• Internal medicine · May 2022

    Case Reports

    Tonicity Matters, Especially in Complex Hyponatremia Resulting from Pseudo-, Trans-locational, and True Hypotonic Hyponatremia: An Educational Case Report.

    • Masatomo Ogata, Satoru Morikubo, Naohiko Imai, Yugo Shibagaki, and Masahiko Yazawa.
    • Division of Nephrology and Hypertension, Department of Internal Medicine, St. Marianna University School of Medicine, Japan.
    • Intern. Med. 2022 May 15; 61 (10): 1567-1571.

    AbstractSerum tonicity is defined by the serum concentrations of sodium (sNa) and glucose, which can promote free water movement across intra/extracellular compartments. Rapid changes in serum tonicity can cause brain damage. We herein report an educational case of a patient with hyponatremia (sNa: 112 mEq/L) concomitant with acute alcoholic pancreatitis. The cause of hyponatremia was considered complex. Pseudo- and trans-locational natremia was secondary to hyperglycemia (721 mg/dL) and hypertriglyceridemia (1,768 mg/dL), respectively, and true hypotonic hyponatremia. Regarding sNa correction, rapid correction was suspected. However, this was safely managed by monitoring tonicity (not sNa or osmolarity), thereby avoiding brain damage.

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