Obstructive And Restrictive Lung Disease - USMLE Step 2

1. A 70-year-old with asbestos exposure has progressive dyspnea; PFT shows low TLC and low DLCO; exam reveals crackles. Which treatment is most appropriate?​
   Answer: Smoking cessation counseling and routine vaccinations This question tests USMLE Step 2 CK knowledge of obstructive and restrictive lung disease, focusing on diagnosis and management. Pulmonary function tests differentiate between obstructive (e.g., COPD, asthma) and restrictive diseases (e.g., pulmonary fibrosis, interstitial lung disease) based on FEV1/FVC ratios. In this vignette, the patient's history and spirometry results suggest asbestosis. The smoking cessation counseling and routine vaccinations are appropriate due to their role in preventing complications in restrictive lung disease. Choice A is correct because it aligns with ATS guidelines for managing asbestos-related ILD. Choice B is incorrect because it fails to consider the risks of long-term oral steroids in non-inflammatory ILD. Teach students to assess spirometry results carefully and consider patient history, such as smoking status or occupational exposures, when forming a differential diagnosis. Encourage familiarity with guidelines for common pulmonary conditions.
2. In addition to inhaled short-acting beta-agonists and oxygen, which of the following is the most critical intervention at this time?
   Answer: Administration of systemic corticosteroids This patient is experiencing a moderate-to-severe asthma exacerbation. The cornerstone of management for such exacerbations, in addition to supplemental oxygen and repetitive short-acting beta-agonists (SABAs), is early administration of systemic corticosteroids (e.g., prednisone, methylprednisolone). Systemic corticosteroids reduce airway inflammation and are crucial for resolving the exacerbation and preventing relapse. Inhaled corticosteroids and other long-term controllers are not effective for acute management.
3. A 65-year-old smoker has chronic cough and dyspnea; spirometry shows FEV1/FVC 0.65. Which interpretation is most accurate?​
   Answer: Obstructive defect consistent with COPD physiology This question tests USMLE Step 2 CK knowledge of obstructive and restrictive lung disease, focusing on diagnosis and management. Pulmonary function tests differentiate between obstructive (e.g., COPD, asthma) and restrictive diseases (e.g., pulmonary fibrosis, interstitial lung disease) based on FEV1/FVC ratios. In this vignette, the patient's history and spirometry results suggest COPD. The obstructive defect consistent with COPD physiology is appropriate due to the low FEV1/FVC ratio. Choice A is correct because it aligns with GOLD spirometric criteria for COPD. Choice B is incorrect because it fails to consider that restrictive defects have normal or high FEV1/FVC. Teach students to assess spirometry results carefully and consider patient history, such as smoking status or occupational exposures, when forming a differential diagnosis. Encourage familiarity with guidelines for common pulmonary conditions.
4. A normal DLCO in this patient would point towards which of the following as the cause of her restrictive lung disease?
   Answer: Morbid obesity Restrictive lung disease can be caused by intrinsic (parenchymal) disease or extrinsic causes (chest wall, pleura, neuromuscular weakness). DLCO helps differentiate these. Intrinsic diseases like pulmonary fibrosis, asbestosis, and sarcoidosis damage the alveolar-capillary membrane, leading to a low DLCO. Extrinsic causes, such as morbid obesity, kyphoscoliosis, or neuromuscular diseases, restrict lung expansion but leave the lung parenchyma intact, resulting in a restrictive pattern on spirometry with a normal DLCO.
