A 72-year-old woman with congestive heart failure on furosemide and lisinopril presents with acute-onset severe headache, restlessness, and a single seizure. Serum sodium is 112 mEq/L, plasma osmolality is 235 mOsm/kg, and she appears clinically volume-depleted (dry mucosa, orthostatic BP drop). Urine sodium is 15 mEq/L and urine osmolality is 380 mOsm/kg. What is the most appropriate immediate next step?

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