Comprehensive Overview of Hypernatremia: Pathophysiology, Diagnosis, and Management

Hypernatremia, defined as an elevated serum sodium concentration, is a critical electrolyte imbalance with significant neurological and systemic effects. Effective management hinges on understanding the condition's underlying aetiology, such as dehydration, excessive sodium intake, or impaired renal water handling. The approach to treatment varies by onset and severity: acute hypernatremia (<48 hours) necessitates rapid but controlled correction to prevent complications like vascular rupture or cerebral bleeding, while chronic hypernatremia (≥48 hours) requires gradual intervention to mitigate the risk of cerebral edema. Treatment focuses on restoring water balance through intravenous fluids (typically hypotonic solutions) while monitoring serum sodium levels to prevent overcorrection. Identifying and addressing associated conditions, such as diabetes insipidus (DI) or volume depletion, is crucial. Advances in the understanding of pathophysiology have informed clinical guidelines, emphasizing personalized care based on patient-specific factors, such as age, comorbidities, and the underlying cause of hypernatremia. Despite improvements in treatment protocols, challenges remain in managing hypernatremia in critically ill patients, where both rapid and excessively slow corrections are associated with increased mortality. Further research is needed to refine management strategies, develop predictive biomarkers for better risk assessment, and optimize outcomes in diverse patient populations. This review highlights the importance of a multidisciplinary approach in diagnosing, treating, and preventing complications of hypernatremia, ensuring safer and more effective care delivery.