A 58-year-old man with small-cell lung cancer presents with confusion and lethargy. Serum sodium is 118 mEq/L. Urine osmolality is 650 mOsm/kg, urine sodium is 85 mEq/L, and plasma osmolality is 245 mOsm/kg. He is euvolemic on clinical examination. What is the most appropriate immediate next step in management?

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