title: Retinal vein occlusion in Armenia.
abstract: OBJECTIVE
  To determine the demographic characteristics, associated ophthalmic and systemic conditions of retinal vein occlusion (RVO) and associations of central retinal vein occlusion among Armenian patients.
  
  
  METHODS
  A retrospective study of 460 patients aged 30 years and older with a clinical diagnosis of RVO who were seen in the five-year period between January 1, 1993, and December 31, 1997 at the Eye Hospital.
  
  
  RESULTS
  Signs of central RVO were found in 297 eyes (64.5%), branch RVO in 163 eyes (35.5%). Among the 460 patients occlusion was hemispheric in 4 eyes (2.4%), hemicentral in 5 eyes (3%). CRVO was more common among the younger patients (odds ratio [OR] = 2.42, 95% confidence interval [CI]: 1.06-5.65). Hypercoagulability was noted in the majority of RVO cases. Glaucoma was an associated condition (12.6%). Systemic hypertension was the most frequent association. In CRVO a significant association was found with hypertension (OR = 1.89, 95% CI: 1.23-2.70).
  
  
  CONCLUSIONS
  Our results suggest RVO is associated with glaucoma and hypertension. RVO was more closely associated with hypertension than BRVO. There were no differences in the distribution for the site of occlusion with regard to sex in patients with CRVO and BRVO. No seasonal pattern was found in the onset of any type of RVO. Hypercoagulability may be a contributing factor in the pathogenesis. The findings reinforce recommendations to carefully evaluate patients with RVO for open-angle glaucoma, and to diagnose and treat systemic hypertension.
authors.affiliation: Department of Ophthalmology, Medical University of Yerevan, Republic of Armenia.
authors.forename: A S
authors.initials: AS
authors.lastname: Malayan
authors.forename: M L
authors.initials: ML
authors.lastname: Shakhsuvaryan
authors.forename: G L
authors.initials: GL
authors.lastname: Grigoryan
authors.forename: A K
authors.initials: AK
authors.lastname: Melkonyan
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000704:Analysis of Variance; D001136:Armenia / Q000453:epidemiology; D005260:Female; D005901:Glaucoma / Q000150:complications; D006801:Humans; D006973:Hypertension / Q000150:complications; D008297:Male; D008875:Middle Aged; D012170:Retinal Vein Occlusion / Q000097:blood / Q000150:complications / Q000453:epidemiology* / Q000473:pathology; D012189:Retrospective Studies; D014792:Visual Acuity