Approach to a Child with Hypophosphatemia
Agnieszka Antonowicz1, Patryk Lipiński2, Michał Popow3
1Department of Pediatrics and Nephrology, Medical University of Warsaw, 02-091 Warsaw, Poland.
Insights
Hypophosphatemia in children, a rare disorder, can cause severe bone issues. Identifying the cause of phosphate deficiency is crucial for effective treatment and management.
Area of Science:
- Pediatric Endocrinology
- Mineral Metabolism
- Renal Disorders
Background:
- Hypophosphatemia is a rare pediatric ion disorder with significant risks to high-energy tissues, particularly bone.
- Understanding phosphate metabolism is key to managing this condition.
Purpose of the Study:
- To review phosphate metabolism, clinical features, and diagnostic approaches for hypophosphatemia in children.
- To analyze extra-renal and renal causes of hypophosphatemia, detailing renal subtypes.
Main Methods:
- Discussion of phosphate metabolism and clinical manifestations.
- Analysis of diagnostic tests for hypophosphatemia.
- Categorization of renal hypophosphatemia based on underlying mechanisms (PTH-dependent, FGF23-dependent, intrinsic renal).
Main Results:
- Renal hypophosphatemia is classified into PTH-dependent, FGF23-dependent (e.g., X-linked hypophosphatemia), and intrinsic renal forms (e.g., Fanconi syndrome).
- Treatment involves phosphate repletion, often with vitamin D, and addressing the underlying cause.
- Burosumab shows efficacy in FGF23-dependent hypophosphatemia.
Conclusions:
- Effective management of pediatric hypophosphatemia necessitates a multidisciplinary approach.
- Determining the specific mechanism of phosphate deficiency is essential for targeted therapy.
Abstract:
Hypophosphatemia is a rare ion disorder in children, but it carries the risk of serious clinical sequelae in tissues and organs with high energy requirements, such as bone tissue. This article discusses the metabolism of phosphate in the body, the clinical manifestations of hypophosphatemia, and the diagnostic tests necessary in patients with this disorder. Extra-renal causes are analyzed, and renal forms of hypophosphatemia are discussed in detail. Renal hypophosphatemia, depending on the mechanism, is divided into PTH-dependent (e.g., primary hyperparathyroidism), FGF23-dependent (e.g., X-linked hypophosphatemia), and intrinsic renal hypophosphatemia (e.g., Fanconi syndrome). The treatment of hypophosphatemia involves compensating for phosphate deficiency, often simultaneously with the supply of an active form of vitamin D. Always seek causal treatment, such as parathyroidectomy in primary hyperparathyroidism. In the FGF-23-dependent forms of X-linked hypophosphatemia and tumor-induced osteomalacia, burosumab has proven to be an effective and safe drug. Conclusions: a child with hypophosphatemia requires a multidisciplinary approach and determination of the mechanism of phosphate deficiency in the body.
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