title: Hyperhomocysteinemia, low folate and vitamin B12 concentrations, and methylene tetrahydrofolate reductase mutation in cerebral venous thrombosis.
abstract: OBJECTIVE
  Elevated plasma levels of homocysteine are associated with an increased risk of deep-vein thrombosis. Through a case-control study, we examined the potential association among homocysteine, folate and vitamin B12 levels, and the common C677-->T mutation in the methylene tetrahydrofolate reductase (MTHFR) gene in patients with cerebral venous thrombosis (CVT).
  
  
  METHODS
  Forty-five patients with CVT and 90 control subjects were studied. Plasma levels of homocysteine (fasting and after methionine load), folate, and vitamin B12 were measured. Genotyping of the MTHFR gene was also performed. The estimated risk of CVT associated with hyperhomocysteinemia, low vitamin levels, and MTHFR mutation were expressed as odds ratio (OR) and its 95% CI (crude and after adjusting by other independent variables).
  
  
  RESULTS
  The adjusted OR for CVT associated with high (>90th percentile) fasting levels of homocysteine was 4.6 (1.6 to 12.8). The association between low plasma folate values (<10th percentile) and presence of CVT was 3.5 (1.2 to 10.0) after adjustment for confounding factors. There was a higher frequency of MTHFR mutation in patients with CVT (22% versus 10%), but it was not statistically significant (P=0.098). Patients with MTHFR mutation and low folate levels presented the highest homocysteine levels.
  
  
  CONCLUSIONS
  High plasma concentrations of homocysteine and low plasma folate levels were associated with an increased risk of CVT in this population in which low socioeconomic conditions and deficient nutritional status may contribute to its relatively high incidence.
authors.affiliation: Stroke Clinic, Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez, Mexico. carloscantu_brito@hotmail.com
authors.forename: Carlos
authors.initials: C
authors.lastname: Cantu
authors.forename: Elisa
authors.initials: E
authors.lastname: Alonso
authors.forename: Aurelio
authors.initials: A
authors.lastname: Jara
authors.forename: Leticia
authors.initials: L
authors.lastname: Martínez
authors.forename: Camilo
authors.initials: C
authors.lastname: Ríos
authors.forename: María de los Angeles
authors.initials: Mde L
authors.lastname: Fernández
authors.forename: Irma
authors.initials: I
authors.lastname: Garcia
authors.forename: Fernando
authors.initials: F
authors.lastname: Barinagarrementeria
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D005260:Female; D005492:Folic Acid / Q000097:blood*; D006801:Humans; D020138:Hyperhomocysteinemia / Q000150:complications* / Q000453:epidemiology; D015994:Incidence; D020767:Intracranial Thrombosis / Q000097:blood* / Q000453:epidemiology / Q000235:genetics*; D008297:Male; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D008875:Middle Aged; D009154:Mutation; D009752:Nutritional Status; D012307:Risk Factors; D012959:Socioeconomic Factors; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D005492:Folic Acid; D042965:Methylenetetrahydrofolate Reductase (NADPH2); D014805:Vitamin B 12