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Muscle weakness in infants with rickets: distribution, course, and recovery
C F Torres1, G B Forbes, G H Decancq
1Department of Pediatrics, University of Rochester School of Medicine and Dentistry, NY 14642.
Insights
Rickets in infants causes progressive muscle weakness, particularly in the legs, and failure to gain weight. Neuromuscular symptoms resolve over time, with resolution varying based on the specific cause of rickets.
Area of Science:
- Pediatric Endocrinology
- Neuromuscular Disorders
- Skeletal Dysplasias
Background:
- Rickets, a disorder affecting bone mineralization, can present with diverse clinical manifestations.
- Understanding the spectrum of neuromuscular involvement in infantile rickets is crucial for timely diagnosis and management.
Observation:
- Three infants with rickets from different etiologies exhibited progressive muscle weakness, wasting, and hypotonia.
- Proximal leg muscles were preferentially affected, alongside failure to gain weight as initial symptoms.
- Skeletal signs of rickets manifested later, after the onset of neuromuscular deficits.
Findings:
- The distribution and progression of neuromuscular symptoms in infantile rickets are described.
- Resolution timelines for muscle weakness, wasting, and hypotonia varied significantly depending on the underlying cause of rickets.
- Early recognition of neuromuscular symptoms can aid in identifying rickets even before overt skeletal changes.
Implications:
- This study highlights the importance of evaluating neuromuscular function in infants presenting with failure to thrive or weakness.
- Recognizing the varied presentation and resolution patterns of neuromuscular involvement in rickets can guide clinical suspicion and diagnostic workups.
- Tailoring management strategies based on the specific etiology of rickets is essential for optimizing outcomes in affected infants.
Abstract:
We describe the distribution, progression, and resolution of muscle weakness, wasting, and hypotonia in three infants with rickets due to different causes. Progressive muscle weakness affecting preferentially the proximal muscles of the legs and failure to gain weight were the presenting symptoms. The skeletal signs appeared later in the course of the illness and the time for resolution of the neuromuscular findings varied with the etiology of the disorder.