[Pathophysiology of epileptic seizures and status epilepticus].
Primary and secondary epileptogenesis involves multiple genetic and acquired factors. Epileptogenesis is a complex result of combined factors including membrane factors, neurotransmitter and environmental factors. Ion channel-related diseases, GABA and glutamate dysfunction, and glial reaction intervene in different epileptic conditions. The understanding of the mechanisms which emphasize initiation and maintenance of status epilepticus (SE) are in progress. Prognosis of SE is related to the duration of epileptic activity and to the acute cerebral and systemic consequences. Delayed cellular and molecular alterations after SE are responsible for secondary epileptogenesis. Glutamate receptor activation is the main key point leading to an excessive intraneuronal accumulation of ionic calcium by which a cascade of reactions is induced. Apoptotic neuronal death, glial reaction axonal sprouting and neurogenesis contribute to a state of hyperexcitability and hypersynchrony. A better understanding of underlying mechanisms of epileptogenesis may serve the development of new drugs with both anticonvulsant and antiepileptic (prevention or neuroprotection) actions.
Service explorations neurologiques et épileptologie, hôpital Gui-de-Chauliac, 34295 Montpellier, France. m-baldy_moulinier@chu-montpellier.fr
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D006801:Humans; D012640:Seizures / Q000209:etiology / Q000378:metabolism / Q000503:physiopathology*; D013226:Status Epilepticus / Q000209:etiology / Q000378:metabolism / Q000503:physiopathology*