Hypernatremia is a common electrolyte problem that is defined as a rise in serum sodium concentration to a value exceeding 145 mmol/L. ] It is strictly defined as a hyperosmolar condition caused by a decrease in total body water (TBW) relative to electrolyte content. Hypernatremia is a “water problem,” not a problem of sodium homeostasis. Community-acquired hypernatremia generally occurs in elderly people who are mentally and physically impaired, often with an acute infection. Patients who develop
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