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From the Neurology Department (Drs. Lamy, Domigo, Semah, Arquizan, and Mas) and Neuroradiology Department (Dr. Trystram), Sainte-Anne Hospital, Paris; and Department of Biostatistics (Dr. Coste), Cochin Hospital, Paris, France.
Address correspondence and reprint requests to Prof. Jean-Louis Mas, Service de Neurologie, Hôpital Sainte-Anne, 1 rue Cabanis, 75674 Paris Cedex 14, France; e-mail: mas{at}chsa.broca.inserm.fr
Objectives: To assess the incidence and predictive factors of early and late seizures after ischemic stroke in young adults.
Methods: A total of 581 patients (aged 18 to 55 years) with recent cryptogenic ischemic stroke were prospectively enrolled at 30 neurology departments and followed for 37.8 ± 9.7 months. Early seizures (occurring within 7 days of stroke) were assessed by chart review and late seizures were prospectively recorded at each follow-up visit. Clinical and brain imaging findings were reviewed by two neurologists and two neuroradiologists who were blinded to the occurrence of seizures.
Results: Fourteen of the 581 patients (2.4%) developed early seizures, 71% of which occurred within the first 24 hours. Rankin scale 
3 (odds ratio [OR] 3.9, 95% CI 1.2 to 12.7) and cortical involvement (OR 7.7, 95% CI 1.0 to 61.1) were independently associated with early seizures. Late seizures occurred only in patients with hemispheric stroke (n = 20). The risk of first late seizure was 3.1% (95% CI 1.4 to 4.8) within 1 year and 5.5% (95% CI 3.1 to 7.9) within 3 years. The mean delay between stroke and first late seizure was 12.9 months (0.3 to 33.9). Late seizures were associated with early seizure (hazard ratio [HR] 5.1, 95% CI 1.8 to 14.8), cortical signs (HR 4.5, 95% CI 1.6 to 13.1), and size of infarct superior to one-half hemisphere (HR 9.7, 95% CI 3.1 to 30.8). Eleven of the 20 patients with late seizure experienced recurrences (multiple in eight) on antiepileptic drug treatment. Most of them were seizure free at the end of the follow-up.
Conclusion: Epilepsy is rarely a major problem in young cryptogenic ischemic stroke survivors. Early seizures are associated with stroke disability and cortical involvement. Early seizures, cortical signs, and large infarct are independent risk factors for late seizures.
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