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Vasopressin-Dependent Disorders: What Is New in Children?
Jane E Driano1, Aida N Lteif2, Ana L Creo3
1School of Medicine, Creighton University, Omaha, Nebraska; and.
Insights
Arginine vasopressin (AVP)-mediated disorders like diabetes insipidus (DI) and SIADH are common in children. Recent advances in diagnosis and treatment, including copeptin measurement and new AVP formulations, improve outcomes.
Area of Science:
- Pediatric Endocrinology
- Nephrology
- Internal Medicine
Background:
- Arginine vasopressin (AVP)-mediated disorders are common in pediatric differential diagnoses for hypo- and hypernatremia.
- Diabetes insipidus (DI) and syndrome of inappropriate secretion of antidiuretic hormone (SIADH) require prompt recognition and management.
- These conditions impact children's fluid and electrolyte balance, affecting quality of life.
Purpose of the Study:
- To review recent advancements in the understanding, diagnosis, and treatment of AVP-mediated osmoregulatory disorders in children.
- To highlight novel diagnostic biomarkers and therapeutic strategies for DI and SIADH.
- To discuss the potential impact of new technologies on managing these pediatric conditions.
Main Methods:
- Review of recent literature on pediatric diabetes insipidus and SIADH.
- Discussion of novel diagnostic tools such as copeptin measurement.
- Exploration of updated treatment approaches, including new synthetic AVP formulations and potential therapies for SIADH.
Main Results:
- Copeptin serves as a surrogate biomarker for AVP secretion and aids in DI diagnosis.
- Expanded genotype-phenotype correlations improve prediction of inherited DI clinical course.
- Newer synthetic AVP formulations offer improved pediatric DI treatment options.
- Contemporary methods help differentiate SIADH from other hyponatremic conditions like cerebral salt wasting.
Conclusions:
- Recent developments in pathophysiology, diagnostics, and therapeutics offer improved outcomes for children with DI and SIADH.
- Further research is needed on pediatric SIADH therapies, with potential insights from adult treatments.
- Home point-of-care sodium testing may revolutionize the management of these challenging pediatric disorders.
Abstract:
Arginine vasopressin (AVP)-mediated osmoregulatory disorders, such as diabetes insipidus (DI) and syndrome of inappropriate secretion of antidiuretic hormone (SIADH) are common in the differential diagnosis for children with hypo- and hypernatremia and require timely recognition and treatment. DI is caused by a failure to concentrate urine secondary to impaired production of or response to AVP, resulting in hypernatremia. Newer methods of diagnosing DI include measuring copeptin levels; copeptin is AVP's chaperone protein and serves as a surrogate biomarker of AVP secretion. Intraoperative copeptin levels may also help predict the risk for developing DI after neurosurgical procedures. Copeptin levels hold diagnostic promise in other pediatric conditions, too. Recently, expanded genotype and phenotype correlations in inherited DI disorders have been described and may better predict the clinical course in affected children and infants. Similarly, newer formulations of synthetic AVP may improve pediatric DI treatment. In contrast to DI, SIADH, characterized by inappropriate AVP secretion, commonly leads to severe hyponatremia. Contemporary methods aid clinicians in distinguishing SIADH from other hyponatremic conditions, particularly cerebral salt wasting. Further research on the efficacy of therapies for pediatric SIADH is needed, although some adult treatments hold promise for pediatrics. Lastly, expansion of home point-of-care sodium testing may transform management of SIADH and DI in children. In this article, we review recent developments in the understanding of pathophysiology, diagnostic workup, and treatment of better outcomes and quality of life for children with these challenging disorders.
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