E058 Disease activity measurement in rheumatoid arthritis - simpler in not always better!

Abstract

Abstract Background/Aims Rheumatoid arthritis is one of the commonest inflammatory arthritis (1). The traditional method of disease activity assessment would incorporate activity measures like DAS 28, CDAI and SDAI which have been validated in clinical research (2). All these indices use 28 joint assessment method. These measures use different aspects of disease activity including swollen joint count, tender joint count, patient global scores and physician global assessment scores and inflammatory markers are included in some of the measures. We conducted a small study to compare these outcome measures in patients with moderate RA (per DAS criteria) who were recruited for disease activity assessment through MSK ultrasound. Methods Of the 30 biologic naive patients recruited, 27 were included in this study. Patients with moderate disease activity (per DAS criteria) were recruited for MSK ultrasound evaluation by a single rheumatologist. Patients with a diagnosis of fibromyalgia were excluded. These patients had been reviewed by two assessors prior to USS assessment and disease activity measures updated. Patient data was collected through electronic patient records. Data was analysed through MS Excel. Results The median age was 63. There were 66% females and 34% male patients. Majority were sero positive for either RhF, Anti CCP or both (77%). Mean DAS-28 score was 4.4 and corresponding mean CDAI and SDAI scores were 22.8 and 23.5 respectively. Mean HAQ score 1.08 and median CRP was 8.6. The median composite EULAR OMERACT synovitis score was 9.18. The average physician global assessment score for disease activity before USS was 4.9/10 and it correlated well with decision to escalate treatment in 41% patients as a result of USS assessment. Conclusion With a small sample size, this project shows that simplified disease activity measures do not necessarily provide clear evidence of disease activity and are heavily influenced by patient reported outcome measures (tender joint count and global pain scores). CDAI scores can be slightly higher compared to DAS and SDAI scores for the similar patients. Physician assessment and ultrasound can provide robust evaluation of disease activity and help in decision-making. A multicentric study with a large simple size to evaluate these findings would be helpful. Judicious use of clinical evaluation and imaging can help in tailoring treatment according to patient’s clinical condition and can also save money. Disclosure H. Crawshaw: None. E. Gates: None. C. Acebes: None. M. Jamal: None.