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Infantile muscle phosphorylase-b-kinase deficiency. A case report
G Sahin1, T Güngör, W Rettwitz-Volk
1Department of Paediatrics, University Children's Hospital Frankfurt, University Children's Hospital, Munich, Germany.
Insights
Muscle phosphorylase-b-kinase deficiency is a rare cause of severe floppy infant syndrome and respiratory failure. This condition, characterized by muscle weakness and breathing difficulties, should be considered in neonates presenting with these symptoms.
Area of Science:
- Biochemistry
- Pediatric Neurology
- Genetics
Background:
- Floppy infant syndrome presents a diagnostic challenge in neonatology.
- Respiratory failure in newborns necessitates prompt etiological investigation.
Observation:
- A Turkish infant exhibited severe hypotonia and respiratory distress at birth.
- The infant experienced recurrent respiratory infections, requiring mechanical ventilation for hypercapnia due to bradypnea.
Findings:
- Skeletal muscle biochemical analysis showed elevated glycogen levels.
- Enzymatic assays confirmed a deficiency in muscle phosphorylase-b-kinase.
Implications:
- Isolated muscle phosphorylase-b-kinase deficiency is a critical diagnosis to consider in infants with severe hypotonia and respiratory compromise.
- Early recognition may guide further research into potential therapeutic strategies for this rare metabolic myopathy.
Abstract:
A Turkish girl is described who showed a severe floppy infant syndrome and respiratory failure at birth. She suffered upper respiratory tract infections and pneumonia. She was ventilated and had hypercapnoea secondary to bradypnoea. Biochemical analysis of skeletal muscle revealed a slightly increased glycogen content, and enzymatic analysis revealed a muscle phosphorylase-b-kinase deficiency. The infant succumbed after 140 days due to persistent apnoea and asystole. Isolated muscle phosphorylase-b-kinase deficiency should be considered as a possible diagnosis in floppy infants.