Abstract

The aims of the PROKIND protocols are improvement and harmonization of the diagnostics, monitoring, treatment decision and prognosis. This article reports the results of a prospective treat-to-target observational study of patients with polyarticular juvenile idiopathic arthritis (JIA) during the first year of treatment. Disease activity was assessed with the 10-joint juvenile arthritis disease activity score (JADAS-10), functional limitation with the childhood health assessment questionnaire disability index (CHAQ-DI) and with information on overall well-being, on pain, on fatigue and on global estimation of disease activity. Overall, 129 patients with polyarticular JIA (rheumatoid factor, RF, positive (+) polyarthritis n = 22, RF negative (-) polyarthritis n = 133 from 23pediatric rheumatology institutions in Germany and Austria were recruited. Patients with initial treatment with methotrexate formed cohort1, patients with additional repeated intravenous corticosteroid pulse therapy formed cohort2 and patients with concomitant intra-articular corticosteroid administration in at least 5joints formed cohort3. The mean JADAS10 showed adecrease in disease activity from 16.4 ± 6.1 to 2.8 ± 3.6 and the decrease in the CHAQ-DI from 1.0 ± 0.8 to 0.3 ± 0.5 showed the improvement in functional capacity. Similarly, improvements in quality of life, pain and fatigue were demonstrable. A JADAS inactive disease was achieved by 18.1% at month3, 47.7% at month6 and66.7% at month12. In cohort 1 a JADAS remission was achieved by 72.4%, by 50% in cohort 2 and by 69.2% in cohort 3. An escalation to treatment with biologics was necessary in 38% of patients in cohort 1, 60% in cohort 2 and 46% in cohort 3. Using atreat-to-target approach a dramatic improvement in disease activity, functional capacity and quality of life in polyarticular JIA could be achieved. Even after 12months an inactive disease was achieved in the majority of cases.

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