Pathophysiology
Clinical meaning
Febrile seizures arise from the convergence of age-dependent neuronal hyperexcitability and systemic inflammatory response. The immature brain exhibits enhanced excitatory amino acid (glutamate, aspartate) neurotransmission, reduced GABAergic inhibition, and incomplete axonal myelination, creating a low seizure threshold. Pyrogens (IL-1β, IL-6, TNF-α, PGE2) act on hypothalamic thermoregulatory centers to reset the temperature set-point while simultaneously enhancing neuronal excitability through direct effects on ion channel kinetics—accelerating sodium channel recovery and reducing potassium conductance. Genetic susceptibility loci (FEB1-FEB8) influence channelopathy variants, particularly SCN1A and GABRG2 mutations, which overlap with genetic epilepsy syndromes. The clinician must conduct differential diagnosis, order and interpret diagnostic workup, prescribe treatment, determine need for neuroimaging or EEG, and manage long-term seizure recurrence planning.