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Here are the answers to all 10 questions from the pulmonology MCQ test:
TEST: Current Issues of Pulmonology — Variant II
1. A 45-year-old with acute onset orthopnea, pink frothy sputum, hypertension and crackles on auscultation most likely has:
✅ A) Cardiogenic pulmonary edema
Pink frothy sputum + orthopnea + hypertension + bilateral crackles = classic acute cardiogenic pulmonary edema (flash pulmonary edema from elevated pulmonary capillary wedge pressure causing transudation of fluid into alveoli).
2. The most reliable test to differentiate cardiogenic from noncardiogenic pulmonary edema is:
✅ B) BNP level and echocardiography
BNP (B-type natriuretic peptide) is elevated in cardiac failure and near-normal in ARDS/noncardiogenic causes. Echocardiography directly assesses LV function. Together they are the gold standard for differentiation. Chest X-ray findings overlap significantly.
3. In suspected ARDS, the defining arterial oxygenation criterion is:
✅ A) PaO₂/FiO₂ ≤ 300 mmHg with bilateral infiltrates not fully explained by cardiac failure
Per the Berlin Definition of ARDS (2012):
- Mild: PaO₂/FiO₂ 201–300
- Moderate: 101–200
- Severe: ≤100 All require bilateral infiltrates not fully explained by heart failure.
4. The initial ventilatory strategy recommended for ARDS is:
✅ B) Low tidal volume (6 mL/kg predicted body weight) lung-protective ventilation
The ARDSNet trial (NEJM 2000) established that low tidal volume (6 mL/kg PBW) with plateau pressures ≤30 cmH₂O reduces mortality significantly compared to 12 mL/kg. High tidal volumes worsen ventilator-induced lung injury (volutrauma/barotrauma).
5. Sudden pleuritic chest pain, hemoptysis and unilateral leg swelling suggest:
✅ A) Pulmonary embolism from deep vein thrombosis
The classic triad of PE: pleuritic chest pain (pulmonary infarction), hemoptysis, and unilateral leg swelling (DVT). This is the textbook presentation of PE with pulmonary infarction.
6. The best initial test to evaluate for pulmonary embolism in a hemodynamically stable patient is:
✅ A) Ventilation-perfusion (V/Q) scan or CT pulmonary angiography depending on availability and pretest probability
In stable patients, CT pulmonary angiography (CTPA) is the first-line imaging in most centers (high sensitivity/specificity). V/Q scan is preferred when renal impairment or contrast allergy is present. Choice is guided by pretest probability (Wells score) and local availability.
7. Which condition commonly causes pulmonary hypertension secondary to chronic hypoxia?
✅ A) Interstitial lung disease and chronic obstructive pulmonary disease
Group 3 pulmonary hypertension (WHO classification) is caused by chronic lung disease and/or hypoxia. ILD and COPD are the most common causes — chronic alveolar hypoxia drives hypoxic pulmonary vasoconstriction, leading to remodeling and pulmonary HTN.
8. A young adult with recurrent spontaneous pneumothorax and apical bullae on CT should be evaluated for:
✅ B) Pulmonary Langerhans cell histiocytosis or primary spontaneous pneumothorax (smoker association)
In young smokers with recurrent pneumothorax and apical bullae/cysts on CT, pulmonary Langerhans cell histiocytosis (PLCH) must be considered. Primary spontaneous pneumothorax is also strongly associated with tall, thin, young male smokers with apical blebs. (Alpha-1 antitrypsin deficiency causes basal emphysema, not apical bullae predominantly.)
9. In severe sepsis with diffuse bilateral infiltrates and refractory hypoxemia, the most likely mechanism is:
✅ A) Increased alveolar capillary permeability leading to noncardiogenic pulmonary edema (ARDS)
Sepsis is the most common cause of ARDS. The systemic inflammatory response damages the alveolar-capillary membrane, causing massive permeability edema (protein-rich fluid floods the alveoli) — distinguishing it from cardiogenic (hydrostatic) edema.
10. Septic pulmonary emboli classically originate from:
✅ A) Right-sided infective endocarditis or infected venous thrombosis
Septic pulmonary emboli arise from infected right-heart valves (tricuspid most commonly — seen in IV drug users) or infected venous thrombi (e.g., septic thrombophlebitis, infected central venous catheters). They cause multiple peripheral, often cavitating pulmonary nodules on imaging.
