A 65-year-old patient with a history of breast cancer presents with weakness, nausea, and confusion. Laboratory results indicate elevated calcium levels. Which intervention should the nurse prioritize for this patient exhibiting signs of hypercalcemia?

Choice A rationale While steroids can be used in the management of hypercalcemia associated with certain hematologic malignancies or vitamin D toxicity, they are not the immediate priority for acute stabilization. Corticosteroids work by decreasing intestinal calcium absorption and inhibiting bone resorption, but their onset of action is relatively slow, taking several days to manifest. In the context of symptomatic hypercalcemia, more rapid interventions like aggressive hydration are required to protect renal function and lower serum calcium. Choice B rationale The primary physiological priority in treating hypercalcemia is the restoration of intravascular volume and the enhancement of urinary calcium excretion through aggressive hydration. Hypercalcemia induces a nephrogenic diabetes insipidus, leading to profound dehydration which further impairs the kidneys' ability to clear excess calcium. Administering large volumes of isotonic saline, or encouraging high oral intake if tolerated, increases the glomerular filtration rate and promotes sodium-induced calcium diuresis within the renal tubules. Choice C rationale Positioning a patient in a supine position does not address the underlying biochemical imbalance of elevated serum calcium levels and could potentially worsen the risk of respiratory complications or skin breakdown. Patients with hypercalcemia are at increased risk for pathological fractures due to bone resorption; however, mobility is actually encouraged as weight-bearing activity helps move calcium back into the bone matrix. Prolonged immobilization in any position can further exacerbate bone demineralization and increase serum calcium concentrations. Choice D rationale While infection can complicate the clinical picture of a patient with cancer, the primary presenting symptoms of nausea, confusion, and weakness in a patient with known breast cancer strongly point toward humoral hypercalcemia of malignancy. Obtaining blood cultures is an appropriate intervention if sepsis is suspected, but it does not address the life-threatening metabolic emergency currently evidenced by the elevated calcium levels. Prioritizing fluid resuscitation is essential to prevent cardiac arrhythmias and acute renal failure.