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題 名 | 代謝性腦病變的腦波表現=EEG Manifestations in Metabolic Encephalopathy |
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作 者 | 林宙晴; | 書刊名 | Acta Neurologica Taiwanica |
卷 期 | 14:3 民94.09 |
頁 次 | 頁151-161 |
分類號 | 415.835 |
關鍵詞 | 代謝性腦病變; 腦波圖; Metabolic encephalopathy; EEG; |
語 文 | 中文(Chinese) |
英文摘要 | Normal brain function depends on normal neuronal metabolism, which is closely related to systemic homeostasis of metabolites, such as glucose, electrolytes, amino acids and ammonia. "Metabolic encephalopathy" indicates diffuse brain dysfunction caused by various systemic derangements. Electroencephalogram (EEG) is widely used to evaluate metabolic encephalopathy since 1937, when Berger first observed slow brain activity induced by hypoglycemia. EEG is most useful in differentiating organic from psychiatric conditions, identifying epileptogenicity, and providing information about the degree of cortical or subcortical dysfunction. In metabolic encephalopathy, BEG evolution generally correlates well with the severity of encephalopathy. However, BEG has little specificity in differentiating etiologies in metabolic encephalopathy. For example, though triphasic waves are most frequently mentioned in hepatic encephalopathy, they can also be seen in uremic encephalopathy, or even in aged psychiatric patients treated with lithium. Spike-and-waves may appear in hyper- or hypo-glycemia, uremic encephalopathy, or vitamin deficiencies, etc. Common principles of EEG changes in metabolic encephalopathy are (1) varied degrees of slowing, (2) assorted mixtures of epileptic discharge, (3) high incidence of triphasic waves, and (4), as a rule, reversibility after treatment of underlying causes. There are some exceptions to the above descriptions in specific metabolic disorders and EEG manifestations are highly individualized. |
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