Summary Answer Key
| Q | Answer |
|---|---|
| 1 | A |
| 2 | B |
| 3 | A |
| 4 | B |
| 5 | A |
| 6 | A |
| 7 | A |
| 8 | B |
| 9 | A |
| 10 | A |
Answer
Here are the answers to questions 11–20:
TEST: Current Issues of Pulmonology — Variant II (Questions 11–20)
11. The earliest radiologic sign of pulmonary edema on chest X-ray is often:
✅ A) Cardiomegaly and interstitial (perihilar) vascular congestion
The earliest CXR signs of pulmonary edema appear in sequence:
- Cardiomegaly + upper lobe vascular redistribution (cephalization)
- Kerley B lines (interstitial edema)
- Bat-wing/perihilar alveolar infiltrates
- Pleural effusions
Perihilar vascular congestion and cardiomegaly precede alveolar flooding.
12. Drug-induced eosinophilic pneumonia is most commonly associated with:
✅ A) Nitrofurantoin, daptomycin and some NSAIDs/antibiotics
Classic culprits for drug-induced eosinophilic lung disease include nitrofurantoin, daptomycin, NSAIDs, minocycline, and some antibiotics. Metformin, statins, and PPIs are not recognized causes.
13. Pulmonary involvement in systemic sclerosis (scleroderma) most commonly causes:
✅ A) Usual interstitial pneumonia (UIP) pattern with lower-lobe fibrosis and pulmonary hypertension
Scleroderma is the connective tissue disease most strongly associated with pulmonary complications. The two dominant pulmonary manifestations are:
- ILD (most commonly NSIP pattern, though UIP also occurs) with lower-lobe predominant fibrosis
- Pulmonary arterial hypertension (especially in limited cutaneous SSc/CREST)
Option A best captures this combination among the choices.
14. Amyloid deposition in the lung can present with which pulmonary function test pattern?
✅ A) Restrictive pattern (reduced TLC and DLCO)
Pulmonary amyloidosis causes parenchymal infiltration and stiffening of lung tissue, resulting in a restrictive defect with reduced TLC and impaired gas transfer (reduced DLCO). It does not cause pure obstruction.
15. Occupational hypersensitivity pneumonitis (e.g., farmer's lung) is mediated primarily by:
✅ A) Immune complex and cell-mediated hypersensitivity to inhaled organic antigens
Hypersensitivity pneumonitis (extrinsic allergic alveolitis) involves both:
- Type III (immune complex/precipitin-mediated) in acute phases
- Type IV (cell-mediated, CD4+ T-cell granulomatous) in subacute/chronic phases
It is an immunological reaction to inhaled organic antigens (fungal spores, thermophilic actinomycetes, animal proteins), not direct chemical toxicity or infection.
16. Pulmonary hemorrhage with acute hemoptysis, anemia and diffuse alveolar infiltrates is most consistent with:
✅ A) Diffuse alveolar hemorrhage syndromes (e.g., vasculitis, Goodpasture syndrome)
The triad of hemoptysis + iron-deficiency/hemolytic anemia + diffuse bilateral alveolar infiltrates defines diffuse alveolar hemorrhage (DAH). Causes include anti-GBM disease (Goodpasture), ANCA vasculitis (GPA, MPA), SLE, and others. Bronchitis and PE without infarction do not cause this full syndrome.
17. Indications for urgent lung transplantation include:
✅ A) End-stage respiratory failure with poor prognosis despite maximal therapy, preserved rehabilitation potential and acceptable comorbidity profile
Lung transplantation is reserved for patients with end-stage lung disease (COPD, IPF, CF, PAH) who have exhausted medical therapy, have a predicted survival <2 years without transplant, adequate functional status to survive surgery, and no disqualifying comorbidities. Newly diagnosed COPD, simple pneumothorax, and minor effusions are not indications.
18. The role of viral infections in ARDS pathogenesis is primarily:
✅ A) Direct epithelial injury and dysregulated host inflammatory response increasing alveolar permeability
Viruses (influenza, SARS-CoV-2, etc.) cause ARDS via:
- Direct cytopathic injury to type I and II pneumocytes
- Dysregulated innate immune/cytokine storm response
- Endothelial activation and increased alveolar-capillary permeability
This leads to noncardiogenic pulmonary edema (ARDS), not simply upper airway symptoms or cardiogenic edema.
