USMLE Step 1 COPD practice questions
Chronic obstructive pulmonary disease (COPD) is an umbrella term for chronic bronchitis and emphysema, both characterized by irreversible airflow obstruction (decreased FEV1/FVC) most commonly caused by cigarette smoking. For Step 1, focus on the underlying mechanisms rather than management: the protease-antiprotease imbalance and elastin destruction of emphysema, the mucous gland hyperplasia of chronic bronchitis, and the downstream physiologic consequences of chronic hypoxemia and loss of elastic recoil.
A 34-year-old man who has never smoked comes to the physician because of progressively worsening dyspnea over the past 8 months. He also reports mild jaundice and easy bruising. Pulmonary function tests show an obstructive pattern, and CT of the chest shows emphysematous changes predominantly in the lower lobes. Liver biopsy shows PAS-positive, diastase-resistant globules within hepatocytes. Which of the following is the most likely mechanism of this patient's pulmonary findings?
A 58-year-old man with a 40-pack-year smoking history comes to the physician because of a productive cough that has occurred on most days for the past 3 years, with exacerbations of purulent sputum during winter months. He denies dyspnea at rest. Spirometry shows an FEV1/FVC ratio of 0.65. Which of the following histologic findings is most likely to be seen on bronchial biopsy?
A 61-year-old woman with a 35-pack-year smoking history is evaluated for progressive exertional dyspnea. CT of the chest shows emphysematous changes that are most pronounced in the upper lobes. Which of the following structures is most likely to show the earliest and most severe destruction in this patient's lungs?
A 67-year-old man with a longstanding history of COPD presents with worsening bilateral lower extremity edema and jugular venous distention. Arterial blood gas shows a PaO2 of 52 mm Hg. Echocardiography shows right ventricular hypertrophy with preserved left ventricular ejection fraction. Which of the following is the most likely mechanism underlying this patient's peripheral edema?
A 70-year-old man with severe emphysema reports that he breathes more comfortably when he exhales slowly through pursed lips. Pulmonary function testing shows increased total lung capacity and residual volume with a decreased FEV1/FVC ratio. Which of the following best explains why pursed-lip breathing improves this patient's dyspnea?
COPD, answered
Does Step 1 test COPD treatment (bronchodilators, steroids, oxygen therapy)?
Generally no. Step 1 emphasizes mechanisms and pathophysiology of COPD (protease-antiprotease imbalance, mucous gland hyperplasia, hypoxic vasoconstriction), not management decisions, which are the focus of Step 2 CK.
How do I distinguish chronic bronchitis from emphysema on an exam question?
Chronic bronchitis is a clinical diagnosis (productive cough for at least 3 months in 2 consecutive years) with histology showing an increased Reid index from mucous gland hyperplasia. Emphysema is defined by destruction of alveolar walls distal to the terminal bronchiole, often with a classically described 'pink puffer' (thin, hyperinflated) versus 'blue bloater' (cyanotic, edematous) physiology, though both patterns commonly overlap in real patients.
Is alpha-1 antitrypsin deficiency high-yield for Step 1?
Yes. Know its autosomal codominant inheritance, the PiZZ genotype, the misfolded-protein mechanism causing both hepatocyte accumulation (liver disease) and unopposed elastase activity in the lung, and the resulting panacinar, lower lobe-predominant emphysema in young or nonsmoking patients.
Why does smoking-related emphysema affect the upper lobes while alpha-1 antitrypsin deficiency affects the lower lobes?
Smoking causes centriacinar emphysema concentrated in the upper lobes because inhaled irritants and inflammatory cells preferentially damage the proximal acinus (respiratory bronchioles) in higher-ventilation regions. Alpha-1 antitrypsin deficiency causes panacinar emphysema that is lower lobe-predominant because the enzyme deficiency is systemic and gravity-dependent perfusion differences make the bases more susceptible to unchecked elastase activity.
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