Sensitivity of the classification of psoriatic arthritis criteria in early psoriatic arthritis.
OBJECTIVE
To determine the sensitivity of the CASPAR criteria in patients with early psoriatic arthritis (PsA).


METHODS
Consecutive patients with a clinical diagnosis of PsA and a disease duration < 12 months were enrolled for study. The proportion of patients meeting the criteria (i.e., the sensitivity) was determined.


RESULTS
Forty-four patients with early PsA (23 women, 21 men; mean age 51 yrs, range 16-90) were enrolled. Mean disease duration (+/- SD) was 15.8 +/- 14.3 weeks (range 0.1-50.9 wks). Thirty-four patients satisfied the criteria at the first visit (sensitivity 77.3%). Most patients met the skin and laboratory criterion, i.e., they were rheumatoid factor-negative, while only 2 satisfied the radiologic criterion.


CONCLUSIONS
Our findings suggest a less satisfactory performance of the CASPAR criteria when applied in early PsA. Lower sensitivity could mainly depend on the small proportion of patients fulfilling the radiologic criterion.
D'Angelo
Salvatore
S
Rheumatology Department of Lucania, Ospedale San Carlo, Contrada Macchia Romana, 85100 Potenza, Italy.
Mennillo
Gianna Angela
GA
Cutro
Maria Stefania
MS
Leccese
Pietro
P
Nigro
Angelo
A
Padula
Angela
A
Olivieri
Ignazio
I
D000328:Adult; D017668:Age of Onset; D000368:Aged; D015535:Arthritis, Psoriatic / Q000145:classification* / Q000175:diagnosis* / Q000503:physiopathology; D001175:Arthrography / Q000379:methods / Q000592:standards*; D019411:Clinical Laboratory Techniques / Q000379:methods; D003937:Diagnosis, Differential; D018450:Disease Progression; D042241:Early Diagnosis; D005260:Female; D006801:Humans; D007596:Joints / Q000473:pathology* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012217:Rheumatoid Factor / Q000032:analysis / Q000378:metabolism; D012720:Severity of Illness Index; D012867:Skin / Q000276:immunology / Q000473:pathology / Q000503:physiopathology
D012217:Rheumatoid Factor