Use of a multidimensional RAPID3 questionnaire to assess the achievement of remission and minimal disease activity in patients with early psoriatic arthritis treated according to Treat-to-target strategy
Authors: Loginova E. Yu. , Korotaeva T. V. , Koltakova A. D. 
Published: January 2019

The current Treat-to-target (T2T) strategy in the management of patients with psoriatic arthritis (PsA) is based on strict control over the dynamics of a patient's status and timely correction of therapy according to the presence or absence of remission or minimal disease activity (MDA) within 6 months after treatment initiation. The multidimensional RAPID3 questionnaire based on the patient's own opinion of his/her health status, has demonstrated its high effectiveness in assessing remission in patients with rheumatoid arthritis (RA). The possibilities of using the RAPID3 questionnaire in patients with early PsA (ePsA) with T2T strategy have not yet been studied.Objective: to investigate whether the multi-dimensional RAPID3 questionnaire may be used to assess the achievement of remission and MDA in ePsA patients with a T2T (Treat-to-target) strategySubjects and methods. The investigation enrolled 61 patients (29 men and 32 women) with ePsA meeting the 2006 CASPAR criteria; the mean age of the patients was 37±10.6 years; the duration of PsA and psoriasis was 11.3±10.2 and 75.4±80.9 months, respectively. The patients were followed up for 12 months during the open-label REMARCA study performed by the T2T principles. At baseline, all the patients were given methotrexate (MTX; Methoject) subcutaneously at a dose of 10 mg/week, with escalation by 5 mg every 2 weeks up to 20–25 mg/week. If there was no low disease activity (LDA), DAS28/DAS remission, or MDA after 3 months, the patients received combined therapy with MTX 20–25 mg/week and adalimumab (ADA) or ustekinumab (UST) at standard doses. All the patients underwent standard rheumatologic examination before therapy and every 3 months. The investigators calculated tender joint count (TJC) among 78 joints; swollen joint count (SJC) among 76 joints, the Ritchie articular index, and the number of entheses by the Leeds Enthesitis index (LEI). Joint pain measurement, patient (PGA) and physician (PhGA) global assessment on visual analog scale (VAS) was performed, the serum level of C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) were evaluated. DAS and DAS28, HAQ and RAPID3 functional index were estimated. The number of patients achieving LDA, DAS/DAS28 remission, and MDA were determined. Results and discussion. At 1 year of therapy, 36 (59%) out of the 61 patients and 25 (41%) out of the 61 patients were treated with MTX and this drug in combination with ADA or UST, respectively. After 1 year of treatment, the whole group displayed a significant improvement of all PsA activity parameters as compared with baseline values: DAS, 3.93 [3.20; 4.58] / 1.36 [0.82; 2.25], SJC, 7 [5; 11] / 1 [0; 3], TJC, 8 [6; 1] / 1 [0; 3], PhGA, 56 [48; 69] / 10 [5; 20] and VAS pain, 54 [48; 68] / 11 [1; 20], PGA, 55 [49; 68] / 14 [7; 24], HAQ, 0.75 [0.50; 1] / 0 [0; 0.63], respectively. There was a significant correlation of RAPID3 with PsA activity and CRP. MDA was seen in 43 (70.5%) out of the 61 patients. Among the patients who had achieved MDA, the RAPID3 values corresponded to remission, but were significantly higher in the patients who had not attained MDA: 2.5 [1.3; 5.3] and 8.1 [6.0; 15.1], respectively. RAPID3 demonstrated high sensitivity in assessing the achievement of remission, LDA, and MDA in patients with ePsA.Conclusion. RAPID3 based on a patient's personal opinion of his/her disease is a simple and reliable tool to assess the disease activity in patients with ePsA and to monitor the efficiency of therapy with a T2T strategy and may be really useful in practice.