12. Autonomic epileptic seizures (original) (raw)

Clinical Neurophysiology, 2011

Abstract

abnormality in hemisphere, with acute onset or a progressive course, but could be transient. The most important pattern is polymorphic delta activity. Generalized asynchronous slow waves occur over both hemispheres without constant time relationship. They usually have irregular shapes and vary in frequency and could be reduced by eye opening and alerting. A marked amount of these slow waves always indicates a widespread cerebral abnormality. Bilaterally synchronous slow waves appear at the same time in corresponding areas of the left and right hemispheres, usually as intermittent trains of slow waves. They are reduced by eye opening or alerting, and increased by hyperventilation and drowsiness. Frequently, they occur as the characteristics pattern known as frontal (FIRDA), temporal (TIRDA) or occipital (OIRDA) intermittent rhythmical delta activity. Bisynchronous slow waves are abnormal in alert resting adults, where they result from an abnormality projecting from distant, subcortical structures, such as diffuse encephalopathy, structural lesions of thalamocortical and interhemispheric interactions.

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