PMC9194849_01
EEG recording. A. Typical EEG when well. Routine EEG performed before any episodes of status, age 20. Alpha rhythm present at 10-11 Hz. B. Generalized tonic-clonic seizure occurring during a period of status epilepticus. Patient unresponsive. Age 26. Build-up of generalized rhythmic 10 Hz activity with subsequent EMG and movement artefact. C. Nonconvulsive status epilepticus. Patient partially responsive (opened eyes to sound but not closing them on request, moving head when asked but otherwise appeared vacant). Age 27. Repetitive high amplitude generalized sharp waves and spikes seen. D. Encephalopathic post-seizure. Patient partially responsive (turned head in response to name being called but otherwise vacant and unresponsive). Age 26. Diffuse high amplitude theta and delta activity, occasional multifocal sharp waves were noted. E. Also encephalopathic post-seizure. Patient drowsy but responding appropriately. Age 25. Diffuse theta and delta activity. Vertex phenomena also noted. Note differences between panel C and D; patient in an apparently similar clinical state but EEG in C shows continuous repetitive sharp waves/spikes. These are not present in panel D.
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Other typical EEGs showing generalised ictal changes are shown in Fig. 1.