5. A 30-year-old woman has episodic wheeze with exercise; spirometry shows obstruction that improves 15% after albuterol. Which next step confirms diagnosis and starts care?​
   Answer: Begin low-dose ICS with SABA as needed This question tests USMLE Step 2 CK knowledge of obstructive and restrictive lung disease, focusing on diagnosis and management. Pulmonary function tests differentiate between obstructive (e.g., COPD, asthma) and restrictive diseases (e.g., pulmonary fibrosis, interstitial lung disease) based on FEV1/FVC ratios. In this vignette, the patient's history and spirometry results suggest asthma. The low-dose ICS with SABA as needed is appropriate due to its efficacy in controlling mild persistent asthma symptoms. Choice B is correct because it aligns with GINA guidelines for step 2 asthma management. Choice A is incorrect because it fails to consider the need for anti-inflammatory therapy in asthma with reversible obstruction. Teach students to assess spirometry results carefully and consider patient history, such as smoking status or occupational exposures, when forming a differential diagnosis. Encourage familiarity with guidelines for common pulmonary conditions.
6. Use of her primary controller medication is associated with an increased risk of which of the following?
   Answer: Oral candidiasis Fluticasone is an inhaled corticosteroid (ICS). The most common local side effects of ICS therapy are oropharyngeal candidiasis (thrush) and dysphonia (hoarseness). These risks can be minimized by using a spacer device and rinsing the mouth after use. While high-dose systemic corticosteroids are associated with osteoporosis, the risk from standard-dose inhaled corticosteroids is much lower, though still a consideration. Hepatic and renal toxicity are not typical side effects. Oral candidiasis is a very common and direct side effect.
7. FVC 58%, FEV1/FVC 0.88, TLC 66%, DLCO/VA 110%. Most likely basis?
   Answer: Respiratory muscle weakness Low FVC and TLC with a high FEV1/FVC ratio indicate a restrictive pattern. A preserved or elevated DLCO/VA means the lung parenchyma itself is not the problem, so extrapulmonary restriction like respiratory muscle weakness fits. The most tempting wrong answer is interstitial lung fibrosis, but that typically lowers DLCO/VA.
8. A 65-year-old smoker has COPD symptoms; spirometry shows FEV1/FVC 0.60; he continues smoking. Which intervention most improves long-term mortality?​
   Answer: Smoking cessation with pharmacotherapy and counseling This question tests USMLE Step 2 CK knowledge of obstructive and restrictive lung disease, focusing on diagnosis and management. Pulmonary function tests differentiate between obstructive (e.g., COPD, asthma) and restrictive diseases (e.g., pulmonary fibrosis, interstitial lung disease) based on FEV1/FVC ratios. In this vignette, the patient's history and spirometry results suggest COPD. The smoking cessation with pharmacotherapy and counseling is appropriate due to its proven impact on slowing disease progression. Choice A is correct because it aligns with GOLD guidelines emphasizing smoking cessation as the most effective intervention. Choice B is incorrect because it fails to consider that ICS monotherapy is not first-line for all COPD patients. Teach students to assess spirometry results carefully and consider patient history, such as smoking status or occupational exposures, when forming a differential diagnosis. Encourage familiarity with guidelines for common pulmonary conditions.
9. FEV1/FVC 0.55, TLC 112%, DLCO 38% predicted. Which mechanism predominates?
   Answer: Alveolar septal destruction Low FEV1/FVC with high TLC confirms obstruction and hyperinflation. Markedly low DLCO points to loss of alveolar-capillary surface, the hallmark of emphysema, so alveolar septal destruction predominates. Airway smooth muscle spasm can obstruct and hyperinflate, but DLCO is usually preserved, not 38%.
10. Which of the following patterns on pulmonary function testing is most expected in this patient?
    Answer: Normal FEV1/FVC, decreased TLC, normal DLCO Myasthenia gravis is a neuromuscular disorder that causes weakness of the respiratory muscles, including the diaphragm. This weakness leads to an extrinsic restrictive lung disease pattern. The PFT findings will show a reduced total lung capacity (TLC) and forced vital capacity (FVC), with a preserved or normal FEV1/FVC ratio. Because the lung parenchyma itself is unaffected, the diffusing capacity for carbon monoxide (DLCO) is expected to be normal.
