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New Insights into Nonvitamin K Antagonist Oral Anticoagulants' Reversal of Intracerebral Hemorrhage

Masahiro Yasaka
Frontiers of Neurology and Neuroscience 2015, 37: 93-106
26588018
The nonvitamin K antagonist oral anticoagulants (NOACs) dabigatran, rivaroxaban, apixaban, and edoxaban are associated with an equal or lower incidence of stroke and systemic embolism and a much lower incidence of intracranial hemorrhage and hemorrhagic stroke than warfarin is, without the need for routine laboratory monitoring. However, reversal strategies are not currently established in the case of NOAC-related hemorrhagic stroke. In emergency situations, well-defined management for NOAC-related hemorrhagic stroke may improve clinical outcomes. Thus, in this chapter, general measures initially required to prevent the expansion of intracerebral hematomas, charcoal administration to reduce NOAC absorption from the gastrointestinal tract, application of hemodialysis to remove dabigatran, and coagulation factor therapy including 4-factor prothrombin complex concentrate and recombinant activated factor VII are reviewed. The specific reversal agents idarucizumab, which is a monoclonal antibody against dabigatran; andexanet alfa, a recombinant human factor Xa decoy for Xa inhibitors; and PER977, a small synthetic molecule for reversal of both Xa and thrombin inhibitors, are currently under development. These agents will facilitate the clinical management of NOAC-associated hemorrhagic stroke and other severe bleeding.

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