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[Juvenile dermatomyositis: clinical manifestations and laboratory tests]
1Unidad de Reumatología, Hospital San Juan de Dios, Universidad de Chile.
Insights
Juvenile dermatomyositis (JDM) is a rare autoimmune disease affecting children. This study shows that most children with JDM experience favorable outcomes with treatment, including prednisone and rehabilitation.
Area of Science:
- Rheumatology
- Pediatrics
- Dermatology
Context:
- Juvenile dermatomyositis (JDM) is a chronic inflammatory disease impacting skin and muscles.
- This study retrospectively analyzed 10 pediatric JDM cases over 14 years in Chile.
Purpose:
- To describe the clinical features, laboratory findings, and treatment outcomes in children with JDM.
- To evaluate the long-term prognosis and sequelae of JDM in a pediatric cohort.
Summary:
- All 10 patients presented with characteristic skin and muscle involvement, including heliotrope erythema.
- Elevated muscle enzymes (especially LDH) and abnormal EMG/muscle biopsy findings were common.
- Treatment involved prednisone, rehabilitation, and sometimes cytotoxic drugs, leading to favorable outcomes in 90% of cases.
Impact:
- Demonstrates the effectiveness of current treatment protocols for JDM, leading to remission and minimal sequelae in most pediatric patients.
- Highlights the importance of early diagnosis and consistent management for improving long-term prognosis in JDM.
- Provides valuable data for understanding the natural history and treatment response of JDM in a South American pediatric population.
Abstract:
Juvenile dermatomyositis (JDM) is a chronic, inflammatory degenerative entity with multisystemic involvement, particularly of skin and striated muscle. This is a description of the clinical features, laboratory findings and treatment results in 10 children with JDM which were under control along a 14 years period (1974-1988) in a general hospital at metropolitan Santiago, Chile. Onset was insidious in 8 cases and acute in the remaining patients. All children had muscle and skin involvement, 90% of them showed heliotrops erythema and 6 cases (among the total 10) had one or more additional skin signs. Ninety percent of patients had risen serum activity of muscle associated enzymes, lactic dehydrogenase (LDH) being the most constantly elevated: 7/7 studied cases. All patients showed abnormal electromyographic and histologic findings in muscle biopsy. Treatment was based upon rehabilitation, prednisone (average daily dose: 1.5 mg.kg of body weight) associated or not with cytotoxic drugs, accordingly to each individual case. Clinical course was considered to be favourable in 9 of the 10 cases because all of them showed no evidence of disease activity on last follow up control 26 to 93 months after initial consultation, six had only slight restriction to wider range movements of affected joints and three showed no sequelae. Only one death occurred in this series, to a patient who rejected treatment.