OP0305 VALIDATION OF THE PSORIASIS EPIDEMIOLOGY SCREENING TOOL (PEST) AND THE NEW EARLY ARTHRITIS FOR PSORIATIC PATIENTS (EARP) IN PEDIATRIC POPULATION - PILOT STUDY

Background: Juvenile Psoriatic Arthritis (JPsA) is an inflammatory arthritis associated with irreversible joint damage among the pediatric population, which is associated with psoriasis in most cases. While there are few validated screening tools for diagnosis of arthritis for adult patients with psoriasis, those screening tools were never evaluated in children. Objectives: The aims of this study were to evaluate two screening tools among pediatric patients with psoriasis. Methods: Thirty-nine patients with the diagnosis of psoriasis were administered two screening questionnaires: the new Early Arthritis for Psoriatic Patients (EARP) questionnaire and the Psoriatic Arthritis Screening and Evaluation (PASE) questionnaire. All patients were evaluated by a rheumatologist for the diagnosis of JPsA, and the accuracy of the two questionnaires compared. Results: The 4/39 (10.1%) patients diagnosed with JPsA had a PEST questionnaire score of ≥ 3, compared to a median PEST score of the patients without the diagnosis of JPsA of 0 (0-2). Thus both the sensitivity and specificity of the PEST in diagnosing JPsA were 100%. For the EARP questionnaire, 8/39 patients had a screening questionnaire score of ≥ 3, suggestive of JPsA, four were true positive, and four false positive. Thus, the sensitivity and specificity of EARP in diagnosing JPsA were 100% and 89%, respectively. Conclusion: Both the PEST and EARP questionnaires were easy to use and had high sensitivity for pediatric population with psoriasis, however the PEST questionnaire had a higher specificity than the EARP. Disclosure of Interests: None declared.