title: Familial occurrence of complex regional pain syndrome.
abstract: BACKGROUND
  The etiology of complex regional pain syndrome (CRPS) is unknown. Different environmental and genetic factors have been postulated to contribute to CRPS.
  
  
  METHODS
  We reviewed the clinical data from a cohort of 69 patients with CRPS. Four families were identified with two or more members affected with CRPS yielding a total of nine patients. Six more patients reported the presence of pain symptoms in their family members, however; this could not be clinically confirmed.
  
  
  RESULTS
  The case histories of the nine individuals with 'familial' CRPS suggested a younger age at onset and more frequent history of migraine versus the non-familial patients. A pattern of inheritance could not be ascertained.
  
  
  CONCLUSIONS
  This data supports the hypothesis that CRPS can be familial and hence may have a genetic basis in some families. Larger studies will be needed to ascertain clearer patterns of inheritance and to determine whether the clinical features of 'familial' CRPS are the same as the sporadic form.
authors.affiliation: Department of Neurology, Baylor College of Medicine, Houston, Texas, USA.
authors.forename: Peyman
authors.initials: P
authors.lastname: Shirani
authors.forename: Ali
authors.initials: A
authors.lastname: Jawaid
authors.forename: Paolo
authors.initials: P
authors.lastname: Moretti
authors.forename: Elham
authors.initials: E
authors.lastname: Lahijani
authors.forename: Alicia R
authors.initials: AR
authors.lastname: Salamone
authors.forename: Paul E
authors.initials: PE
authors.lastname: Schulz
authors.forename: Everton A
authors.initials: EA
authors.lastname: Edmondson
mesh_terms: D000328:Adult; D017668:Age of Onset; D002648:Child; D020918:Complex Regional Pain Syndromes / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics*; D005192:Family Health; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D012720:Severity of Illness Index; D055815:Young Adult