title: Presence of epileptiform discharges on initial EEGs are associated with failure of retention on first antiepileptic drug in newly diagnosed cryptogenic partial epilepsy: a 2-year observational study.
abstract: OBJECTIVE
  Approximately two-thirds of the patients with newly diagnosed partial epilepsy remained on their first antiepileptic drug (AED) for 2 years in clinical practice. We aimed to analyze retention on the first AED for 2 years in newly diagnosed cryptogenic partial epilepsy patients in clinical practice and whether the presence of epileptiform discharges on the initial EEG was a predictor of the failure of retention on the first AED.
  
  
  METHODS
  For the purpose of this study, we retrospectively reviewed epilepsy database. On the Epilepsy Database, we found 495 newly diagnosed epilepsy patients who had been followed up for at least 2 years. Of these 495 newly diagnosed epilepsy patients, 172 patients had cryptogenic partial epilepsy. The outcome of this study was the retention rate for the first AED for 2 years. In addition, we analyzed the retention on first AED according to the presence or absence of epileptiform discharges on the initial EEG using Kaplan-Meier survival analysis.
  
  
  RESULTS
  Overall, retention rate on the first AED for 2 years was 51%. The main lesion of retention failure was a lack of tolerance. The presence of epileptiform discharges on the initial EEGs was significantly related to the failure of retention on the first AED (p=0.003).
  
  
  CONCLUSIONS
  In newly diagnosed cryptogenic partial epilepsy, overall retention on the first AED was not significantly different from that in newly diagnosed partial epilepsy. In clinical practice, epileptiform discharges on the initial EEG could predict the failure of retention on the first AED for 2 years.
authors: Department of Neurology, Haeundae Paik Hospital, Inje University, Republic of Korea. epidoc@inje.ac.kr
authors: Sung Eun
authors: SE
authors: Kim
authors: Kang Min
authors: KM
authors: Park
authors: Sang Ho
authors: SH
authors: Kim
authors: Oh Young
authors: OY
authors: Kwon
authors: Soon Ki
authors: SK
authors: No
mesh_terms: D000293:Adolescent; D000328:Adult; D000927:Anticonvulsants / Q000627:therapeutic use*; D001921:Brain / Q000187:drug effects / Q000503:physiopathology; D002220:Carbamazepine / Q000031:analogs & derivatives / Q000627:therapeutic use; D004569:Electroencephalography / Q000187:drug effects; D017029:Epilepsy, Complex Partial / Q000188:drug therapy* / Q000503:physiopathology; D005260:Female; D005632:Fructose / Q000031:analogs & derivatives / Q000627:therapeutic use; D006801:Humans; D053208:Kaplan-Meier Estimate; D000077213:Lamotrigine; D008297:Male; D008875:Middle Aged; D010672:Phenytoin / Q000627:therapeutic use; D012189:Retrospective Studies; D000077236:Topiramate; D016896:Treatment Outcome; D014227:Triazines / Q000627:therapeutic use; D014635:Valproic Acid / Q000627:therapeutic use; D055815:Young Adult
chemical_list: D000927:Anticonvulsants; D014227:Triazines; C476610:oxcarbamazepine; D000077236:Topiramate; D005632:Fructose; D002220:Carbamazepine; D014635:Valproic Acid; D010672:Phenytoin; D000077213:Lamotrigine