title: Baclofen for patients with congenital periodic alternating nystagmus.
abstract: OBJECTIVE
  To describe the clinical effect of baclofen on a group of patients with congenital periodic alternating nystagmus.
  
  
  METHODS
  A retrospective review of case notes was carried out of all patients with congenital periodic alternating nystagmus (PAN) treated with baclofen between 1999 and 2004. Eight patients were identified, 6 males and 2 females with a mean age of 21 years (range 9 to 34 years). Clinical data were recorded for all patients pre- and post-treatment with the GABA agonist baclofen. Adverse effects of the treatment were recorded and a questionnaire was constructed to evaluate patient satisfaction with the treatment.
  
  
  RESULTS
  All 8 patients had an abnormal head posture (AHP) before treatment which improved following treatment in 4 patients, one of whom had recurrence following treatment withdrawal. Binocular Snellen visual acuity (VA) improved by one line in 4 cases, while none of the other 4 patients suffered any loss of vision from the treatment. Three of the eight patients have continued on treatment long-term, in one case for 6 years. In the other five, treatment was withdrawn due to side effects in 4 cases, and in the fifth due to a lack of effect. The most commonly reported side effect was drowsiness, which occurred in 3 patients. Using a patient-centered survey, complete responses were obtained from 6 of the 8 patients treated. Five patients were either pleased or very pleased that they had tried the treatment. The reasons given were: improved vision or head posture, an appreciation of slowing of ocular movements, improved cosmesis and improved confidence.
  
  
  CONCLUSIONS
  Baclofen may be effective in a select group of patients with congenital PAN and a trial of treatment may be worthwhile, prior to considering surgical intervention in this condition.
authors.affiliation: Department of Paediatric Ophthalmology and Strabismus, Moorfields Eye Hospital, London, UK.
authors.forename: R M
authors.initials: RM
authors.lastname: Comer
authors.forename: E L M
authors.initials: EL
authors.lastname: Dawson
authors.forename: J P
authors.initials: JP
authors.lastname: Lee
mesh_terms: D000293:Adolescent; D000328:Adult; D001418:Baclofen / Q000009:adverse effects / Q000627:therapeutic use*; D002648:Child; D005260:Female; D018755:GABA Agonists / Q000009:adverse effects / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D020417:Nystagmus, Congenital / Q000188:drug therapy*; D017060:Patient Satisfaction; D012189:Retrospective Studies; D015348:Vision, Binocular
chemical_list: D018755:GABA Agonists; D001418:Baclofen