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?
A. Recommend stereotactic body radiotherapy (SBRT) as an alternative to surgery
B. Proceed directly to lobectomy with standard perioperative monitoring
C. Initiate pulmonary rehabilitation alone and reassess spirometry in 2 weeks
D. Perform cardiopulmonary exercise testing (CPET) with measurement of maximal VO₂
Explanation
Why Perform cardiopulmonary exercise testing (CPET) with measurement of maximal VO₂ is right
When predicted postoperative FEV₁ or DLCO falls below 40% predicted (in this case, ppoFEV₁ = 28% predicted), the BTS Lung Cancer Surgery Guidelines 2023 and ACCP CHEST 2013 mandate cardiopulmonary exercise testing (CPET) as the next step to further stratify risk. CPET with maximal VO₂ measurement is the gold-standard functional assessment: VO₂max ≥20 mL/kg/min (or ≥75% predicted) indicates fitness for major resection despite borderline spirometry; VO₂max 10–20 mL/kg/min requires individual risk assessment; VO₂max <10 mL/kg/min (or <35% predicted) indicates very high risk and generally precludes major resection. This patient's ppoFEV₁ <30% predicted places him in the high-risk category (marked C), and CPET is the mandatory next step before deciding on surgery versus alternative strategies.
Why each distractor is wrong
Proceed directly to lobectomy with standard perioperative monitoring: This violates guideline-mandated stepwise assessment. A ppoFEV₁ of 28% predicted confers major cardiopulmonary morbidity (25–50%) and mortality (up to 10–15% for pneumonectomy) without further functional assessment. Proceeding without CPET exposes the patient to unquantified and likely unacceptable risk.
Recommend stereotactic body radiotherapy (SBRT) as an alternative to surgery: While SBRT is an appropriate alternative for inoperable patients, it is premature to recommend it before CPET. CPET may demonstrate adequate VO₂max, making surgery feasible. SBRT should be offered only after CPET results and multidisciplinary discussion confirm the patient is not a surgical candidate.
Initiate pulmonary rehabilitation alone and reassess spirometry in 2 weeks: Pulmonary rehabilitation (4–8 weeks of exercise and inspiratory muscle training) is an important optimization strategy for high-risk patients, but it is not a substitute for CPET. Spirometry reassessment alone does not provide the functional cardiopulmonary reserve data needed to guide operative risk stratification. CPET must precede or accompany rehabilitation planning.
High-YieldNEET PG
ppoFEV₁ or ppoDLCO <40% predicted → CPET is mandatory; VO₂max ≥20 mL/kg/min clears for surgery despite low spirometry.
BTS Lung Cancer Surgery Guidelines 2023; ACCP CHEST 2013; ERS/ESTS Guidelines
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