Febrile seizures are generalized seizures, typically in children between the ages of 6 months and 5 years, that occur with a fever >100.4 °F (38 °C) not associated with a central nervous system (CNS) infection, a known seizure-provoking etiology (eg, electrolyte imbalance, hypoglycemia, or substance abuse), or history of an afebrile seizure. Febrile seizures are categorized as simple febrile seizures, consisting of a single seizure, only <15 min long, or complex febrile seizures, characterized by multiple seizures occurring within 24 hours, focal neurologic features, or a seizure lasting ≥15 min. Simple febrile seizures comprise the majority of febrile seizures.
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