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Sodium chloride restriction and extracellular fluid volume contraction in hyperphosphatiuric vitamin D resistant
Insights
Lowe syndrome treatment was challenging, but dietary sodium restriction effectively managed severe phosphate wasting and rickets in an infant. This intervention corrected metabolic abnormalities and improved bone health.
Area of Science:
- Biochemistry
- Pediatrics
- Nephrology
Background:
- Lowe syndrome is a rare genetic disorder affecting multiple systems.
- Key features include congenital cataracts, intellectual disability, and renal dysfunction.
- Renal involvement often manifests as a proximal renal tubulopathy.
Observation:
- A patient diagnosed with Lowe syndrome exhibited progressive hyperchloraemic renal tubular acidosis from infancy.
- The patient presented with hypophosphataemia, hyperphosphaturia, and generalized hyperaminoaciduria.
- Standard treatments including vitamin D, alkali, and high phosphate intake were ineffective.
Findings:
- Dietary sodium restriction led to a contraction of extracellular fluid volume.
- This intervention successfully corrected the metabolic acidosis, hypophosphataemia, and hyperaminoaciduria.
- Hyperphosphaturia normalized, and rickets showed signs of healing.
Implications:
- Dietary sodium restriction represents a novel therapeutic approach for managing phosphate diabetes in Lowe syndrome.
- Understanding fluid volume's role is crucial for treating renal tubular acidosis.
- This case highlights the importance of individualized treatment strategies for rare genetic disorders.
Abstract:
A patient with a Lowe syndrome was observed from birth. Progressive hyperchloraemic renal tubular acidosis, hypophosphataemia, hyperphosphaturia and generalized hyperaminoaciduria had developed in infancy. Supplementary vitamin D, alkali and a high intake of dietary phosphate were unsuccessful in controlling the severe phosphate diabetes and rickets. Contraction of the extracellular fluid volume by dietary sodium restriction resulted in correction of the acidosis, hypophosphataemia, hyperaminoaciduria, and hyperphosphaturia, and healing of the rickets.