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[Hypocalcemic vitamin D-dependent renal rickets].
Boletin Medico Del Hospital Infantil De Mexico
|November 1, 1976
Summary
Vitamin D-dependent rickets, a genetic disorder, causes severe bone and mineral imbalances. Treatment with dihydrotaquisterol effectively resolved symptoms in affected siblings.
Area of Science:
- Pediatric Endocrinology
- Metabolic Bone Disease
- Genetics
Background:
- Vitamin D-dependent rickets (VDDR) is a rare genetic disorder.
- It stems from a defect in vitamin D metabolism, specifically the enzyme 25-hydroxy-D1-hydroxylase.
- This defect prevents the formation of the active vitamin D metabolite, 1,25-dihydroxycholecalciferol.
Observation:
- Two siblings with VDDR presented with persistent rachitic manifestations since infancy.
- Biochemical analysis revealed severe hypocalcemia, moderate hypophosphatemia, and elevated alkaline phosphatase.
- Diminished renal tubular reabsorption of amino acids and phosphates was noted, reversible with IV calcium gluconate.
Findings:
- Patients with VDDR exhibited characteristic biochemical and clinical features of rickets.
- Despite high-dose vitamin D, symptoms persisted, indicating a metabolic defect rather than simple deficiency.
- Successful treatment with dihydrotaquisterol normalized clinical, biochemical, and radiological findings within one year.
Implications:
- Dihydrotaquisterol represents an effective therapeutic agent for vitamin D-dependent rickets.
- Understanding the specific enzymatic defect is crucial for targeted treatment strategies.
- Early diagnosis and intervention are vital to prevent severe complications in children with VDDR.