Abstract: Objective Patients with rheumatoid arthritis (RA) or systemic lupus erythematosus (SLE) have an increased premature prevalence of atherosclerosis. We aimed to determine whether there are differences in the prevalence of classic cardiovascular risk factors between SLE and RA. We also analysed the effect of traditional cardiovascular risk factors on the development of subclinical atherosclerosis in both conditions and if some disease-characteristic features are associated with these traditional cardiovascular risk factors. Methods This was a cross-sectional study encompassing 602 individuals, 276 SLE and 326 RA patients. Subclinical atherosclerosis (presence of carotid plaques and carotid intima media thickness [cIMT]) was determined by carotid ultrasonography. A multivariable regression analysis was performed to evaluate whether classic cardiovascular-related risk factors differentially influence subclinical carotid atherosclerosis in SLE compared to RA patients. Results Age (interaction factor [if] p=0.000), hypertension (if p=0.034), and diabetes (if p=0.037) had a higher effect on cIMT in RA than in SLE subjects. However, these traditional cardiovascular factors did not yield different effects on the presence of carotid plaques in RA and SLE when the univariate interaction was analysed. In addition, no differences were found in the influence of hypertension, diabetes, dyslipidaemia or current smoking on cIMT or carotid plaque after adjusting for demo graphics, the presence of other traditional cardiovascular factors, and disease-related data. Moreover, the additive effect of several cardiovascular risk factors on the subclinical carotid atherosclerosis did not differ between the two diseases. Conclusion The influence of traditional cardiovascular risk factors on cIMT and carotid plaque is similar in RA and SLE.

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