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Refractory Rickets.

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Refractory rickets, often resistant to standard vitamin D and calcium treatment, requires careful diagnosis. This review explores causes of persistent rickets, focusing on phosphate regulation by hormones like PTH and FGF23.

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Area of Science:

  • Pediatrics
  • Endocrinology
  • Nephrology

Background:

  • Nutritional rickets, due to vitamin D/calcium deficiency, is common, especially in resource-limited areas.
  • Refractory rickets necessitates considering alternative diagnoses when standard treatment fails or a family history exists.
  • Chronic hypophosphatemia, a hallmark of all rickets types, impairs growth plate mineralization.

Purpose of the Study:

  • To provide an approach to the differential diagnosis of refractory rickets.
  • To outline management strategies for refractory rickets.
  • To elucidate the role of phosphate-regulating hormones and renal tubulopathies in rickets.

Main Methods:

  • Review of literature on refractory rickets.
  • Discussion of the pathophysiology of hypophosphatemia in various rickets forms.
  • Analysis of hormonal (PTH, FGF23) and renal mechanisms affecting phosphate homeostasis.

Main Results:

  • Nutritional rickets is the most frequent cause, but refractory cases suggest other etiologies.
  • Elevated PTH (nutritional rickets, VDDRs) or FGF23, and renal phosphate wasting cause hypophosphatemia and rickets.
  • Understanding these mechanisms is crucial for diagnosing and managing refractory rickets.

Conclusions:

  • Refractory rickets requires a differential diagnosis beyond nutritional deficiencies.
  • Disorders of phosphate metabolism, involving PTH, FGF23, and renal tubular function, are key considerations.
  • A systematic approach aids in identifying and treating complex cases of rickets.