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Early predictors of poor outcome in congenital fiber-type disproportion myopathy
1Department of Neurology, University of Rochester, Medical School. NY.
Insights
Congenital fiber-type disproportion myopathy presents severe early-onset muscle weakness, profound respiratory compromise, and feeding difficulties in children. These clinical signs predict high infant mortality and poor developmental outcomes.
Area of Science:
- Neurology
- Pediatrics
- Muscle Diseases
Background:
- Congenital fiber-type disproportion (CFD) myopathy is a rare neuromuscular disorder.
- Early diagnosis and understanding prognosis are crucial for affected children and families.
Observation:
- Eight pediatric cases of CFD myopathy with characteristic muscle histology were analyzed.
- Five infants presented with severe congenital muscle weakness, respiratory failure, facial/bulbar weakness, ptosis, and ophthalmoparesis.
Findings:
- Infants with severe congenital weakness experienced profound respiratory muscle compromise, requiring mechanical ventilation from infancy.
- Tube feeding and gastrostomy were necessary for 4/5 infants due to feeding difficulties.
- Mortality rate was high, with three deaths occurring in early childhood.
Implications:
- The constellation of severe weakness, respiratory, facial, and bulbar muscle involvement at birth predicts a grave prognosis.
- Survivors face significant disability, requiring ongoing intensive care and support.
- Early identification of these clinical markers is vital for predicting outcomes in congenital myopathies.
Abstract:
We report the cases of eight children with histologic findings in the muscle of congenital fiber-type disproportion myopathy. Five had severe muscle weakness at birth; three of them died at 6 months, 18 months, and 6.5 years of age, respectively, and the other two are ventilator dependent and need total care at 2.5 and 4 years of age. The five children with severe weakness at birth had profound respiratory muscle weakness and needed assisted ventilation since early infancy. They also had severe facial and bulbar muscle weakness that required tube feeding, and four had gastrostomy. Ptosis and marked external ophthalmoparesis were also noted. Our study shows that the presence of the above constellation of signs at birth or in early infancy is a predictor of a high rate of mortality in infancy and poor developmental outcome in the survivors.