For most clinicians, status epilepticus brings to mind a state of ongoing convulsions, often with marked morbidity and mortality. Less well recognized are ongoing epileptic seizures with little or no evidence of convulsion. Such states, often with mild or minimal obtundation, are some of the more difficult conditions to diagnose, especially early in their course. In January, 1888, Charcot in France made a connection between epileptic states and ongoing confusion In 1901, Gowers stated, that after epileptic fits, the patient may pass into a condition of mental automatism, in which various acts are performed in an apparently conscious manner, but of which no recollection is retained afterwards. It was not until the advent of EEG and Lennox's description in 1938 of his cousin who had continuous spike-wave activity that non-convulsive status epilepticus (NCSE) was demonstrated.
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