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Direct Oral Anticoagulants Versus Vitamin K Antagonists in Cerebral Venous Thrombosis: A Systematic Review and
Shadi Yaghi1, Ian J Saldanha2, Chelsea Misquith3
1Department of Neurology, Brown University, Providence, RI (S.Y., B.Z., A.S., K.J., B.P., L.S., E.D.G., K.F.).
Background:
High level evidence for direct oral anticoagulants (DOACs) in patients with cerebral venous thrombosis is lacking. We performed a systematic review and meta-analysis to assess the efficacy and safety of DOACs versus vitamin K antagonists in patients with cerebral venous thrombosis.
Methods:
This systematic review was registered in PROSPERO (CRD42021228800). We searched MEDLINE (via Ovid), EMBASE, CINAHL, and the Web of Science Core Collection between January 1, 2007 and Feb 22, 2022. Search terms included a combination of keywords and controlled vocabulary terms for cerebral venous thrombosis, vitamin K antagonists/warfarin, and DOACs. We included both randomized and nonrandomized studies that compared vitamin K antagonists and DOACs in 5 or more patients with cerebral venous thrombosis. Where studies were sufficiently similar, we performed meta-analyses for efficacy (recurrent venous thromboembolism and complete recanalization) and safety (major hemorrhage) outcomes, using relative risks (RRs).
Results:
Out of 10 665 records identified, we screened 254 as potentially eligible. Nineteen studies (16 observational studies [n=1735] and 3 randomized controlled trials [n=215]) met the inclusion criteria. All 3 randomized controlled trials had some concerns, and all 16 observational studies had at least moderate risk of bias. When compared with vitamin K antagonist treatment, DOAC had comparable risks of recurrent venous thromboembolism (relative risk [RR], 0.85 [95% CI, 0.52-1.37], I2=0%), major hemorrhage (RR, 0.70 [95% CI, 0.40-1.21], I2=0%), intracranial hemorrhage (RR, 0.58 [95% CI, 0.30-1.12]; I2=0%), death (RR, 1.14 [95% CI, 0.54-2.43], I2=1%), and complete venous recanalization (RR, 0.98 [95% CI, 0.87-1.11]; I2=0%).
Conclusions:
This systematic review and meta-analysis suggest that in patients with cerebral venous thrombosis, DOACs, and warfarin may have comparable efficacy and safety. Given the limitations of the studies included (low number of randomized controlled trials, modest total sample size, rare outcome events), our findings should be interpreted with caution pending confirmation by ongoing randomized controlled trials and large, prospective, observational studies.
Insights
Direct oral anticoagulants (DOACs) show comparable efficacy and safety to warfarin for cerebral venous thrombosis patients. Further research is needed to confirm these findings in anticoagulant therapy.
Area of Science:
- Neurology
- Hematology
- Pharmacology
Background:
- High-level evidence for direct oral anticoagulants (DOACs) in cerebral venous thrombosis (CVT) is limited.
- Vitamin K antagonists (VKAs) are a standard treatment, but DOACs offer potential advantages.
Purpose of the Study:
- To systematically review and meta-analyze the efficacy and safety of DOACs compared to VKAs in patients with CVT.
- To assess outcomes including recurrent venous thromboembolism, complete recanalization, and major hemorrhage.
Main Methods:
- Systematic review and meta-analysis of randomized and non-randomized studies.
- Searched multiple databases (MEDLINE, EMBASE, CINAHL, Web of Science) for studies comparing DOACs and VKAs in CVT patients.
- Included 19 studies (3 RCTs, 16 observational studies) with 1950 patients.
Main Results:
- DOACs demonstrated comparable efficacy to VKAs regarding recurrent venous thromboembolism (RR 0.85) and complete venous recanalization (RR 0.98).
- Safety outcomes, including major hemorrhage (RR 0.70) and intracranial hemorrhage (RR 0.58), were also comparable between DOACs and VKAs.
- No significant differences were observed in mortality rates between the two anticoagulant groups.
Conclusions:
- Direct oral anticoagulants (DOACs) and warfarin appear to have comparable efficacy and safety profiles for treating cerebral venous thrombosis.
- Findings should be interpreted cautiously due to limitations, including a low number of RCTs and modest sample sizes.
- Further confirmation from ongoing randomized controlled trials and large prospective studies is warranted.
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