Sensitivity of the classification of psoriatic arthritis criteria in early psoriatic arthritis

Longitudinal study of the bidirectional association between pain and depressive symptoms in patients with psoriatic arthritis

“…The cohort consists of patients referred to the clinic by family doctors and other medical specialists and includes the spectrum of disease. More than 98% of patients fulfilled the Classification of Psoriatic Arthritis criteria for PsA classification (20,21).…”

Fibromyalgia and Enthesitis in Psoriatic Arthritis. Time to “Characterize” and “Refine” Clinical Definitions

“…The lack of definition of these entry criteria, crucial for applying the CASPAR criteria, may explain some of the difficulties in clinical research in PsA; for instance, validation of the CAS-PAR criteria for diagnostic purposes encounters difficulty when criteria are used in a general setting 5 .…”

“…Two recent studies 5,6 testing the sensitivity of the CAS-PAR criteria in early PsA found different results (99.1% vs 77.3%); apart from the methodological differences in the 2 studies, it is important to emphasize that the clinical diagnosis of PsA relied on clinical expertise as the "gold standard." Moreover, as many as 43% of patients, in the study with the lowest sensitivity, had a clinical pattern of tenosynovitis, enthesitis, or dactylitis.…”

Epidemiology of Psoriatic Arthritis

“…These new classification criteria were developed in patients with long-standing disease and in the original study had specificity of 98.7% and sensitivity of 91.4%. Subsequently, the criteria were shown to have excellent sensitivity in both early and late disease 9 . The CASPAR criteria were found to have been developed using sound measurement principles although they remain to be fully validated 10 .…”

“…Identifying inflammatory musculoskeletal disease is usually not difficult for rheumatologists, but may be a stumbling block for wider application of criteria by physicians, whether in the community or in dermatology practices. In spite of this drawback, CASPAR criteria have been recognized to be simple and easy to apply to data collected retrospectively 9,12 . Moreover, using these criteria it is possible to classify patients as having PsA even when they do not have current, past, or family history of psoriasis.…”