At change-of-shift report, the nurse learns the medical diagnoses for four patients. Which patient should the nurse assess most carefully for development of hyponatremia?
a. Vomiting all day and not replacing any fluid
b. Tumor that secretes excessive antidiuretic hormone (ADH)
c. Tumor that secretes excessive aldosterone
d. Tumor that destroyed the posterior pituitary gland
ANS: B
ADH causes renal reabsorption of water, which dilutes the body fluids. Excessive ADH thus causes hyponatremia. Excessive aldosterone causes ECV excess rather than hyponatremia. The posterior pituitary gland releases ADH; lack of ADH causes hypernatremia. Vomiting without fluid replacement causes ECV deficit and hypernatremia.
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