Late seizures in cerebral venous thrombosis

Objective: To examine the incidence, characteristics, treatment, and predictors of late seizures (LS) after cerebral venous thrombosis (CVT), we described these features in a registry of 1,127 patients with CVT. Methods: We included consecutive adult patients from an international consortium of twelve hospital-based CVT registries. We excluded patients with a history of epilepsy or with 7 days after diagnosis of CVT. We used multivariable Cox regression to identify predictors of LS. Results: We included 1,127 patients with CVT. During a median follow-up of 2.0 years (interquartile range [IQR] 1.0-6.3), 123 patients (11%) experienced one or more LS (incidence rate for first LS 30 per 1,000 person-years, 95%CI 25-35). Median time to first LS was 5 months (IQR 1-16). Baseline predictors of LS included status epilepticus in the acute phase (Hazard Ratio [HR] 7.0, 95%CI 3.9-12.6), acute seizure(s) without status epilepticus (HR 4.1, 95%CI 2.5-6.5), intracerebral hemorrhage (HR 1.9, 95%CI 1.1-3.1), subdural hematoma (HR 2.3, 95%CI 1.1-4.9) and decompressive hemicraniectomy (HR 4.2, 95%CI 2.4-7.3). Eighty-five patients (70% of patients with LS) experienced a recurrent seizure during follow-up, despite the fact that 94% received anti-epileptic drug treatment after the first LS. Conclusion: During a median follow-up of two years, approximately one in ten patients with CVT had LS. Patients with baseline intracranial bleeding, acute symptomatic seizures, and those who underwent decompressive hemicraniectomy were at increased risk of developing LS. The high recurrence risk of LS justifies epilepsy diagnosis after a first LS.