cliot (version 1.0.0)

caspar_psoriatic_arthritis: CASPAR Criteria for Psoriatic Arthritis

Description

Calculates the CASPAR (ClASsification criteria for Psoriatic ARthritis) score. These criteria are intended for patients with inflammatory articular disease (joint, spine, or entheseal). A score of 3 or greater has high sensitivity (91.4%) and specificity (98.7%) for the diagnosis of Psoriatic Arthritis.

Usage

caspar_psoriatic_arthritis(inflammatory_disease_present, current_psoriasis,
                           personal_history_psoriasis, family_history_psoriasis,
                           nail_dystrophy, negative_rf, dactylitis,
                           juxta_articular_bone_formation)

Value

A list containing:

Total_Score

The calculated CASPAR score (Range 0-6).

Classification

"Classified as Psoriatic Arthritis" if Score >= 3, otherwise "Not Classified".

Arguments

inflammatory_disease_present

Numeric (0 or 1). Entry Criterion: Does the patient have inflammatory articular disease (joint, spine, or entheseal)? (1 = Yes).

current_psoriasis

Numeric (0 or 1). Current psoriatic skin or scalp disease present as judged by a rheumatologist or dermatologist. (1 = Yes, +2 points).

personal_history_psoriasis

Numeric (0 or 1). A history of psoriasis that may be obtained from patient, family physician, dermatologist, rheumatologist, or other qualified health care provider. (1 = Yes, +1 point). Note: Only scored if Current Psoriasis is No.

family_history_psoriasis

Numeric (0 or 1). A history of psoriasis in a first- or second-degree relative according to patient report. (1 = Yes, +1 point). Note: Only scored if Current and Personal History are No.

nail_dystrophy

Numeric (0 or 1). Typical psoriatic nail dystrophy including onycholysis, pitting, and hyperkeratosis observed on current physical examination. (1 = Yes, +1 point).

negative_rf

Numeric (0 or 1). A negative test for rheumatoid factor by any method except latex but preferably by ELISA or nephelometry. (1 = Yes, +1 point).

dactylitis

Numeric (0 or 1). Swelling of an entire digit (dactylitis); present or recorded by a rheumatologist. (1 = Yes, +1 point).

juxta_articular_bone_formation

Numeric (0 or 1). Ill-defined ossification near joint margins (excluding osteophyte formation) on plain radiographs of hand or foot. (1 = Yes, +1 point).

References

Taylor W, Gladman D, Helliwell P, et al. Classification criteria for psoriatic arthritis: development of new criteria from a large international study. Arthritis Rheum. 2006;54(8):2665-2673. doi:10.1002/art.21972

Examples

# Example 1: Classified as PsA
# Inflammatory disease present, Current Psoriasis (+2), Nail Dystrophy (+1)
# Score = 3
caspar_psoriatic_arthritis(1, 1, 0, 0, 1, 0, 0, 0)

# Example 2: Not Classified
# Inflammatory disease present, Family Hx (+1), Negative RF (+1)
# Score = 2
caspar_psoriatic_arthritis(1, 0, 0, 1, 0, 1, 0, 0)