A 68-year-old man with small-cell lung cancer presents with severe hyponatraemia (Na⁺ 118 mEq/L), confusion, and headache. Urine osmolality is 580 mOsm/kg and urine sodium is 95 mEq/L. Serum osmolality is 245 mOsm/kg. What is the most appropriate immediate management?

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