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Approach to Hypophosphatemic Rickets
1Department of Medicine, Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
Insights
Hypophosphatemic rickets, often genetic, causes lifelong bone issues. Evaluation involves assessing phosphate metabolism, FGF23, and genetic factors for tailored treatments like vitamin D, phosphate salts, or burosumab.
Area of Science:
- Pediatric Endocrinology
- Metabolic Bone Disease
- Genetics
Background:
- Hypophosphatemic rickets presents with skeletal deformities and growth plate abnormalities in early life.
- Genetic causes, like X-linked hypophosphatemia, lead to persistent hypophosphatemia and osteomalacia.
- Understanding phosphate metabolism, including fibroblast growth factor 23 (FGF23) and 1,25-dihydroxyvitamin-D (1,25(OH)2D), is key for diagnosis and treatment.
Purpose of the Study:
- To outline the diagnostic approach for hypophosphatemic rickets.
- To discuss various treatment strategies based on the underlying etiology.
- To emphasize the importance of serum phosphorus measurement in suspected rickets or osteomalacia.
Main Methods:
- Comprehensive clinical evaluation including history, physical examination, and laboratory investigations.
- Measurement of serum phosphorus levels.
- Genetic analysis for inherited forms and imaging for severity assessment.
Main Results:
- Diagnosis relies on a combination of clinical findings, biochemical tests, genetic analysis, and imaging.
- Treatment is etiology-dependent, ranging from vitamin D and phosphate supplementation to targeted therapies like burosumab for X-linked hypophosphatemia.
Conclusions:
- Accurate diagnosis of hypophosphatemic rickets requires a multi-faceted approach.
- Personalized treatment strategies are essential for managing this condition and improving patient outcomes.
- Further research into phosphate metabolism and FGF23 regulation can refine therapeutic interventions.
Abstract:
Hypophosphatemic rickets typically presents in infancy or early childhood with skeletal deformities and growth plate abnormalities. The most common causes are genetic (such as X-linked hypophosphatemia), and these typically will result in lifelong hypophosphatemia and osteomalacia. Knowledge of phosphate metabolism, including the effects of fibroblast growth factor 23 (FGF23) (an osteocyte produced hormone that downregulates renal phosphate reabsorption and 1,25-dihydroxyvitamin-D (1,25(OH)2D) production), is critical to determining the underlying genetic or acquired causes of hypophosphatemia and to facilitate appropriate treatment. Serum phosphorus should be measured in any child or adult with musculoskeletal complaints suggesting rickets or osteomalacia. Clinical evaluation incudes thorough history, physical examination, laboratory investigations, genetic analysis (especially in the absence of a guiding family history), and imaging to establish etiology and to monitor severity and treatment course. The treatment depends on the underlying cause, but often includes active forms of vitamin D combined with phosphate salts, or anti-FGF23 antibody treatment (burosumab) for X-linked hypophosphatemia. The purpose of this article is to explore the approach to evaluating hypophosphatemic rickets and its treatment options.
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