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[Forms of polyarthritis in idiopathic juvenile arthritis]
1Services de Rhumatologie et de Pédiatrie, CHU, F 49033 Angers.
Insights
Idiopathic juvenile polyarthritis is an inflammatory condition affecting children under 16. Early diagnosis and multidisciplinary care are crucial for managing this severe, potentially disabling disease.
Area of Science:
- Pediatric Rheumatology
- Immunology
- Autoimmune Diseases
Context:
- Idiopathic juvenile polyarthritis (IJP) is a chronic inflammatory condition in children under 16.
- Diagnosis is by exclusion, differentiating from malignancy and other conditions.
- IJP subtypes include rheumatoid factor (RF)-positive and RF-negative polyarthritis, and extended oligoarthritis.
Purpose:
- To define and differentiate subtypes of idiopathic juvenile polyarthritis.
- To highlight key clinical features, diagnostic considerations, and management strategies.
- To emphasize the need for specialized care in managing this severe childhood disease.
Summary:
- RF-negative polyarthritis, particularly antinuclear antibody (ANA)-positive, often presents early in girls with insidious joint involvement and frequent uveitis.
- ANA-positive polyarthritis can lead to joint destruction and growth issues, requiring prompt management.
- RF-positive polyarthritis is rare, typically occurring in young girls.
Impact:
- Early identification and management of IJP subtypes can mitigate long-term joint damage and growth disturbances.
- Systematic screening for complications like uveitis is essential for preserving vision.
- Multidisciplinary care is vital for addressing the complex needs of children with IJP.
Definition:
Idiopathic juvenile polyarthritis includes a group of inflammatory diseases that affect at least five joints, either from onset or within the first six months of the disease course in children under 16 years of age. Diagnosis is arrived at by elimination. Besides malignant disease, always to be considered as a differential diagnosis, idiopathic juvenile polyarthritis can be divided into rheumatoid factor (RF)-positive and RF-negative polyarthritis and extended forms of oligoarthritis. RF-NEGATIVE POLYARTHRITIS: Antinuclear antibody (ANA)-positive polyarthritis must be distinguished from extended forms of oligoarthritis which are also ANA-positive. ANA-positive polyarthritis generally begins early, at the age of 2 or 3 years, predominantly in girls. Characteristic torpid uveitis is frequent, requiring regular systematic screening. Joints are minimally painful with symmetrical involvement, usually of the knees and wrists. Progressive joint destruction and/or growth disorders are common. The disease progresses by acute episodes. Nonsteroidal antiinflammatory drugs are used, associated with a specific treatment and local care as needed. General corticosteroids may be required in certain cases but should be avoided if possible.
Seronegative Forms:
Certain patients have no detectable antibodies. These patients generally have fewer ocular problems and less severe joint disease. The treatment is the same as in ANA-positive forms. RF-positive polyarthritis: RF-positive polyarthritis is exceptional and occurs early in young girls.
Specialized Care:
Irrespective of the type of disease, all children with idiopathic juvenile polyarthritis require multidisciplinary specialized care for their chronic and severe, potentially invalidating disease.