Abstract
Rheumatoid arthritis (RA) is an autoimmune disease cause of disability and high costs. To determine the effectiveness of therapy with biologic- and disease-modifying antirheumatic drugs (DMARDs) in patients with RA and factors associated with the control of the disease. Retrospective cohort study of RA patients receiving treatment with DMARDs in a rheumatologic healthcare institution in five Colombian cities from December 2009 to August 2013. The effectiveness was assessed by Disease Activity Score-28 (DAS-28) and a lower value of 2.6 was considered remission. A total of 827 patients were studied for an average observation period of 17.3±11.0months, with mean age 54.3±13.1years. The most frequently used DMARDs were methotrexate, leflunomide and chloroquine. The most frequently used biological DMARDs were etanercept and abatacept. Initially, 17.8% of the patients received some biological DMARDs in comparison with 28.7% at the end of the observation period. A median DAS28 of 3.5 was found, which was reduced by the end of the observation period to 2.8 (p<0.001), and cases of patients who were in remission increased from 30.1% to 42.9%. Treatment with leflunomide (OR: 0.47; CI 95%: 0.35-0.64, p<0.001) or rituximab (OR: 0.37; CI 95%: 0.17-0.83, p=0.016) was associated with a lesser probability of reaching remission. To be treated in the city of Manizales (OR: 2.56; CI 95%: 1.36-4.82, p=0.004) was associated with a high probability of remission. Biological and DMARDs therapy for RA was effective in a relevant proportion of Colombian patients as a consequence of management with strategies set on remission aims quantified using DAS28. Cost-effectiveness of the therapy must be evaluated.
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