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Updated: May 24, 2026

Measurements of Motor Function and Other Clinical Outcome Parameters in Ambulant Children with Duchenne Muscular Dystrophy
Published on: January 12, 2019
Mental retardation in Duchenne muscular dystrophy
Flávia Nardes1, Alexandra P Q C Araújo, Márcia Gonçalves Ribeiro
1Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil. flavianardes@bol.com.br
Cognitive dysfunction in Duchenne muscular dystrophy (DMD) is linked to developmental delays and lower IQ scores, particularly in verbal abilities. Greater cognitive impairment correlates with increased disease severity and mortality risk.
Area of Science:
- Neurology
- Genetics
- Developmental Pediatrics
Background:
- Duchenne muscular dystrophy (DMD) is a progressive genetic disorder affecting muscle function.
- Cognitive dysfunction is an under-recognized aspect of DMD, impacting patient outcomes.
- Neurological development and intelligence are crucial in understanding DMD's full spectrum.
Purpose of the Study:
- To review the medical literature on cognitive dysfunction in Duchenne muscular dystrophy.
- To describe neurological development milestones in DMD patients.
- To outline psychometric tests used for intelligence assessment in DMD.
Main Methods:
- A non-systematic literature review was conducted.
- Searches included major medical databases: MEDLINE, LILACS, SciELO, and Cochrane Library.
- The review focused on cognitive aspects within Duchenne muscular dystrophy.
Main Results:
- Duchenne muscular dystrophy patients showed delayed walking and language development.
- These developmental delays correlated with lower scores on intelligence tests.
- Significant impairment was observed in verbal subtests of cognitive assessments.
Conclusions:
- Average IQ scores in DMD patients fall below the general population's average.
- Increased cognitive impairment is associated with poorer prognosis regarding morbidity and mortality.
- Early identification and management of cognitive issues are vital in DMD care.
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