A 58-year-old man with COPD presents to the emergency department with altered mental status. ABG shows: pH 7.28, PaCO₂ 72 mmHg, HCO₃⁻ 32 mEq/L, PaO₂ 48 mmHg on room air. Chest X-ray shows hyperinflation. What is the most appropriate immediate next step in management?

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