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Familial primary hypomagnesemia complicated with brain atrophy and cardiomyopathy
1Department of Pediatrics, Taichung Veterans General Hospital, Taiwan, R.O.C.
Insights
Severe hypomagnesemia can cause refractory seizures and developmental issues in children. Early oral magnesium supplementation can reverse symptoms, though some neurological deficits may persist.
Area of Science:
- Pediatric Neurology
- Metabolic Disorders
- Genetics
Background:
- This study investigates a rare pediatric case presenting with refractory seizures, psychomotor regression, hypoparathyroidism, and cardiomyopathy.
- The patient exhibited severe hypomagnesemia, necessitating a thorough investigation into its underlying cause and management strategies.
Observation:
- A 2-year-old boy presented with recurrent generalized seizures and developmental delay, alongside hypocalcemia, hypomagnesemia, hypoparathyroidism, cardiomyopathy, and brain atrophy.
- Exclusion of renal magnesium wasting, malabsorption, or inadequate intake pointed towards a primary metabolic defect.
- His younger sister presented similarly with isolated hypomagnesemia and seizures at 4 months of age.
Findings:
- Successful treatment with oral magnesium supplements led to dramatic developmental progress in the boy, with resolution of hypoparathyroidism and cardiomyopathy.
- Despite treatment, the boy experienced persistent intermittent seizures and psychomotor retardation.
- The sister's seizures resolved completely with oral magnesium, and she exhibited normal development.
Implications:
- This case highlights the critical role of magnesium in pediatric neurological and cardiac function.
- Early diagnosis and intervention with oral magnesium are crucial for managing severe hypomagnesemia and its associated complications.
- The differing outcomes suggest potential genetic factors influencing disease severity and long-term prognosis.
Abstract:
A 2 5/12-year-old Chinese boy was investigated for refractory seizures and psychomotor regression. His birth history was unremarkable. Generalized seizures occurred at 2 weeks of age with hypocalcemia. They recurred at 7 months of age and have become aggravated since. During hospitalization, in addition to hypocalcemia and hypomagnesemia, he was found to have hypoparathyroidism, cardiomyopathy, and brain atrophy. Excessive renal loss of magnesium, general intestinal malabsorption, or inadequate dietary intake of magnesium were excluded. He was successfully treated with oral supplements of 19-25 mmole/day of magnesium. Over a few months, he made a dramatic progress in development. His hypoparathyroidism and cardiomyopathy gradually resolved. However, intermittent seizures and psychomotor retardation persisted up to his present age of 6 3/12 years. At 4 months of age his younger sister also developed seizures and was found to have isolated hypomagnesemia. This was corrected by oral magnesium and followed by resolution of the seizure. She has developed normally up to her present age of 1 10/12 years. Both patients are currently maintained on oral magnesium oxide.