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Plasma vasopressin in hypercalcaemic states.

B G Robinson, P Clifton-Bligh, S Posen

    Australian and New Zealand Journal of Medicine
    |February 1, 1983
    PubMed
    Summary
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    Hypercalcemia elevates plasma vasopressin (antidiuretic hormone) levels. However, patients showed reduced urine concentration, indicating kidney resistance to vasopressin's effects.

    Area of Science:

    • Endocrinology
    • Nephrology
    • Internal Medicine

    Background:

    • Hypercalcemia is a condition of elevated calcium levels in the blood.
    • Vasopressin, also known as antidiuretic hormone, regulates water balance.
    • The relationship between hypercalcemia and vasopressin action in the kidney is not fully understood.

    Purpose of the Study:

    • To investigate plasma vasopressin levels in patients with hypercalcemia.
    • To assess renal response to vasopressin in the context of hypercalcemia.

    Main Methods:

    • Plasma vasopressin was quantified using radioimmunoassay.
    • Measurements were performed in eight healthy individuals and six hypercalcemic patients.
    • Urine osmolality was measured to assess renal concentrating ability.

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    Main Results:

    • Plasma vasopressin levels were significantly higher in hypercalcemic patients compared to normal subjects.
    • Hypercalcemic patients exhibited lower urine osmolalities than controls.
    • A discrepancy was observed between elevated vasopressin and reduced urine concentration.

    Conclusions:

    • Hypercalcemia is associated with elevated circulating vasopressin.
    • The kidneys in hypercalcemic individuals display resistance to the effects of endogenous vasopressin.
    • This renal resistance may contribute to altered water homeostasis during hypercalcemia.