A 68-year-old man with a 50 pack-year smoking history presents with progressive dyspnea, chronic productive cough, and barrel chest. Spirometry shows post-bronchodilator FEV1 of 22% predicted and FEV1/FVC ratio of 0.58. His arterial blood gas on room air reveals PaO2 52 mmHg, PaCO2 48 mmHg, and pH 7.38. The spirometric findings shown in the diagram correspond to the structure marked **A**. Which of the following is the most appropriate immediate management for this patient's respiratory status?
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