Nonconvulsive status epilepticus (NCSE) in adults represents a constellation of conditions producing ongoing ictal impairment with myriad clinical presentations. These may vary from minimal obtundation, to psychosis to coma for which electroencephalography is essential to diagnosis. Treatment is highly variable and is tailored to the level of consciousness, probable outcome and underlying etiology. There is a new and emerging understanding of the nature of NCSE, its classification and the challenges in treatment. The aim of this article is to review the classic and most recent literature on NCSE in adults focusing attention on the clinical settings in which NCSE frequently occurs, in order to improve awareness of the issues involved in electroclinical diagnosis, treatment and prognostication.
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