title: Refractory epilepsy in a Chinese population.
abstract: OBJECTIVE
  To investigate the proportion of Chinese patients with intractable seizures and the risk factors leading to refractory epilepsy.
  
  
  METHODS
  Consecutive patients over 14 years of age attending a Neurology clinic were evaluated. Patients with epilepsy were classified into two groups according to their seizure control: refractory or seizure-free. Epilepsy was classified as idiopathic as defined by age-related onset and typical electroclinical characteristics, symptomatic if secondary to a structural abnormality and cryptogenic if the cause was unknown. Age, sex, epilepsy syndrome classification, aetiology, presence of mental retardation and the number of drugs used were compared between patients with refractory epilepsy and those in remission.
  
  
  RESULTS
  Among 260 adolescent and adult patients with a mean age of 34 years (range 15-79), complete seizure control was achieved in 157 (60%) cases. Multivariate binomial logistic regression analysis showed that patients with mesial temporal sclerosis (OR=7.6, 95% CI 3.53-16.4, p<0.01) and the presence of mental retardation (OR=9.39, 95% CI 3.98-22.12, p<0.01) were more likely to develop pharmacoresistant epilepsy.
  
  
  CONCLUSIONS
  In adults the underlying aetiology is an important factor as to whether patients develop intractable seizures. Poor control was also associated with the presence of mesial temporal sclerosis and mental retardation.
authors.affiliation: Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China. neurologycare@yahoo.com
authors.forename: Andrew C F
authors.initials: AC
authors.lastname: Hui
authors.forename: Adrian
authors.initials: A
authors.lastname: Wong
authors.forename: H C
authors.initials: HC
authors.lastname: Wong
authors.forename: B L
authors.initials: BL
authors.lastname: Man
authors.forename: K M
authors.initials: KM
authors.lastname: Au-Yeung
authors.forename: K S
authors.initials: KS
authors.lastname: Wong
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000927:Anticonvulsants / Q000627:therapeutic use; D044466:Asian People / Q000706:statistics & numerical data*; D004351:Drug Resistance / Q000208:ethnology; D004827:Epilepsy / Q000188:drug therapy / Q000208:ethnology* / Q000209:etiology; D005260:Female; D006723:Hong Kong; D006801:Humans; D008607:Intellectual Disability / Q000150:complications; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012307:Risk Factors; D012598:Sclerosis / Q000150:complications; D012737:Sex Factors; D013702:Temporal Lobe / Q000473:pathology
chemical_list: D000927:Anticonvulsants