COPD Pathology

In COPD, which of the following mechanisms is responsible for the development of cor pulmonale?

A 58-year-old male smoker with 40 pack-year history presents with progressive dyspnea and a DLCO of 45% predicted. On histology, there is loss of alveolar walls predominantly in the upper lung lobes with sparing of the lower lobes. Which feature best distinguishes this type of emphysema from panacinar emphysema?

A 62-year-old man with a 40 pack-year smoking history presents with progressive dyspnea on exertion, chronic productive cough, and recurrent lower respiratory tract infections over the past 3 years. Spirometry shows FEV₁/FVC ratio of 0.58 with FEV₁ 45% predicted. High-resolution CT chest reveals extensive centrilobular emphysema with bronchial wall thickening. Pathological examination of a lung biopsy shows destruction of alveolar walls with loss of elastic recoil and enlarged air spaces distal to the terminal bronchioles. Which of the following best describes the primary pathological lesion in this patient?

A 58-year-old Indian male smoker (35 pack-years) with COPD presents to the respiratory clinic with worsening dyspnea and a productive cough. Spirometry shows FEV₁ 38% predicted with a post-bronchodilator FEV₁/FVC of 0.52. Chest X-ray reveals hyperinflation with flattened diaphragms. A lung biopsy specimen is examined under the microscope and shows chronic inflammation with infiltration of CD8+ T lymphocytes, macrophages, and neutrophils in the small airways and parenchyma. Additionally, there is evidence of oxidative stress with increased reactive oxygen species (ROS) and reduced antioxidant defenses. Which of the following best explains the mechanism of progressive airway destruction in this patient's COPD?

A 62-year-old male smoker with a 40 pack-year history presents with progressive dyspnea, chronic cough, and sputum production for 5 years. Clinical examination reveals barrel chest, pursed-lip breathing, and reduced breath sounds bilaterally. Which investigation is most appropriate to confirm the diagnosis and assess the severity of airflow obstruction?