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[Duchenne muscular dystrophy. Review of 37 cases]
Insights
Duchenne Muscular Dystrophy often presents with delayed motor development in young males. Electromyography (EMG) reveals characteristic changes in Motor Unit Potentials, with frequent alterations also seen in female relatives.
Area of Science:
- Neurology
- Pediatrics
- Clinical Electrophysiology
Context:
- Duchenne Muscular Dystrophy (DMD) is a severe genetic disorder affecting males.
- Early diagnosis and understanding of disease progression are crucial for management.
- This study focuses on clinical and electromyographical findings in young DMD patients.
Purpose:
- To present clinical, analytical, and electromyographical findings in a cohort of 37 males with Duchenne Muscular Dystrophy.
- To analyze the relationship between age, clinical severity, and serum muscular enzyme levels.
- To investigate electromyographical alterations in female relatives of affected individuals.
Summary:
- Motor development retardation, particularly delayed sitting and walking, is a common early sign.
- Clinical features align with existing literature; serum enzyme levels do not correlate with age or clinical severity.
- Electromyography (EMG) frequently showed increased polyphasia and late components in Motor Unit Potentials (MUPs); 97% of female relatives exhibited EMG alterations.
Impact:
- Highlights the diagnostic utility of EMG in Duchenne Muscular Dystrophy.
- Provides insights into the potential subclinical involvement in female carriers.
- Contributes to the understanding of the clinical spectrum and diagnostic markers for DMD.
Abstract:
Clinical, analytical, histological and electromyographical findings observed in 37 males with Duchenne's Muscular Dystrophy are presented. Ages were between 14 months and 10 years. Follow-up of 18 patients was made. Motor development retardation is very often the first sign of the disease. 32% of the children did not get the sitting position before 8 months old. 86% walked after 14 months. Clinical alterations are similar to that reported in the literature. Serum muscular enzymes levels don't decrease with age during the first ten years of life, and they aren't in proportion with the severity of clinical disturbances. The most frequent findings in EMG were increase of polyphasia and presence of late components in Motor Unit Potentials (MUP). Decrease of duration of MUP was found only in 50% of studied children. Mothers and other females belonging to families of 17 children were studied; EMG alterations in 97% of females studied were observed. Healthy people controls with EMG were not made. Analytical and EMG findings in these relatives are commented.