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Postoperative hyponatremia. A prospective study.

H M Chung, R Kluge, R W Schrier

    Archives of Internal Medicine
    |February 1, 1986
    PubMed
    Summary
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    Postoperative hyponatremia, a common complication after surgery, frequently occurs with normal or low body fluid levels. It is often caused by administering hypotonic fluids when the body retains water due to arginine vasopressin.

    Area of Science:

    • Nephrology
    • Endocrinology
    • Critical Care Medicine

    Background:

    • Postoperative hyponatremia is a frequent complication following surgical procedures.
    • Understanding the underlying causes and clinical implications is crucial for patient management.

    Purpose of the Study:

    • To investigate the incidence and contributing factors of postoperative hyponatremia.
    • To assess the clinical presentation and outcomes associated with hyponatremia in postoperative patients.

    Main Methods:

    • Prospective study of 1,088 patients undergoing surgery.
    • Monitoring plasma sodium concentration, volume status, and fluid administration.
    • Measurement of plasma arginine vasopressin levels in a subset of patients.

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    Main Results:

    • At least 4.4% of patients developed postoperative hyponatremia (plasma sodium < 130 mEq/L).
    • Commonly observed in normovolemic patients (42%), edematous states (21%), hyperglycemia (21%), volume depletion (8%), and renal failure (8%).
    • Arginine vasopressin was detected in all measured patients; 94% received hypotonic fluids. Positive water balance led to pulmonary congestion in 8 patients.

    Conclusions:

    • Postoperative hyponatremia is common across various surgical types.
    • Hypotonic fluid administration combined with non-osmotic arginine vasopressin secretion drives hyponatremia.
    • While not linked to neurological decline in this cohort, it can cause fluid overload complications like pulmonary congestion.