title: Hyperhomocysteinemia and low methionine stress are risk factors for central retinal venous occlusion in an Indian population.
abstract: OBJECTIVE
  The underlying cause of disturbed homocysteine metabolism is incompletely understood in young persons with central retinal vein occlusion (CRVO) with mild hyperhomocysteinemia (HHcys) and no other systemic disease in India. A 2-year prospective study was undertaken to determine whether HHcys is a risk factor for CRVO in an Indian population.
  
  
  METHODS
  The prevalence of fasting HHcys was evaluated in a consecutive series of 29 patients with CRVO (mean age, 30 +/- 6 years) along with 57 age- and sex-matched control subjects (healthy subjects, mean age 27 +/- 5 years). Strict inclusion and exclusion criteria were used. Plasma levels of homocysteine (Hcys), methionine, cysteine, glutathione, B(12), and folate were measured. Multivariate logistic regression analysis was performed to determine the risk factors for CRVO.
  
  
  RESULTS
  Fifteen of 29 patients with CRVO (51.72%) exhibited HHcys (>15 muM). The mean Hcys level was significantly elevated in the patients with CRVO (19.1 +/- 13.1 muM) compared with that in the healthy control subjects (14.7 +/- 6.2 muM) with P = 0.04. The increased Hcys levels in CRVO cases was associated with decreased methionine (P = 0.052) and decreased B(12) (P = 0.001). A multivariate logistic regression analysis revealed an odds ratio of 1.9 (95% CI = 0.50-7.16) for Hcys and 15.9 for methionine (95%CI = 1.50-169.62; P = 0.022).
  
  
  CONCLUSIONS
  Elevated Hcys and low methionine were risk factors for CRVO in an Indian population.
authors: Biochemistry Research Department, Sankara Nethralaya Vision and Medical Research Foundation, 18 College Road, Chennai 600 006, India. angayarsamy@yahoo.co.in
authors: Angayarkanni
authors: A
authors: Narayanasamy
authors: Barathi
authors: B
authors: Subramaniam
authors: Coral
authors: C
authors: Karunakaran
authors: Punitham
authors: P
authors: Ranganathan
authors: Ramakrishnan
authors: R
authors: Sivaramakrishnan
authors: Tarun
authors: T
authors: Sharma
authors: Vasanthi Sengamedu
authors: VS
authors: Badrinath
authors: Joseph
authors: J
authors: Roy
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D003545:Cysteine / Q000097:blood; D005260:Female; D005492:Folic Acid / Q000097:blood; D005978:Glutathione / Q000097:blood; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D020138:Hyperhomocysteinemia / Q000097:blood / Q000150:complications* / Q000208:ethnology; D007194:India / Q000453:epidemiology; D008297:Male; D008715:Methionine / Q000097:blood*; D015995:Prevalence; D011446:Prospective Studies; D012170:Retinal Vein Occlusion / Q000097:blood / Q000208:ethnology / Q000209:etiology*; D012307:Risk Factors; D014805:Vitamin B 12 / Q000097:blood
chemical_list: D006710:Homocysteine; D005492:Folic Acid; D008715:Methionine; D005978:Glutathione; D003545:Cysteine; D014805:Vitamin B 12