BACKGROUND: Rheumatoid arthritis is associated with increased cardiovascular mortality and morbidity. OBJECTIVE: To assess the effect of severe extra-articular rheumatoid arthritis (ExRA) manifestations on the risk of cardiovascular disease (CVD) in patients with rheumatoid arthritis. METHODS: Patients with ExRA (n = 81) according to predefined criteria and controls (n = 184) without evidence of extra-articular disease were identified from a large research database of patients with rheumatoid arthritis. In a structured review of the medical records, the occurrence and the date of onset of clinically diagnosed CVD events were noted. Cox proportional hazards models were used to estimate the effect of ExRA on the risk of first ever CVD events after the diagnosis of rheumatoid arthritis. ExRA manifestations were modelled as time-dependent covariates, with adjustment for age, sex and smoking at the diagnosis of rheumatoid arthritis. Onset of erosive disease and rheumatoid factor seropositivity were entered as time-dependent variables. Patients were followed until onset of CVD, death or loss to follow-up. RESULTS: ExRA was associated with a significantly increased risk of first ever CVD events (p<0.001), and also with an increased risk of new-onset coronary artery disease, adjusted for age, sex and smoking (hazard ratio (HR): 3.16; 95% confidence interval (95% CI: 1.58 to 6.33). The association between ExRA and any first ever CVD event remained significant when controlling for age, sex, smoking, rheumatoid factor and erosive disease (HR: 3.25; 95% CI: 1.59 to 6.64). CONCLUSION: Severe ExRA manifestations are associated with an increased risk of CVD events in patients with rheumatoid arthritis. This association is not due to differences in age, sex, smoking, rheumatoid factor or erosive joint damage. It is suggested that systemic extra-articular disease is a major determinant of cardiovascular morbidity in rheumatoid arthritis.
BACKGROUND:Rheumatoid arthritis is associated with increased cardiovascular mortality and morbidity. OBJECTIVE: To assess the effect of severe extra-articular rheumatoid arthritis (ExRA) manifestations on the risk of cardiovascular disease (CVD) in patients with rheumatoid arthritis. METHODS:Patients with ExRA (n = 81) according to predefined criteria and controls (n = 184) without evidence of extra-articular disease were identified from a large research database of patients with rheumatoid arthritis. In a structured review of the medical records, the occurrence and the date of onset of clinically diagnosed CVD events were noted. Cox proportional hazards models were used to estimate the effect of ExRA on the risk of first ever CVD events after the diagnosis of rheumatoid arthritis. ExRA manifestations were modelled as time-dependent covariates, with adjustment for age, sex and smoking at the diagnosis of rheumatoid arthritis. Onset of erosive disease and rheumatoid factor seropositivity were entered as time-dependent variables. Patients were followed until onset of CVD, death or loss to follow-up. RESULTS: ExRA was associated with a significantly increased risk of first ever CVD events (p<0.001), and also with an increased risk of new-onset coronary artery disease, adjusted for age, sex and smoking (hazard ratio (HR): 3.16; 95% confidence interval (95% CI: 1.58 to 6.33). The association between ExRA and any first ever CVD event remained significant when controlling for age, sex, smoking, rheumatoid factor and erosive disease (HR: 3.25; 95% CI: 1.59 to 6.64). CONCLUSION: Severe ExRA manifestations are associated with an increased risk of CVD events in patients with rheumatoid arthritis. This association is not due to differences in age, sex, smoking, rheumatoid factor or erosive joint damage. It is suggested that systemic extra-articular disease is a major determinant of cardiovascular morbidity in rheumatoid arthritis.
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