Boulenouar Mesraoua - MD, FAAN Associate Professor of Neurology, Hamad Hospital and Weill Cornell Medical College, Qatar.

Prolonged nonconvulsive seizures have been described at least since the ۱۹th century, although their recognition in the Status Epilepticus category was not made until ۱۹۶۲. Since then, several epidemiological studies of NCSE have been undertaken, with different results ; It is difficult to accurately estimate the prevalence of NCSE; the prevalence of NCSE depends on the definition used; two recent interesting dates in the history of the NCSE have opened a new era for NCSE epidemiological studies; in ۲۰۱۳, following an extensive review of abnormal EEG epileptiform discharges ,the Salzburg Consensus Statement proposed working diagnostic criteria for NCSE and highlighted the use of unified EEG terminology.Additionally, in ۲۰۱۵, the International League Against Epilepsy highlighted the importance of operational timelines for the early detection and treatment of status epilepticus, particularly NCSE.Recognition of NCSE can be particularly challenging, as a wide range of differential diagnoses in different populations must be considered.This presentation will highlight the evolution of epidemiological research regarding NCSE before and after the periods ۲۰۱۳-۲۰۱۵