title: [Activated protein C resistance in patients with central retinal vein occlusion in comparison to patients with a history of deep-vein thrombosis and a healthy control group].
abstract: BACKGROUND
  The recently described "APC resistance" caused by a mutant form of factor V (factor V Leiden) is the most frequent cause of hereditary thrombosis. This study was carried out to investigate the association between activated protein C resistance and central retinal vein occlusion (CRVO). We evaluated the prevalence of APC resistance in patients with CRVO, patients with a history of deep-vein thrombosis, and a healthy control group.
  
  
  METHODS
  We examined 107 patients with CRVO, 112 patients with deep-vein thrombosis and 70 healthy individuals. The test performed was a modified APC-resistance assay using factor V-deficient plasma.
  
  
  RESULTS
  We identified APC resistance in 5.6 % of patients with CRVO and in 5.7 % of the control group. All carriers were heterozygous. In the deep-vein thrombosis group 23.2 % tested positive for APC resistance. Four patients were homozygous and 22 were heterozygous carriers.
  
  
  CONCLUSIONS
  These results indicate that APC resistance has no major role in the pathogenesis of CRVO. Routine testing for the presence of factor V Leiden mutant in CRVO is not necessary.
authors.affiliation: Universitäts-Augenklinik Leipzig.
authors.forename: S
authors.initials: S
authors.lastname: Faude
authors.forename: F
authors.initials: F
authors.lastname: Faude
authors.forename: A
authors.initials: A
authors.lastname: Siegemund
authors.forename: P
authors.initials: P
authors.lastname: Wiedemann
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005165:Factor V / Q000235:genetics; D005260:Female; D006580:Genetic Carrier Screening; D006801:Humans; D008297:Male; D008875:Middle Aged; D010314:Partial Thromboplastin Time; D012170:Retinal Vein Occlusion / Q000097:blood / Q000175:diagnosis / Q000235:genetics*; D013924:Thrombophlebitis / Q000097:blood / Q000175:diagnosis / Q000235:genetics*
chemical_list: C095381:factor V Leiden; D005165:Factor V