WASHINGTON – Subcutaneous nodules in patients with rheumatoid arthritis signal a significantly increased risk of cardiovascular disease, based on findings from the CORRONA database.
Although subcutaneous nodules are associated with more severe rheumatoid arthritis (RA), and RA is known to be associated with an increased risk of cardiovascular disease, the findings are the first to demonstrate a link between these "conspicuous, accessible, and assessable clinical markers" and cardiovascular morbidity in RA, Dr. Prashant Kaushik reported at the annual meeting of the American College of Rheumatology.
In 23,327 RA patients included in the CORRONA (Consortium of Rheumatology Researchers of North America) database who were evaluated at 182,201 individual visits between October 2001 and September 2011, the presence of subcutaneous nodules was found to confer a 44% increase in the risk of cardiovascular disease (hazard ratio, 1.44). The association remained significant after the investigators adjusted for age, sex, age of onset of RA, presence of diabetes mellitus, hypertension, smoking, alcohol consumption, and the use of a lipid-lowering agent (adjusted hazard ratio, 1.25), said Dr. Kaushik, who is rheumatology section chief at the Stratton VA Medical Center, Albany, N.Y.
Additionally, an age-sex interaction was found for women, who had a steeper increase in risk with age, compared with men. The hazard ratios per year of age for men and women were 1.01 and 1.03, but the hazard ratio for women vs. men at age 40 was 0.39, and at age 70 was 0.59, he noted.
Patients included in the CORRONA database had an average follow-up of 3 years and 70,455 patient-years. Nearly a third had subcutaneous nodules, and 795 had a cardiovascular event including a myocardial infarction, stroke or transient ischemic attack, heart failure, and/or cardiovascular death.
While the precise mechanism of the biologic association still needs to be ascertained, these findings indicate that subcutaneous nodules, which are the most common extra-articular manifestation of RA, should serve as a red flag for clinicians, Dr. Kaushik said.
"Subcutaneous nodules may be thought of as a clinical indicator of cardiovascular disease in RA," he concluded.
Dr. Kaushik reported having no relevant financial disclosures.