title: High prevalence of hyperchomocysteinemia in patients with inflammatory bowel disease: a pathogenic link with thromboembolic complications?
abstract: OBJECTIVE
  Why patients with inflammatory bowel disease are at increased risk for thrombosis is unknown. Since they may have impaired absorption of vitamins that regulate the metabolism of homocysteine, we tested the hypothesis that they have hyperhomocysteinemia, an established risk factor for arterial and venous thrombosis.
  
  
  METHODS
  The concentrations of total homocysteine (tHcy), folate and cobalamin were measured in blood samples from 61 consecutive patients with inflammatory bowel disease and 183 age- and sex-matched healthy controls.
  
  
  RESULTS
  The mean (+/- S.D.) concentration of plasma tHcy was higher in patients (12.2 +/- 7.7 micromol/l) than in controls (10.5 +/- 4.6, p = 0.045). Eight patients (13%) had concentrations of tHcy higher than the 95th percentile of distribution among controls, as compared with 9 healthy controls (5%, p = 0.04). The prevalence of folate deficiency was higher in patients (15%) than in controls (5%, p = 0.02). Oral administration of folate, cobalamin and pyridoxine to 15 patients for 30 days decreased their mean tHcy levels from 20.3 +/- 9.9 to 9.5 +/- 3.4 (p <0.001).
  
  
  CONCLUSIONS
  In patients with inflammatory bowel disease there is an increased prevalence of hyperhomocysteinemia, which can be corrected by the administration of folate, cobalamin and pyridoxine. The high prevalence of hyperhomocysteinemia may account for the thrombotic risk of IBD patients; whether or not its correction will decrease the thrombotic risk should be tested in properly designed clinical trials.
authors.affiliation: A. Bianchi Bonomi Hemophilia and Thrombosis Center, and Department of Internal Medicine, IRCCS Ospedale Maggiore, University of Milano, Italy. marco.cattaneo@unimi.it
authors.forename: M
authors.initials: M
authors.lastname: Cattaneo
authors.forename: M
authors.initials: M
authors.lastname: Vecchi
authors.forename: M L
authors.initials: ML
authors.lastname: Zighetti
authors.forename: S
authors.initials: S
authors.lastname: Saibeni
authors.forename: I
authors.initials: I
authors.lastname: Martinelli
authors.forename: P
authors.initials: P
authors.lastname: Omodei
authors.forename: P M
authors.initials: PM
authors.lastname: Mannucci
authors.forename: R
authors.initials: R
authors.lastname: de Franchis
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D020138:Hyperhomocysteinemia / Q000150:complications*; D015212:Inflammatory Bowel Diseases / Q000097:blood* / Q000150:complications; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012307:Risk Factors; D013923:Thromboembolism / Q000097:blood / Q000209:etiology*