title: High prevalence of hyperhomocysteinemia in critically ill patients.
abstract: OBJECTIVE
  To test the hypothesis that the prevalence of hyperhomocysteinemia is increased in critically ill patients and correlates with disease severity and mortality in these patients.
  
  
  METHODS
  A prospective study.
  
  
  METHODS
  Three medical intensive care units at the University of vienna Medical School serving both medical and surgical patients.
  
  
  METHODS
  All consecutive admissions (n = 56) during a period of 4 wks. A total of 112 age- and gender-matched healthy individuals constituted the control group.
  
  
  METHODS
  None.
  
  
  RESULTS
  Blood samples were drawn within 24 hrs after admission for analysis of total homocysteine (tHcy), folate, vitamin B6 levels, and vitamin B12 levels as well as to identify the 677C-->T polymorphism in the gene coding for the enzyme 5,10-methylenetetrahydrofolate reductase. Acute Physiology and Chronic Health Evaluation III scores at admission and 24 hrs after admission as well as 30-day survival were documented in all patients. Hyperhomocysteinemia was more prevalent in critically ill patients (16.1%; 95% confidence interval, 7.6% to 28.3%) compared with age- and gender-matched healthy individuals (5.4%; 95% confidence interval, 2.0% to 11.3%; chi-square test; p = .022). There was no difference in tHcy plasma concentrations in the first 24 hrs after admission to an intensive care unit between survivors and nonsurvivors. The 5,10-methylenetetrahydrofolate reductase 677C-->T polymorphism had no influence on tHcy levels and survival of intensive care unit patients.
  
  
  CONCLUSIONS
  The prevalence of hyperhomocysteinemia is increased in critically ill patients compared to age- and gender-matched healthy individuals. The clinical significance of this finding remains to be determined.
authors.affiliation: Universitätsklinik für Innere Medizin III, Universität Wien, Vienna, Austria.
authors.forename: K
authors.initials: K
authors.lastname: Schindler
authors.forename: C
authors.initials: C
authors.lastname: Zauner
authors.forename: H
authors.initials: H
authors.lastname: Buchmayer
authors.forename: M
authors.initials: M
authors.lastname: Födinger
authors.forename: G
authors.initials: G
authors.lastname: Wölfl
authors.forename: C
authors.initials: C
authors.lastname: Bieglmayer
authors.forename: G
authors.initials: G
authors.lastname: Heinz
authors.forename: A
authors.initials: A
authors.lastname: Wilfing
authors.forename: W H
authors.initials: WH
authors.lastname: Hörl
authors.forename: G
authors.initials: G
authors.lastname: Sunder-Plassmann
mesh_terms: D045103:5,10-Methylenetetrahydrofolate Reductase (FADH2); D018806:APACHE; D000368:Aged; D001483:Base Sequence; D016638:Critical Illness; D017931:DNA Primers; D005260:Female; D005787:Gene Frequency / Q000235:genetics; D005838:Genotype; D006710:Homocysteine / Q000097:blood; D006801:Humans; D020138:Hyperhomocysteinemia / Q000097:blood / Q000453:epidemiology* / Q000235:genetics; D008297:Male; D042965:Methylenetetrahydrofolate Reductase (NADPH2); D008875:Middle Aged; D008969:Molecular Sequence Data; D010088:Oxidoreductases / Q000235:genetics; D012150:Polymorphism, Restriction Fragment Length; D015995:Prevalence; D011446:Prospective Studies; D017741:Survivors / Q000706:statistics & numerical data
chemical_list: D017931:DNA Primers; D006710:Homocysteine; D010088:Oxidoreductases; D045103:5,10-Methylenetetrahydrofolate Reductase (FADH2); D042965:Methylenetetrahydrofolate Reductase (NADPH2)