A 62-year-old man with a 40 pack-year smoking history presents with a left upper lobe lung cancer (T2N0M0). Preoperative spirometry shows FEV₁ = 1.2 L (35% predicted) and DLCO = 55% predicted. The planned surgery is left upper lobe lobectomy. Using the segment-counting method, his predicted postoperative (PPO) FEV₁ is calculated at 28% predicted. The structure marked **C** in the diagram represents his current risk category. Which of the following is the MOST appropriate next step in preoperative assessment?
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