4-7 may be reasonable, with one study showing improved outcomes with NOACs started at a median of 4 days post-stroke without early intracranial hemorrhage 2

Direct oral anticoagulants (DOACs) show promise in observational studies when started within the first week post-stroke and are preferred over warfarin for non-valvular atrial fibrillation 1, 2, 3
Long-term oral anticoagulation is strongly recommended as secondary prevention, with the goal of continuing anticoagulation indefinitely based on the patient's CHA₂DS₂-VASc score 1, 2, 3

The American Heart Association and American College of Cardiology recommend choosing apixaban, dabigatran, rivaroxaban, or edoxaban over warfarin for non-valvular atrial fibrillation, although this specific recommendation is not directly cited from these organizations in the provided text, the preference for DOACs over warfarin is consistent with their guidelines 4
Target INR 2.0-3.0 if warfarin is used, although this is based on a citation that also includes an ignored reference 1