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Mixed connective tissue disease in childhood
1Department of Pediatrics, Yokohama City University School of Medicine, Japan.
Insights
This study analyzes 21 Japanese children with mixed connective tissue disease (MCTD), highlighting early Raynaud's phenomenon and anti-ribonuclear protein (RNP) antibodies. While generally good, severe cardiac or kidney issues can arise, necessitating further research.
Area of Science:
- Pediatric Rheumatology
- Immunology
Background:
- Mixed Connective Tissue Disease (MCTD) in childhood is a rare autoimmune disorder.
- Understanding its clinical spectrum and serological markers is crucial for diagnosis and management.
Purpose of the Study:
- To analyze the clinical features and laboratory findings of 21 children diagnosed with MCTD in Japan.
- To characterize the typical presentation, serology, and prognosis of childhood MCTD.
Main Methods:
- Retrospective analysis of 21 pediatric MCTD cases reported in Japanese literature since 1981.
- Evaluation based on established criteria from the Ministry of Health and Welfare, Japan.
- Review of clinical symptoms, laboratory findings, and serological markers, including anti-ribonuclear protein (RNP) antibody.
Main Results:
- Childhood MCTD often presents with Raynaud's phenomenon, preceded by fever, arthralgia, myalgia, or scleroderma-like skin changes.
- All patients were positive for anti-ribonuclear protein (RNP) antibody and speckled antinuclear antibody.
- Characteristic findings include hypergammaglobulinemia, positive rheumatoid factor, and normocomplementemia.
Conclusions:
- Childhood MCTD generally has a better prognosis than childhood systemic lupus erythematosus, though severe complications like myocarditis or nephrotic syndrome can occur.
- Long-term follow-up and improved anti-ribonucleoprotein antibody detection are needed for better characterization and treatment of pediatric MCTD.
Abstract:
Since 1981, 21 children diagnosed with mixed connective tissue disease (MCTD) have been reported in detail in the literature in Japan. Overlapping clinical features and laboratory findings of these children were analyzed according to the established criteria of the Ministry of Health and Welfare, Japan. Mixed connective tissue disease in childhood typically begins with Raynaud's phenomenon preceded by several months or years with the appearance of other symptoms and signs including fever, arthralgia, myalgia, and/or progressive systemic sclerosis like skin manifestations. Serologically all the children with MCTD were positive for anti-ribonuclear protein (RNP) antibody with speckled-type antinuclear antibody. Hypergammaglobulinemia, positive rheumatoid factor, and normocomplementemia were characteristic. In general, prognosis is considered to be fairly good as opposed to systemic lupus erythematosus in childhood, but severe pericarditis/myocarditis or nephrotic syndrome can occur. Long-term follow-up study and improved laboratory detection of anti-ribonucleoprotein antibodies will be necessary for further characterization of MCTD in childhood, and for the improvement of therapy.