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Effect of rheumatoid factor on mortality and coronary heart disease
  1. Gunnar Tomasson1,
  2. Thor Aspelund2,3,
  3. Thorbjorn Jonsson4,
  4. Helgi Valdimarsson4,
  5. David T Felson1,
  6. Vilmundur Gudnason2,3
  1. 1Section of Rheumatology and the Clinical Epidemiology Research and Training Unit, Boston University School of Medicine, Boston, Massachusetts, USA
  2. 2Icelandic Heart Association, Kopavogur, Iceland
  3. 3University of Iceland, Reykjavik, Iceland
  4. 4Landspitali University Hospital, Reykjavik, Iceland
  1. Correspondence to Gunnar Tomasson, Boston University School of Medicine, 650 Albany Street, Suite X200, Boston, MA 02118, USA; tomasson{at}bu.edu

Abstract

Objective An association between rheumatoid factor (RF) and increased mortality has been described in individuals with rheumatoid arthritis. The objective of this study was to determine the effect of RF on mortality and coronary heart disease (CHD) in the general population.

Methods Subjects were participants in a population-based study focused on cardiovascular disease who attended for a study visit during the years 1974–84. RF was measured and information obtained on cardiovascular risk factors, joint symptoms and erythrocyte sedimentation rate (ESR). The subjects were followed with respect to mortality and incident CHD through 2005. Adjusted comparison of overall survival and CHD event-free survival in RF-positive versus RF-negative subjects was performed using Cox proportional hazards regression models.

Results Of 11 872 subjects, 140 had positive RF. At baseline RF was associated with diabetes mellitus and smoking and inversely associated with serum cholesterol. RF-positive subjects had increased all-cause mortality (HR 1.47, 95% CI 1.19 to 1.80) and cardiovascular mortality (HR 1.57, 95% CI 1.15 to 2.14) after adjusting for age and sex. Further adjustment for cardiovascular risk factors and ESR only modestly attenuated this effect. An increase in CHD among the RF-positive subjects did not reach statistical significance (HR 1.32, 95% CI 0.96 to 1.81, adjusted for age and sex). Subjects with RF but without joint symptoms also had increased overall mortality and cardiovascular mortality (HR for overall mortality 1.33, 95% CI 1.01 to 1.74, after adjustment).

Conclusion In a general population cohort, RF was associated with increased all-cause mortality and cardiovascular mortality after adjustment for cardiovascular risk factors, even in subjects without joint symptoms.

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Footnotes

  • Funding NIH AR47785.

  • Ethics approval This study was conducted with the approval of the Boston Medical Center IRB. The conduct of the Reykjavik Study was approved by the National Bioethics Committee of Iceland.

  • Competing interests None.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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