<prompt> Lennox Gastaut syndrome is characterized by:Single seizures typeOccurs in adultsGood prognosis with adequate controlEEG showing less than 2.5 Hz spike and wave discharge  <response>: Lennox-Gastaut syndrome Occurs in children. Multiple seizure types: i GTCS ii Atypical absence iii Atonic seizure Etiology multifactorial EEG 2.5 Hz spike slow wave D.O.C Na valproate Is associated with CNS disease or dysfunction from a variety of causes, including de novo mutations, developing abnormalities, perinatal hypoxia ischemia. Has poor prognosis due to underlying CNS disease. 