Antioxidants and other novel cardiovascular risk factors in subjects with rheumatoid arthritis in a large population sample.
OBJECTIVE
To compare antioxidants and other novel and traditional cardiovascular disease (CVD) risk factors in participants with rheumatoid arthritis (RA) and non-RA controls in a large population sample.


METHODS
The Third National Health and Nutrition Examination Survey (NHANES-III) was a cross-sectional population survey in which subjects ages >or=60 underwent a musculoskeletal examination. RA subjects were defined as those who met >or=3 of 6 available 1987 American College of Rheumatology (ACR) criteria. Non-RA subjects were defined as those who met no ACR criteria. We performed univariate and multivariate analyses of the association between RA and each novel and traditional CVD risk factor in RA versus non-RA subjects.


RESULTS
The sample included 5,302 subjects ages >or=60, with 131 (2.5%) RA and 4,444 (84%) non-RA participants. A total of 727 subjects were excluded. Plasma levels of antioxidants alpha-carotene, beta-cryptoxanthin, lutein/zeaxanthin, and lycopene were significantly lower in RA subjects compared with non-RA subjects in multivariate analysis adjusting for potential confounders. Compared with non-RA participants, RA subjects were more likely to have increased C-reactive protein (CRP) levels in multivariate analysis adjusting for potential confounders. RA and non-RA participants had similar prevalence of traditional CVD risk factors and previous CVD.


CONCLUSIONS
In this large population study, RA subjects had similar prevalence of previous CVD and traditional CVD risk factors as controls. Among novel CVD risk factors, plasma carotenoid levels were significantly lower and CRP level was significantly higher in RA compared with non-RA subjects after adjustment for potential confounders. Further research should evaluate whether these differences account for the observed increased incidence of CVD in individuals with RA.
De Pablo
Paola
P
Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA. paoladepablo@post.harvard.edu
Dietrich
Thomas
T
Karlson
Elizabeth W
EW
D000368:Aged; D000369:Aged, 80 and over; D000975:Antioxidants / Q000378:metabolism*; D001172:Arthritis, Rheumatoid / Q000097:blood* / Q000150:complications*; D002097:C-Reactive Protein / Q000378:metabolism*; D002318:Cardiovascular Diseases / Q000097:blood / Q000150:complications* / Q000453:epidemiology*; D002338:Carotenoids / Q000097:blood; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D012307:Risk Factors; D014481:United States / Q000453:epidemiology; D014815:Vitamins / Q000097:blood
D000975:Antioxidants; D014815:Vitamins; D002338:Carotenoids; D002097:C-Reactive Protein