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Endovascular thrombolysis, with or without mechanical clot removal, may be beneficial for a subgroup of patients with cerebral venous sinus thrombosis (CVT) who have a poor prognosis despite treatment with heparin. Published experience with endovascular thrombolysis is promising but only based on case series and not on controlled trials.

The objective of the Thrombolysis or Anticoagulation for Cerebral Venous Thrombosis (TO-ACT) trial is to determine if endovascular thrombolysis improves the functional outcome of patients with a severe form of CVT.

The TO-ACT trial is a multicenter, prospective, randomized, open-label, blinded endpoint trial. Patients are eligible if they have a radiologically proven CVT, a high probability of poor outcome (defined by presence of one or more of the following risk factors: mental status disorder, coma, intracranial hemorrhagic lesion, or thrombosis of the …