19. Pulmonary manifestations of systemic lupus erythematosus (SLE) can include:
✅ A) Pleuritis, diffuse alveolar hemorrhage, interstitial lung disease and pulmonary hypertension
SLE has the broadest range of pulmonary manifestations of all connective tissue diseases:
- Pleuritis/pleural effusion (most common)
- Diffuse alveolar hemorrhage (rare but life-threatening)
- ILD (NSIP pattern)
- Pulmonary arterial hypertension
- Shrinking lung syndrome
- Acute lupus pneumonitis
20. Septic shock causes acute lung injury primarily via:
✅ A) Systemic inflammatory response with endothelial activation, capillary leak and neutrophil-mediated lung injury (leading to ARDS)
Sepsis triggers a massive systemic inflammatory cascade (TNF-α, IL-1, IL-6, complement), activating neutrophils and endothelium. Neutrophil sequestration in pulmonary capillaries, along with endothelial injury, causes capillary leak and flooding of alveoli with protein-rich fluid — the hallmark of ARDS. This is distinct from simple bronchoconstriction or cardiac tamponade.
Summary Answer Key (Q11–20)
| Q | Answer |
|---|---|
| 11 | A |
| 12 | A |
| 13 | A |
| 14 | A |
| 15 | A |
| 16 | A |
| 17 | A |
| 18 | A |
| 19 | A |
| 20 | A |
Choose single best answer
Questions 11–20 — Single Best Answers
11. ✅ A) Cardiomegaly and interstitial (perihilar) vascular congestion
Upper lobe vascular redistribution and cardiomegaly are the earliest CXR findings, preceding Kerley B lines and alveolar flooding.
12. ✅ A) Nitrofurantoin, daptomycin and some NSAIDs/antibiotics
These are the classic culprits for drug-induced eosinophilic pneumonia. Nitrofurantoin is the most well-documented offender.
13. ✅ A) Usual interstitial pneumonia (UIP) pattern with lower-lobe fibrosis and pulmonary hypertension
Scleroderma (SSc) most commonly causes ILD (NSIP > UIP pattern) with basilar fibrosis, and pulmonary arterial hypertension — especially in limited SSc/CREST. This is the best answer among the options.
14. ✅ A) Restrictive pattern (reduced TLC and DLCO)
Pulmonary amyloidosis infiltrates and stiffens lung parenchyma → restrictive physiology with reduced TLC and impaired gas transfer (reduced DLCO).
15. ✅ A) Immune complex and cell-mediated hypersensitivity to inhaled organic antigens
Hypersensitivity pneumonitis involves Type III (immune complex/precipitin) in acute phases and Type IV (granulomatous, T-cell mediated) in chronic phases — triggered by inhaled organic antigens (mold, thermophilic bacteria, bird proteins).
16. ✅ A) Diffuse alveolar hemorrhage syndromes (e.g., vasculitis, Goodpasture syndrome)
The triad of hemoptysis + anemia + diffuse bilateral alveolar infiltrates = DAH. Causes include Goodpasture syndrome (anti-GBM), ANCA vasculitis (GPA/MPA), and SLE.
17. ✅ A) End-stage respiratory failure with poor prognosis despite maximal therapy, preserved rehabilitation potential and acceptable comorbidity profile
Lung transplant is indicated for end-stage disease with <2-year predicted survival without transplant, adequate functional reserve, and no major contraindications. Newly diagnosed COPD or simple pneumothorax are never indications.
18. ✅ A) Direct epithelial injury and dysregulated host inflammatory response increasing alveolar permeability
Viruses (influenza, SARS-CoV-2) cause ARDS via direct pneumocyte injury + cytokine storm → endothelial/epithelial barrier breakdown → noncardiogenic alveolar flooding.
19. ✅ A) Pleuritis, diffuse alveolar hemorrhage, interstitial lung disease and pulmonary hypertension
SLE has the broadest spectrum of pulmonary involvement of all CTDs: pleuritis (most common), DAH (life-threatening), ILD, PAH, acute lupus pneumonitis, and shrinking lung syndrome.
20. ✅ A) Systemic inflammatory response with endothelial activation, capillary leak and neutrophil-mediated lung injury (leading to ARDS)
Septic shock → TNF-α/IL-1/IL-6 surge → neutrophil sequestration in pulmonary capillaries → endothelial injury → capillary leak → protein-rich alveolar flooding = ARDS.
Answer Key Summary
| Q | Answer |
|---|---|
| 11 | A |
| 12 | A |
| 13 | A |
| 14 | A |
| 15 | A |
| 16 | A |
| 17 | A |
| 18 | A |
| 19 | A |
| 20 | A |
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