A 52-year-old man with chronic obstructive pulmonary disease (COPD) and cor pulmonale presents with acute exacerbation. ABG shows: pH 7.32, PaCO₂ 58 mmHg, HCO₃⁻ 28 mEq/L, PaO₂ 52 mmHg on room air. He is drowsy but arousable. Chest X-ray shows hyperinflation without acute infiltrate. Which is the most appropriate immediate next step in management?

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