Initial Treatment for Venous Sinus Thrombosis

Diagnostic Confirmation

Diagnosis should be confirmed with appropriate imaging, preferably MRI with MR venography, or CT venography if MRI is not readily available 1
Catheter angiography may be needed in select cases with high clinical suspicion but negative initial imaging 1

The American College of Chest Physicians recommends low-molecular-weight heparin (LMWH) as the preferred initial treatment option due to its superior efficacy compared to unfractionated heparin for DVT treatment 2
LMWH has fixed dosing based on weight without need for routine monitoring, and can be administered once-daily or twice-daily 3, 4, 5
Intravenous unfractionated heparin (UFH) is an appropriate alternative when LMWH is contraindicated or unavailable, or in cases of severe renal failure or potential need for thrombolytic therapy 3, 4, 5, 6

The recommended dosing for LMWH is 1.0 mg/kg twice daily or 1.5 mg/kg once daily for enoxaparin, and 200 U/kg once daily for dalteparin 5
The recommended dosing for UFH is an initial bolus of 5000 IU, followed by continuous infusion of approximately 30,000 IU over 24 hours, adjusted to maintain aPTT at 1.5-2.5 times the baseline value 5

Early initiation of oral anticoagulants is recommended, with continuation of parenteral anticoagulation for a minimum of 5 days and until INR is ≥2.0 for at least 24 hours 4, 6
The duration of anticoagulation depends on underlying etiology, with 3-6 months for transient risk factors and indefinite anticoagulation for severe thrombophilia or recurrent thrombosis 1

Regular neurological assessment is necessary to detect clinical deterioration 1
Investigation of underlying prothrombotic conditions is important, as this affects treatment duration 1

Delaying anticoagulation due to presence of hemorrhagic lesions is not recommended, as this is not a contraindication 1
Failing to recognize clinical deterioration can occur in some patients despite appropriate treatment 1
Inadequate duration of anticoagulation based on underlying risk factors should be avoided 1