Pulmonology Practice Questions

Q: Which of the following is NOT true about aspirin-sensitive asthma?

Increased prostaglandins. Aspirin-sensitive asthma, also known as **Aspirin-Exacerbated Respiratory Disease (AERD)** or **Samter’s Triad**, is characterized by a biochemical abnormality in the arachidonic acid metabolism pathway. **Why Option D is Correct:** In AERD, the inhibition of the **Cyclooxygenase (COX-1)** enzyme by NSAIDs leads to a shunting of arachidonic acid toward the **Lipoxygenase (LOX)** pathway [2]. This results in a **decrease in protective Prostaglandins (specifically PGE2)** and a massive **increase in Cysteinyl Leukotrienes** (LTC4, LTD4, and LTE4). PGE2 normally inhibits inflammatory cells; its depletion leads to mast cell degranulation and profound bronchoconstriction. Therefore, the statement "Increased prostaglandins" is false. **Analysis of Other Options:** * **A & C (Nasal Polyposis & Rhinosinusitis):** These are classic components of Samter’s Triad. Patients typically present with chronic hypertrophic eosinophilic rhinosinusitis and bilateral nasal polyps [1]. * **B (Treatment with Inhaled Corticosteroids):** Inhaled corticosteroids (ICS) remain the cornerstone of long-term management to control the underlying eosinophilic airway inflammation, often supplemented by leukotriene receptor antagonists (LTRAs) like Montelukast [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Samter’s Triad:** 1. Asthma, 2. Nasal Polyposis, 3. Aspirin/NSAID sensitivity [1]. * **Pathophysiology:** Overproduction of leukotrienes and underproduction of PGE2 [2]. * **Diagnosis:** Gold standard is the **Aspirin Challenge Test**. * **Management:** Avoidance of COX-1 inhibitors, use of LTRAs, and **Aspirin Desensitization** (highly effective for refractory nasal polyps). * **Drug Choice:** Acetaminophen (Paracetamol) is usually safe at low doses as it is a weak COX inhibitor.

Q: What is the most common cause of preventable hospital death?

Acute Pulmonary Embolism. **Explanation:** **Acute Pulmonary Embolism (PE)** is recognized globally as the **most common cause of preventable hospital death**. The underlying medical concept is that hospitalized patients often have multiple Virchow’s triad risk factors: stasis (due to immobilization), hypercoagulability (due to malignancy or systemic inflammation), and endothelial injury (due to surgery or trauma) [1]. Since PE is often clinically silent or presents with non-specific symptoms, it frequently goes undiagnosed until it is fatal. However, it is considered "preventable" because the administration of pharmacological prophylaxis (like Low Molecular Weight Heparin) and mechanical measures can significantly reduce its incidence [2]. **Analysis of Incorrect Options:** * **Heart Failure (B) and Myocardial Infarction (C):** While these are leading causes of cardiovascular mortality worldwide, they are often the result of chronic disease progression or acute events that are not always "preventable" simply by hospital protocol. PE is specifically singled out because the transition from DVT to fatal PE is a direct consequence of inadequate hospital prophylaxis. * **Cancer (D):** This is a leading cause of death overall, but it is a chronic pathological process rather than an acute, preventable hospital-acquired event [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common symptom of PE:** Tachypnea (followed by dyspnea). * **Most common ECG finding:** Sinus tachycardia (S1Q3T3 is specific but not sensitive). * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA). * **Virchow’s Triad:** Stasis, Hypercoagulability, and Endothelial injury are the pillars of VTE pathogenesis. * **Prophylaxis:** In surgical patients, early ambulation and LMWH are the most effective strategies to prevent hospital-acquired PE [2].

Q: Which of the following conditions is most sensitively detected by D-dimer testing?

