Related Experiment Videos
Polymyositis and dermatomyositis in children: an epidemiologic and clinical comparative analysis
Insights
This study compared childhood polymyositis (PM) and dermatomyositis (DM), finding DM had more severe muscle and skin symptoms. Juvenile PM is distinct and responds well to steroids.
Area of Science:
- Pediatrics
- Rheumatology
- Neurology
Background:
- Polymyositis (PM) and dermatomyositis (DM) are rare idiopathic inflammatory myopathies.
- Distinguishing between PM and DM in children is crucial for appropriate management.
- Previous studies have not fully delineated their pediatric features.
Purpose of the Study:
- To compare the clinical, laboratory, and epidemiologic characteristics of childhood polymyositis and dermatomyositis.
- To identify key differences between juvenile PM and DM.
- To highlight the distinct nature of juvenile PM.
Main Methods:
- Retrospective review of medical records from 19 hospitals in Memphis and Shelby County, Tennessee.
- Data collection spanned a 25-year period (1948-1972).
- Inclusion criteria involved documented cases of PM and DM in children.
Main Results:
- 17 cases of PM and 26 cases of DM were identified.
- PM diagnosis was not made before 1962; DM was diagnosed throughout the study period.
- DM presented with more acute and severe muscle involvement and characteristic cutaneous manifestations compared to PM.
- A female predominance was noted in the PM group and in adolescents (10-19 years).
Conclusions:
- Juvenile polymyositis is a distinct entity.
- Dermatomyositis in children is characterized by more severe myopathy and skin involvement.
- Early differentiation is important due to the favorable response of juvenile PM to corticosteroid therapy.
Abstract:
In an attempt to delineate and compare the clinical, laboratory and epidemiologic features of polymyositis (PM) and dermatomyositis (DM) in children, the records of all 19 hospitals in Memphis and Shelby County, Tennessee, were surveyed over the 25-year period, 1948-1972. Seventeen documented cases of PM and 26 of DM were identified over the total period. PM was not diagnosed prior to 1962, while DM was found throughout the study. A significant female excess was observed in the PM group and in the combined patients 10-19 years of age. The only major differences found between PM and DM were the more acute and severe muscle involvement in DM and its cutaneous manifestations. Juvenile PM is a definite entity which should be differentiated from other myopathies because of its favourable response to corticosteroid therapy.