Cardiorespiratory Fitness After Lobectomy Versus Sublobar Resection

This observational study will compare changes in cardiorespiratory fitness after lobectomy and sublobar resection. Sublobar resection includes segmentectomy and wedge resection. Patients who can undergo pulmonary resection and meet the eligibility criteria will be studied during routine clinical care; the research will not assign the surgical procedure or add a study-specific intervention. Cardiopulmonary exercise testing (CPET) and pulmonary function testing will be performed before surgery and at routine follow-up visits 6 and 12 months after surgery. Changes from the preoperative assessment will be compared within each surgical group and between the two groups. The study will also examine the relationship between CPET measurements and postoperative complications.