A patient with pancreatic cancer has been admitted to the critical care unit with clinical signs consistent with syndrome of inappropriate secretion of antidiuretic hormone. Which clinical management strategy does the nurse anticipate for this condition?

Rationale: A. Low sodium diet is incorrect because SIADH is characterized by water retention leading to hyponatremia, not sodium excess. Reducing dietary sodium would worsen hyponatremia, so a low sodium diet is contraindicated. B. Fluid restriction is correct because the primary problem in SIADH is excess water retention due to inappropriate antidiuretic hormone secretion, which dilutes serum sodium. Restricting fluids limits further dilution, helps restore sodium balance, and prevents worsening hyponatremia. Fluid restriction is typically the first-line management in stable patients. C. Administration of 3% normal saline is incorrect as a routine measure because hypertonic saline is reserved for severe or symptomatic hyponatremia (e.g., seizures, severe confusion). Overuse can cause rapid sodium shifts and central pontine myelinolysis, which is dangerous. D. Administration of exogenous vasopressin is incorrect because SIADH is caused by excess ADH. Giving additional vasopressin would exacerbate water retention and hyponatremia, worsening the patient’s condition.