Effect of thrombocytosis on cardiovascular risk in rheumatoid arthritis

BACKGROUND: Patients with rheumatoid arthritis have a high level of comorbidity, and their most common and socially significant conditions are cardiovascular diseases, which represent a major cause of mortality. Currently, there are no data on the differences in cardiovascular risk scales in patients with rheumatoid arthritis depending on the presence or absence of thrombocytosis. AIM: To assess and compare cardiovascular risk according to conventional scales in patients with thrombocytosis and normal thrombocytes. MATERIALS AND METHODS: The study involved 85 patients diagnosed with rheumatoid arthritis: 40 with thrombocytosis [including 25 (62,5%) women] and 45 with normal thrombocytes [including 29 (64,4%) women]. The following scales were used to assess risk of cardiovascular complications: Systematic COronary Risk Evaluation with adjustment factor 1.5 (mSCORE), Reynolds Risk Score (RRS), QRESEARCH Cardiovascular Risk Algorithm (QRISK3), Assessing Cardiovascular Risk to Scottish Intercollegiate Guidelines Network / SIGN to Assign Preventative Treatment (ASSIGN). RESULTS: The obtained findings have demontrated that according to the mSCORE and RRS scales the patients of both groups had almost identical parameters; however, according to the ASSIGN and QRISK3 high risk of cardiovascular complications has been detected nearly twice as frequently in the patients with rheumatoid arthritis and thrombocytosis in comparison with those with normal level of thrombocytes. It is also worth noting that more frequent determination of high risk of cardiovascular complications by the QRISK3 was statistically significant. CONCLUSIONS: The QRISK3 calculation has shown significantly higher prevalence of high-risk cardiovascular complications among the patients with platelet counts 450 ∙ 109/l compared with those with platelet levels within the reference values. Thus, the QRISK3 scale can be considered as more informative for estimating risk of cardiovascular complications in rheumatoid arthritis.