Clinical question: Is rivaroxaban as effective and safe as warfarin immediately following minor acute ischemic stroke from atrial fibrillation?
Background: There is uncertainty regarding the best approach to anticoagulation acutely after ischemic stroke secondary to atrial fibrillation. To reduce the risk of intracranial hemorrhage, many physicians start aspirin immediately and delay initiating warfarin until days to weeks later. With their more predictable and rapid anticoagulant effect with potentially lower risk of intracranial hemorrhage, direct oral anticoagulants such as rivaroxaban are an attractive possible alternative to warfarin in the acute setting.
Study design: Multicenter, randomized, open-label superiority trial with blinded outcome assessment.
Setting: Fourteen academic hospitals in South Korea.
Synopsis: One hundred eighty-three patients with mild acute (within 5 days) ischemic stroke secondary to nonvalvular atrial fibrillation were randomized to immediately initiate either rivaroxaban or warfarin. The primary outcome (composite of new ischemic lesion or new intracranial hemorrhage on MRI at 4 weeks) occurred at similar frequency between groups (49.5% versus 54.5%, P = .49). Rates of adverse events were comparable in each group. Median hospitalization length was shorter in those randomized to rivaroxaban (4.0 versus 6.0 days, P less than .001). Limitations include a radiographic primary outcome that captured many asymptomatic lesions, homogenous study population, and lack of a delayed anticoagulation group.
Bottom line: In patients with mild acute stroke from nonvalvular atrial fibrillation, rivaroxaban and warfarin demonstrated comparable efficacy and safety. More study is needed to determine the optimal anticoagulation strategy in acute stroke.
Citation: Hong K-S et al. Rivaroxaban vs. warfarin sodium in the ultra-early period after atrial fibrillation-related mild ischemic stroke: A randomized clinical trial. JAMA Neurol. 2017; 74(10):1206-15.
Dr. Kanjee is a hospitalist, Beth Israel Deaconess Medical Center, and instructor in medicine, Harvard Medical School, Boston.
