[Hypernatremia: a matter of water]

Area of Science:

• Endocrinology
• Nephrology
• Internal Medicine

Context:

• Hypernatremia is a frequent electrolyte imbalance, particularly in vulnerable populations like neonates and geriatric patients.
• Hospitalization is identified as a significant risk factor for the development of hypernatremia.
• The condition is primarily caused by a free water deficit, leading to hyperosmolality and cellular dehydration.

Purpose:

• To provide a concise overview of hypernatremia, covering its definition, causes, clinical presentation, diagnosis, and management.
• To highlight the neurological manifestations and diagnostic requirements for hypernatremia.
• To emphasize the association of hypernatremia with significant mortality and morbidity.

Summary:

• Hypernatremia is defined by serum sodium concentrations above 145 mmol/l, commonly resulting from free water deficit.
• Clinical signs are predominantly neurological but non-specific, necessitating laboratory confirmation via blood analysis.
• Effective treatment involves addressing the root cause and managing the volume deficit.

Impact:

• Understanding hypernatremia is crucial for healthcare providers managing at-risk patient populations.
• Prompt diagnosis and appropriate treatment can reduce the high morbidity and mortality associated with hypernatremia.
• This review serves as a foundational resource for clinicians encountering this common electrolyte disorder.