11. Which of the following is the most appropriate management plan?
    Answer: Inhaled bronchodilators, systemic corticosteroids, and antibiotics This patient is presenting with an acute exacerbation of COPD. The three cardinal symptoms are increased dyspnea, increased sputum volume, and increased sputum purulence. The presence of all three symptoms (or two, if one is increased purulence) is a strong indication for antibiotics in addition to standard therapy with inhaled bronchodilators and systemic corticosteroids. NIPPV is indicated for patients with acute respiratory failure (e.g., acidosis, hypercapnia, severe dyspnea), but initial medical management should be started first.
12. A 55-year-old woman with progressive dyspnea and dry cough has bibasilar crackles; PFT shows low TLC with normal FEV1/FVC; HRCT shows reticular opacities. Next step?​
    Answer: Order autoimmune serologies and exposure review This question tests USMLE Step 2 CK knowledge of obstructive and restrictive lung disease, focusing on diagnosis and management. Pulmonary function tests differentiate between obstructive (e.g., COPD, asthma) and restrictive diseases (e.g., pulmonary fibrosis, interstitial lung disease) based on FEV1/FVC ratios. In this vignette, the patient's history and spirometry results suggest interstitial lung disease. The autoimmune serologies and exposure review are appropriate due to the need to identify underlying causes like connective tissue disease or hypersensitivity. Choice B is correct because it aligns with ATS/ERS guidelines for evaluating suspected ILD. Choice A is incorrect because it fails to consider the restrictive pattern requiring further diagnostic workup beyond empiric treatment. Teach students to assess spirometry results carefully and consider patient history, such as smoking status or occupational exposures, when forming a differential diagnosis. Encourage familiarity with guidelines for common pulmonary conditions.
13. Which of the following is the most likely diagnosis?
    Answer: Allergic bronchopulmonary aspergillosis (ABPA) Allergic bronchopulmonary aspergillosis (ABPA) is a hypersensitivity reaction to Aspergillus fumigatus that occurs almost exclusively in patients with asthma or cystic fibrosis. The clinical picture includes poorly controlled asthma, production of brownish mucus plugs, fleeting pulmonary infiltrates, central bronchiectasis, peripheral eosinophilia, and markedly elevated total serum IgE levels. This patient's presentation is classic for ABPA.
14. FVC 58%, FEV1/FVC 0.84, TLC 86% predicted. Best interpretation?
    Answer: Restriction is excluded FEV1/FVC is 0.84, so obstruction is absent. A low FVC with a normal ratio may suggest restriction, but restriction requires reduced TLC, and 86% predicted is normal. The tempting error is calling this obstruction because FVC is low, but the ratio rules that out. Air trapping and mixed defects also need additional abnormal findings you don't have.
15. Which of the following is the most likely diagnosis?
    Answer: Chronic obstructive pulmonary disease The patient's clinical presentation (long-term smoker, chronic cough, dyspnea) and pulmonary function tests are classic for chronic obstructive pulmonary disease (COPD). The key finding is an FEV1/FVC ratio of < 0.70 (here it is 0.50), which defines an obstructive pattern. The increased total lung capacity is consistent with air trapping, and the decreased DLCO reflects emphysematous destruction of the alveolar-capillary membrane.
16. A 70-year-old with asbestos exposure and pleural plaques asks about cancer risk. Which is the most appropriate counseling point?​
    Answer: Smoking cessation reduces lung cancer risk substantially This question tests USMLE Step 2 CK knowledge of obstructive and restrictive lung disease, focusing on diagnosis and management. Pulmonary function tests differentiate between obstructive (e.g., COPD, asthma) and restrictive diseases (e.g., pulmonary fibrosis, interstitial lung disease) based on FEV1/FVC ratios. In this vignette, the patient's history and spirometry results suggest asbestosis. The counseling that smoking cessation reduces lung cancer risk substantially is appropriate due to the synergistic risk with asbestos. Choice A is correct because it aligns with ATS and USPSTF guidelines on asbestos and smoking risks. Choice B is incorrect because it fails to consider that asbestosis increases, not eliminates, cancer risk. Teach students to assess spirometry results carefully and consider patient history, such as smoking status or occupational exposures, when forming a differential diagnosis. Encourage familiarity with guidelines for common pulmonary conditions.
