Endothelial dysfunction is associated with insulin resistance in patients with rheumatoid arthritis

BACKGROUND AND OBJECTIVES: There is an increased incidence of cardiovascular disease in rheumatoid arthritis (RA). Endothelial dysfunction is an early step in atherogenesis that is related to insulin resistance (IR). Our objective was to determine the relationship between endothelial dysfunction and IR in RA patients. The presence of other cardiovascular risk factors (CVRF) and their relationship with endothelial dysfunction and inflammatory markers was also evaluated. PATIENTS AND METHOD: Twenty RA patients without cardiovascular disease were studied. CVRF, treatments, body mass index, abdominal perimeter, clinical disease activity (DAS28), erythrocyte sedimentation rate, reactive C protein, lipid profile, homocisteine and insulin resistance (QUICKI) were determined. Endothelial function was measured by laser-doppler. RESULTS: We observed a positive correlation between the QUICKI index and microvascular endothelial function. We did not observe any relationship between endothelial function and inflammatory or clinical activity. CONCLUSIONS: In our population, the presence of IR in AR patients is associated with the development of endothelial dysfunction rather than with the degree of inflammatory response.