AB0193 PRESENCE OF SUBLINICAL SYNOVITIS IN A ESTABLISHED RHEUMATOID ARTHRITIS COHORT

Background: Some studies prove that a significant percentage of patients with rheumatoid arthritis (RA) in sustained clinical remission has radiological progression or joint damage, and the presence of residual activity objectified by imaging studies such as ultrasonography could be related to a relapse or flare of RA.(1,2) Objectives: To determine the presence of subclinical synovitis measured by ultrasonography in patients with RA on sustained clinical remission from the Rheumatology service at Hospital de Clinicas, San Lorenzo, Paraguay. Materials and Methods: Prospective, cross sectional, descriptive study, in RA patients meeting ACR/EULAR 2010 criteria, older than 18 years, on sustained clinical remission (≥6 months), measured by ESR-DAS28 ( SPSS 23rd version was used for data analysis. Quantitative variables were presented as means and qualitative as frequencies. Chi square test was performed for comparisons between dichotomous variables and t Student for continuous. For comparisons between variables the Spearman’s rank correlation coefficient was performed, and p≤0.05 for statistical significance. Factors predicting subclinical synovitis were analyzed with Odds Ratio (OR) CI 95%. Results: From 147 patients, 31 (21%) met remission criteria; 87.1% women, mean age 51.9±14.8 years. Mean disease duration was 9,06±10,81 years. 64,5% were RF and ACPA positive and 25,9% had erosions. Ultrasonograms were made in 20 joints of both hands: radiocarpals (RC), metacarpophalangeals (MCP) and proximal interphalangeals (PIP). 12 patients (38.7%) presented subclinical synovitis (SH≥2+PD), more frequently on RC (29% right, 22.6% left), and MCP (9.7% on 2RMCP, 9.7% 4LMCP). These patients had greater CDAI (3.9±1.37 vs 2.89±1.15, p=0.03), HAQ (0.14±0.29 vs 0.00±0.00, p=0.04), CRP (9.90±7.46 vs 4.74±2.30, p=0.00) RF levels (502.67±275.66 vs 200.92±158.43, p=0,00), greater prednisone (16.5% vs 3.2%, p=0.04), and methotrexate use (20.16±5.54 vs 17.50±3.98, p=0.01). None of the healthy controls presented subclinical synovitis. In binary logistic regression CRP levels, RF titers and methotrexate doses were associated to subclinical synovitis. This association is not found in multivariate logistic regression. Negative association was found between subclinical synovitis and two csDMARDs use. Conclusion: This is the first study of its type in Paraguayan patients, which clearly evidenced that an important part of RA patients in clinical remission still presented subclinical synovitis (HS≥2 + PD). It was associated with CRP, RF and methotrexate dose. References: [1]Plaza M, Nowakowska-Plaza A, Pracon G, Sudol-Szopinska I. Role of ultrasonography in the diagnosis of rheumatic diseases in light of ACR/EULAR guidelines. J Ultrason. marzo de 2016;16(64):55-64. [2]Foltz V, Gandjbakhch F, Etchepare F, Rosenberg C, Tanguy ML, Rozenberg S, et al. Power Doppler ultrasound, but not low-field magnetic resonance imaging, predicts relapse and radiographic disease progression in rheumatoid arthritis patients with low levels of disease activity. Arthritis & Rheumatism. 2012;64(1):67-76. Disclosure of Interests: None declared