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Febrile seizures are convulsions that occur in children between 6 months and 5 years of age during febrile episodes, typically when body temperature rises rapidly above 38°C (100.4°F). They are the most common type of seizure in childhood, affecting 2-5% of children, and are generally benign with excellent long-term prognosis.
The exact mechanism involves the immature developing brain's increased susceptibility to temperature-induced neuronal hyperexcitability and altered neurotransmitter balance during fever. Rapid temperature elevation, rather than the absolute temperature reached, appears to be the primary trigger, with genetic predisposition playing a significant role in seizure threshold sensitivity.
Simple febrile seizures (generalized, lasting <15 minutes, no recurrence in 24 hours) require supportive care and fever management, while complex febrile seizures warrant further neurological evaluation to rule out CNS infections or underlying epilepsy. The key clinical decision involves distinguishing between benign febrile seizures and more serious conditions like meningitis, particularly in children under 12 months or those with complex seizure features.
Key imaging focus: CT for acute (hemorrhage, mass); MRI epilepsy protocol for structural causes