A 70-year-old man with a 40-pack-year smoking history presents with progressive shortness of breath, chronic cough, and frequent sputum production over the past two years. He reports difficulty climbing stairs and a recent increase in fatigue. On auscultation, there are decreased breath sounds and scattered wheezes bilaterally. A chest X-ray shows hyperinflated lungs with flattened diaphragms. What is the most likely diagnosis, and what is the typical pattern of pulmonary function tests in this condition?
The most likely diagnosis is Chronic Obstructive Pulmonary Disease (COPD), likely emphysema predominant.
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