Initiation of VTE Prophylaxis and Therapeutic Anticoagulation in Atrial Fibrillation Patients with Acute Ischemic Stroke

VTE Prophylaxis

The American Heart Association recommends VTE prophylaxis with subcutaneous anticoagulation (LMWH, fondaparinux, or low-dose unfractionated heparin) to prevent deep vein thrombosis in immobile stroke patients, which can be started early 1, 2
Intermittent pneumatic compression is recommended as it reduces VTE risk and possibly death 2
Routine antiembolic stockings are not recommended 2

The American College of Chest Physicians recommends that therapeutic anticoagulation with DOACs or vitamin K antagonists should not be started within 48 hours of acute ischemic stroke due to increased risk of symptomatic intracranial hemorrhage without net benefit 3
Heparinoids or bridging therapy should not be used in the acute stroke phase, as they increase symptomatic intracranial hemorrhage risk without reducing recurrent ischemic events 3

For transient ischemic attack, DOAC can be started 1 day after the event after ruling out intracranial hemorrhage with imaging 4
For mild stroke, DOAC can be started after 3 days, with repeat brain imaging at day 6 to evaluate for hemorrhagic transformation before initiating anticoagulation 4
For moderate stroke, DOAC can be started after 6-8 days, with repeat brain imaging at day 6 to assess for hemorrhagic transformation 4
For severe stroke, DOAC can be started after 12-14 days, with repeat brain imaging at day 12 to exclude hemorrhagic transformation 4

DOACs are strongly preferred over vitamin K antagonists for secondary stroke prevention in atrial fibrillation patients, as they reduce intracranial hemorrhage risk by approximately 56% compared to warfarin 4

Before initiating therapeutic anticoagulation, brain imaging (CT or MRI) should be obtained to exclude hemorrhage, and repeat imaging is mandatory for moderate-to-severe strokes to detect hemorrhagic transformation before starting anticoagulation 4

Aspirin 160-325 mg daily should be given within 48 hours of stroke onset to reduce stroke mortality and morbidity, provided the patient has not received or will not receive thrombolytic therapy 1
Early mobilization within 24 hours is safe and feasible for neurologically and hemodynamically stable patients 2