Nephrology Treatment of hypernatremia

**Management of Hypernatremia in Children: A Contemporary Perspective** Hypernatremia, defined as a serum sodium level above ۱۴۵-۱۵۰ mmol/L, poses significant risks in pediatric patients, particularly infants and those with limited access to fluids ([Royal Children's Hospital][۱], [Medscape] [۲]). In children, it is frequently hospital-acquired and arises from insufficient free-water availability, gastrointestinal losses, or underlying illnesses ([Medscape] [۲], [Royal Children's Hospital][۱]). **Initial Stabilization:** Immediate resuscitation with isotonic fluids (e.g., ۰.۹% NaCl) is crucial for restoring circulating volume and perfusion ([BioMed Central] [۳], [Medscape] [۴]). Once hemodynamic stability is achieved, the correction of hypernatremia must proceed cautiously to avoid cerebral edema and neurological sequelae ([NCBI][۵], [Royal Children's Hospital][۱], [BioMed Central][۳]). **Calculating Water Deficit:** Estimation of free-water deficit is typically based on total body water (~۶۰% of body weight in children) and the serum sodium target (~۱۴۵ mEq/L), using established formulas ([Medscape][۴], [NCBI][۵]). **Fluid Strategies and Correction Rate:** Fluid choice depends on the scenario: * Hypotonic fluids (e.g., ۰.۴۵% or ۰.۲% NaCl or dextrose-containing solutions) are preferred for gradual sodium reduction ([Medscape] [۴], [BioMed Central] [۳]). * In cases of sodium overload, sodium-free solutions such as ۵% dextrose or loop diuretics may be indicated ([Medscape][۴]). Historically, guidelines have recommended limiting sodium reduction to less than ۰.۵ mEq/L per hour or ۱۰-۱۲ mEq/L per day to minimize cerebral edema risk ([Royal Children's Hospital][۱], [Medscape][۴], [NCBI] [۵]). Close monitoring of sodium levels every ۲-۴ hours is advised ([NCBI][۵], [Royal Children's Hospital][۱]). **Emerging Evidence on Correction Speed:** A large, recent retrospective cohort study from a pediatric center in Melbourne examined ۳۵۸ children (۴۰۲ hypernatremia episodes). It found that more rapid correction (۰.۵ mmol/L per hour) was not associated with increased neurological complications, cerebral edema, seizures, or mortality. Interestingly, slower correction was linked to longer hospital stays ([PMC][۶], [PubMed][۷], [Lippincott Journals] [۸]). **Special Population - Neonates:** In neonates with significant hypernatremic dehydration (e.g., serum sodium ۱۵۰ mEq/L), a prospective observational study (۲۰۲۵) implemented a standardized protocol using saline resuscitation followed by maintenance fluids tailored to the sodium level. Time to normalization varied by severity, ranging from under ۴۸ hours to up to ۶ days; neurological outcomes were favorable with only one seizure reported, and normal development after follow-up ([Brieflands][۹]). **Conclusion:** In pediatric hypernatremia, management must balance careful correction of sodium with restoration of volume. Traditional guidance advocates slow correction, but recent evidence suggests that