Peculiarities of pharmacotherapy of patients with rheumatoid arthritis associated with interstitial lung disease

Abstract

Objective: a comparative study of the peculiarities of pharmacotherapy of rheumatoid arthritis (RA) in presence and in absence of interstitial lung disease (ILD).Material and methods. The study included 1034 patients with active RA who met the 2010 ACR/EULAR criteria. Patients were divided into two groups: with ILD according to high-resolution computed tomography of the lungs (n=82) and without ILD or other types of chronic obstructive pulmonary diseases, including bronchial asthma (52 patients excluded; n=900). Based on medical documentation, archived medical records and medical history, a “drug card” was created for all stages of pharmacotherapy of patients with active RA. The Cumulative Illness Index Score (CIRS) was used to assess the profile and severity of comorbidities.Results and discussion. The main indicators of RA activity in the patients of the two groups were comparable, but a greater number of comorbidities (p˂0.0001) and a higher value of the CIRS multimorbidity index (p˂0.0001) were found in the group with ILD. The presence of ILD had no influence on the frequency of prescription, the total duration of use and the maximum dose of glucocorticoids (GC) (p˂0.05). The average dose of GC was statistically significantly higher in the group with ILD (p=0.008). These patients were taking disease-modifying antirheumatic drugs (DMARDs): methotrexate (p=0.04), leflunomide (p=0.02) and sulfasalazine (p=0.03), less frequently, but they took hydroxychloroquine significantly more frequently (p=0.02) with a comparable total duration of use of each medication. RA patients with ILD and without ILD received biologic DMARDs (bDMARDs) and targeted synthetic DMARDs (tsDMARDs) in 62.2 and 59.6% of cases, respectively (p˂0.05). At the same time, patients without ILD had experience of taking a greater number of different bDMARDs/tsDMARDs (p=0.03). In the group with ILD, patients more frequently received anti-B-cell therapy (p˂0.0001) and significantly less frequently drugs of other classes: tumour necrosis factor α inhibitors (p˂0.0001) and interleukin 6 inhibitors (p=0.01), T-cell costimulation blocker (p=0.04) and Janus kinase inhibitors (p=0.001). Patients with ILD were statistically significantly older at the start of bDMARD/tsDMARD therapy (p˂0.0001), and the period from the onset of RA to the start of bDMARD/tsDMARD therapy was comparable in both groups (p˂0.05).Conclusion. The observed peculiarities of pharmacotherapy in the group with ILD (frequency of use, choice and dose of GC, DMARDs, biologics and tsDMARDs) are probably related to the presence of ILD on the one hand and to the characteristics of concomitant pathology and older age on the other, as the activity of RA was comparable in our patients with and without ILD.