What is the most common cause of hyponatremia following surgery?

Updated: Jun 17, 2019
  • Author: Eric E Simon, MD; Chief Editor: Vecihi Batuman, MD, FASN  more...
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The most common precipitant of hyponatremia in patients after surgery [23] is the iatrogenic infusion of hypotonic fluids. Inappropriate administration of hypotonic intravenous fluids after surgery increases the risk of developing hyponatremia in these vulnerable patients, who retain water due to nonosmotic release of ADH, which is typically elevated for a few days after most surgical procedures. Hospital-acquired acute hyponatremia is disturbingly common also among hospitalized children and adults.

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