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Pediatric dermatomyositis and polymyositis cases show good prognosis with corticosteroid treatment. Early diagnosis using muscle weakness and skin rash is key, though lab tests can be normal.
Area of Science:
- Pediatric Rheumatology
- Pediatric Dermatology
- Neuromuscular Disorders
Background:
- Dermatomyositis and polymyositis are rare inflammatory myopathies affecting children.
- Understanding the clinical presentation and treatment outcomes is crucial for pediatric care.
Observation:
- A review of sixteen pediatric cases (15 dermatomyositis, 1 polymyositis) was conducted.
- Proximal muscle weakness and characteristic skin rash were primary diagnostic indicators.
- Laboratory tests like creatine phosphokinase (CPK), electromyography (EMG), and muscle biopsy aided diagnosis but were not always definitive, even in acute phases.
Findings:
- Most children received high-dose corticosteroids initially, followed by long-term low-dose maintenance.
- Two patients also received cytotoxic agents.
- Thirteen of sixteen patients achieved remission.
- One case of polymyositis remained active, and two dermatomyositis cases were fatal.
- Only three patients experienced long-term disability from contractures and calcinosis.
Implications:
- The study suggests a generally favorable prognosis for childhood dermatomyositis with appropriate treatment.
- Prompt diagnosis and management are essential to improve outcomes and minimize long-term complications.
- Further research may explore optimal treatment strategies and predictors of prognosis in pediatric inflammatory myopathies.
Abstract:
Sixteen cases of dermatomyositis-polymyositis in children (dermatomyositis 15; polymyositis 1) have been reviewed. Proximal muscle weakness with a characteristic skin rash was vital for diagnosis in the majority of children. The positive laboratory tests such as creatine phosphokinase (CPK), electromyography (EMG) and muscle biopsy were helpful but results were normal in some cases even in the acute phase of the illness. All but one had been treated initially with high dose corticosteroids followed by a low dose maintenance for a prolonged period. Two in addition had had cytotoxic agents. Thirteen of the sixteen were currently in remission. In the other three cases, one with polymyositis only, the disease remained active and the two with dermatomyositis died. Only three of the patients were incapacitated by residual fixed contractures and extruding calcinosis. On the whole the prognosis of dermatomyositis is good.