Abstract: Objective: Subclinical atherosclerosis, defined as the presence of carotid plaques, is more frequently found in patients with axial spondyloarthritis (axSpA) than in healthy individuals. We sought to determine whether axSpA patients are more commonly reclassified into the very high cardiovascular risk category than controls after performing carotid ultrasound and if this can be linked to disease characteristics. Methods: 343 patients diagnosed with axSpA according to ASAS criteria and 177 controls were studied. Disease characteristics and Systematic Coronary Risk Evaluation (SCORE) were assessed in patients and controls. Presence of plaques and intima-media thickness (cIMT) was determined by carotid ultrasound. Multivariable regression analysis was performed to identify differences in the frequency of reclassification between patients and controls, as well as factors associated with reclassification in axSpA. Results: Carotid plaques (36% vs.25%, p=0.010) and higher cIMT (0.641± 0.121 vs. 0.602± 0.115 mm, p=0.001) were more common in patients than controls. Reclassification into the high-risk category was greater in patients (34% vs. 25%, p=0.037). Age (beta coefficient 2.74 [95%CI 1.34?5.62] vs. beta coef. 0.63 (95%CI 0.40?0.99) in patients, interaction p=0.001) and serum LDL-cholesterol (beta coef. 1.03 [95%CI 1.02?1.04] vs. beta coef. 1.00 [0.99?1.01], interaction p=0.029) showed a higher effect on reclassification in controls after multivariable analysis. Although reclassification in axSpA was associated with higher ASDAS-CRP, BASFI and BASMI scores, these associations were lost after adjusting for cardiovascular risk factors. Conclusion: Patients with axSpA are more likely to be reclassified into the very-high risk category after carotid ultrasound than controls. The influence of traditional cardiovascular risk factors on this reclassification differs between patients and controls.

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