17. A 30-year-old with suspected asthma has symptoms with cat exposure; spirometry normal today. Which treatment is most appropriate to initiate now?​
    Answer: Low-dose inhaled corticosteroid plus rescue SABA This question tests USMLE Step 2 CK knowledge of obstructive and restrictive lung disease, focusing on diagnosis and management. Pulmonary function tests differentiate between obstructive (e.g., COPD, asthma) and restrictive diseases (e.g., pulmonary fibrosis, interstitial lung disease) based on FEV1/FVC ratios. In this vignette, the patient's history and spirometry results suggest allergic asthma. The low-dose inhaled corticosteroid plus rescue SABA is appropriate due to its efficacy in mild asthma with triggers. Choice A is correct because it aligns with GINA guidelines for step 1 or 2 asthma therapy. Choice B is incorrect because it fails to consider that long-term oxygen is for severe hypoxemia, not mild asthma. Teach students to assess spirometry results carefully and consider patient history, such as smoking status or occupational exposures, when forming a differential diagnosis. Encourage familiarity with guidelines for common pulmonary conditions.
18. A 70-year-old former shipyard worker with asbestos exposure has dry cough, dyspnea, crackles; imaging shows diffuse interstitial thickening and pleural plaques. Most appropriate next test?​
    Answer: Order full PFTs with DLCO measurement This question tests USMLE Step 2 CK knowledge of obstructive and restrictive lung disease, focusing on diagnosis and management. Pulmonary function tests differentiate between obstructive (e.g., COPD, asthma) and restrictive diseases (e.g., pulmonary fibrosis, interstitial lung disease) based on FEV1/FVC ratios. In this vignette, the patient's history and spirometry results suggest asbestosis. The full PFTs with DLCO measurement are appropriate due to their role in assessing diffusion impairment in interstitial diseases. Choice A is correct because it aligns with ATS guidelines for evaluating asbestos-related lung disease. Choice B is incorrect because it fails to consider the restrictive pattern inconsistent with COPD. Teach students to assess spirometry results carefully and consider patient history, such as smoking status or occupational exposures, when forming a differential diagnosis. Encourage familiarity with guidelines for common pulmonary conditions.
19. Which of the following is the most appropriate initial treatment for this patient?
    Answer: A short-acting beta-agonist used 15 minutes before exercise This patient's symptoms are classic for exercise-induced bronchoconstriction (EIB). The first-line treatment for EIB is the prophylactic use of a short-acting beta-agonist (SABA), such as albuterol, taken 10-20 minutes before exercise. This prevents the bronchoconstriction triggered by exertion. Daily controller medications like ICS or leukotriene antagonists are considered if symptoms persist despite pre-treatment with a SABA or if the patient also has persistent asthma.
20. A 55-year-old with suspected ILD has restrictive PFTs and reticular opacities; oxygen saturation drops with exertion. Which management is most appropriate now?​
    Answer: Refer to pulmonology for ILD evaluation and monitoring This question tests USMLE Step 2 CK knowledge of obstructive and restrictive lung disease, focusing on diagnosis and management. Pulmonary function tests differentiate between obstructive (e.g., COPD, asthma) and restrictive diseases (e.g., pulmonary fibrosis, interstitial lung disease) based on FEV1/FVC ratios. In this vignette, the patient's history and spirometry results suggest interstitial lung disease. The referral to pulmonology for ILD evaluation and monitoring is appropriate due to desaturation indicating severity. Choice A is correct because it aligns with ATS guidelines for managing progressive ILD. Choice B is incorrect because it fails to consider that LABA is for obstructive diseases. Teach students to assess spirometry results carefully and consider patient history, such as smoking status or occupational exposures, when forming a differential diagnosis. Encourage familiarity with guidelines for common pulmonary conditions.

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