Читать книгу Canine and Feline Epilepsy - Luisa De Risio - Страница 12

Excitability is a key feature of ictogenesis that may originate from individual neurons, neuronal environment or a population of neurons. Excitability arising from single neurons may be caused by alterations in membrane or metabolic properties of individual neurons (Traub et al., 1996). When regulation of environmental, extracellular concentrations of ions or neurotransmitters is suboptimal, the resulting imbalance might enhance neuronal excitation. Collective anatomic or physiologic neuronal alterations may convert neurons into a hyper-excitable neuronal population. In reality, these three theoretical mechanisms are thought to interact during specific ictal episodes. Each epileptic focus is unique as the differential contribution of these three concepts leading to ictal events is thought to differ from focus to focus.