FRI0592 IMPACT OF INDIVIDUAL SYMPTOMS OF PSORIATIC ARTHRITIS ON PHYSICAL COMPONENT SCORE AND MENTAL COMPONENT SCORE OF SF-36 AS A MEASURE OF HEALTH RELATED QUALITY OF LIFE (QOL): AN OBSERVATIONAL COHORT STUDY

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Background:Patients with Psoriatic Arthritis (PsA) experience diverse symptoms including skin and nail psoriasis, swollen and tender joints, enthesitis, and fatigue that have shown to impair health related quality of life (QoL). We hypothesized that different elements of disease influence SF-36 physical (PCS) and mental (MCS) component summary scores differently.Objectives:The objective of the study was to assess the interaction between change in disease activity (DAS28CRP), PsA symptoms (psoriasis [PsO], nail PsO, enthesitis, fatigue, pain, and physical function) with changes in PCS and MCS scores in a PsA patient cohort exploring effect of treatment on clinical manifestations and patient-reported outcome (PRO).Methods:Data were obtained from the PIPA cohort (1) at baseline and after 4 months of treatment. Patients’ characteristics were described as medians with interquartile ranges (IQRs) and numbers with percentages. Data were presented as changes between baseline and follow-up with delta (Δ) values on xyz-plots. Associations between PCS and MCS scores, DAS28CRP, and PsA symptoms were described with fitted linear regression plane models. PCS and MCS were derived from 8 domains of SF-36 and ranged from 0-100 with lower values reflecting more impaired QoL.Results:71 PsA patients were included in the study. 40 (56%) patients were female with a mean age of 50 (IQR 41-60) years and disease duration of 2.15 (IQR 0.2-9) years. Figure 1 shows associations between PsA symptoms, DAS28CRP, and PCS (green regression plane) and MCS (blue regression plane). For all PROs; pain, fatigue and physical function, improvements in both ΔPCS and Δ MCS scores were associated with improvements in either Δpain, ΔPsAID fatigue, and/or ΔHAQ, and to a larger extent than improvements in ΔDAS28CRP. Improvements in Δnail PsO (regression coefficient (RC): -0.22) and ΔPASI (RC: -0.31) positively impacts ΔMCS, without a clear association in PCS scores (RC: 0.13 and 0.38 for Δnail PsO and ΔPASI, respectively). Improvement in inflammatory features SPARCC enthesitis and DAS28CRP showed improvement in both ΔPCS and ΔMCS.Figure 1.Association between disease activity, individual symptoms and PCS/MCS PCS; physical component summary (green regression plane), MCS; mental component summary (blue regression plane). Arrows indicate the positive improvement vector. SF-36: short form-36, CI: Confidence Interval, DAS28CRP: disease activity score with 28 joints and c-reactive protein, PASI: Psoriasis Area Severity Index, SPARCC: Spondyloarthritis Research Consortium of Canada enthesitis index, VAS: visual analogue scale, PsAID: Psoriatic Arthritis Impact of Disease, HAQ: Health Assessment QuestionnaireConclusion:Pain and fatigue are well-known factors to impair QoL in PsA patient. Here we show that diminishing these factors, pain and fatigue, improved both PCS and MCS scores more than changes in DAS28CRP. Improvements in skin and nail manifestations impacted MCS scores and are as important as changes in joint manifestations which affect PCS and MCS scores equally.