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Risk factors for status epilepticus in children with symptomatic epilepsy

From the Division of Neurology, Schneider Children's Hospital, New Hyde Park, NY.

Address correspondence and reprint requests to Dr. Gerald Novak, Room 267, Division of Neurology, Schneider Children's Hospital, New Hyde Park, NY 11040.

The purpose of this study was to determine risk factors for status epilepticus (SE) in children with symptomatic epilepsy through a retrospective case-control study. Patients (44 children with a prior diagnosis of symptomatic epilepsy experiencing one or more episodes of SE between January 1, 1991, and June 1, 1995) were matched for age at follow-up to controls (88 children with symptomatic epilepsy without SE during that interval) and medical records were reviewed. Patients and controls did not differ in etiology or in age at epilepsy onset (1 year 5 months [SD, 2 years 3 months] versus 1 year 3 months [SD, 1 year 5 months]). Univariate analysis revealed significant associations between SE and several factors, including history of a first seizure as SE, partial epilepsy, partial seizures with secondary generalization, focal paroxysmal abnormalities and focal background abnormalities on EEG, and generalized abnormalities on neuroimaging. Groups did not differ in the proportion of patients on polypharmacy or with subtherapeutic serum antiepileptic drug levels, but there was a trend for greater used of phenobarbital in patients (57% versus 38%, odds ratio (OR) = 2.6, p = 0.057). With multiple logistic regression, four factors emerged as independent predictors of SE risk: focal background EEG abnormalities (OR = 6.51, p = 0.0005), partial seizures with secondary generalization (OR = 4.61, p = 0.0021), first seizure as SE (OR = 3.99, p = 0.034), and generalized abnormalities on neuroimaging (OR = 2.85, p = 0.034). These four factors are indicators of a higher risk of SE in children with symptomatic epilepsy.

Received October 23, 1996. Accepted in final form February 4, 1997.

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