Pulmonary embolism. **Explanation:** **1. Why Pulmonary Embolism (PE) is Correct:** D-dimer is a fibrin degradation product (FDP) produced when cross-linked fibrin is cleaved by plasmin. In Pulmonary Embolism, the endogenous fibrinolytic system attempts to break down the thrombus, leading to elevated D-dimer levels [1]. The clinical utility of D-dimer lies in its **high sensitivity (approx. 95-97%)** and high **Negative Predictive Value (NPV)**. A negative D-dimer (using a high-sensitivity assay) effectively rules out PE in patients with a low-to-moderate pre-test probability (Wells’ Score) [2]. **2. Why Incorrect Options are Wrong:** * **Acute Pulmonary Edema:** This is primarily a hemodynamic or hydrostatic issue (fluid in alveoli) rather than a thrombotic process. While D-dimer can be non-specifically elevated in systemic illness, it has no diagnostic role here. * **Cardiac Tamponade:** This is a mechanical compression of the heart due to pericardial fluid [1]. It does not involve the coagulation-fibrinolysis pathway. * **Acute Myocardial Infarction (AMI):** While AMI involves coronary thrombosis, D-dimer is not sensitive or specific enough for diagnosis. Troponins are the gold-standard biomarkers for AMI. **3. High-Yield Clinical Pearls for NEET-PG:** * **Rule-out Tool:** D-dimer is a "rule-out" test, not a "rule-in" test. It has low specificity because it can be elevated in pregnancy, malignancy, trauma, surgery, and old age [3]. * **Wells’ Criteria:** Always calculate the Wells’ score first. If the score suggests "PE Likely," proceed directly to CTPA; do not wait for D-dimer [2]. * **Age-Adjusted D-dimer:** For patients >50 years, use the formula: **Age × 10 µg/L** to reduce false positives [3]. * **Gold Standard:** CT Pulmonary Angiography (CTPA) remains the investigation of choice for confirming PE [2].

Q: A 60-year-old man with a 40-pack-year smoking history and 20 years of work as a construction worker presents with shortness of breath and occasional blood-streaked sputum. His ECG shows lateral wall ischemia. What is the likely cause of the findings on his chest x-ray?

Environmental occupational exposure. ***Environmental occupational exposure*** - 20 years of **construction work** leads to prolonged exposure to **asbestos** and **silica dust**, causing characteristic chest x-ray findings like **interstitial opacities**, **pleural plaques** (asbestosis), or **upper lobe nodules** with **eggshell calcifications** (silicosis). - The combination of **smoking history** and **occupational dust exposure** significantly increases the risk of developing **pneumoconiosis** and related pulmonary complications. *Chronic bronchitis* - Typically presents with **productive cough** with purulent sputum for at least 3 months per year for 2 consecutive years, but doesn't cause specific chest x-ray abnormalities. - While smoking is a risk factor, chronic bronchitis usually shows **normal chest x-ray** or **increased bronchovascular markings**, not the interstitial changes expected from occupational exposure. *Empyema* - Characterized by **infected pleural fluid** collection, presenting with **fever**, **pleuritic chest pain**, and **systemic toxicity**. - Chest x-ray would show **pleural effusion** with **air-fluid levels** if complicated, not the interstitial patterns typical of occupational lung disease. *Congestive heart failure* - While the **lateral wall ischemia** on ECG suggests cardiac involvement, CHF typically causes **bilateral lower lobe infiltrates**, **cardiomegaly**, and **pulmonary edema**. - The **ECG finding** is likely a **distractor** and not the primary cause of the chest x-ray changes, which are more consistent with occupational lung disease from construction work exposure.

Q: Dyspnoea at rest is which grade?

Grade 4. ### Explanation The grading of dyspnoea is most commonly based on the **Modified Medical Research Council (mMRC) Dyspnoea Scale**. This scale is a high-yield tool used clinically to assess the degree of baseline functional impairment in patients with chronic obstructive pulmonary disease (COPD) and other restrictive lung diseases [1]. **Why Grade 4 is Correct:** According to the mMRC scale, **Grade 4** represents the most severe level of breathlessness. At this stage, the patient is too breathless to leave the house or experiences **dyspnoea while dressing or undressing (dyspnoea at minimal exertion/rest)** [1]. **Analysis of Incorrect Options:** * **Grade 1:** The patient gets short of breath when hurrying on level ground or walking up a slight hill [1]. (Grade 0 is breathlessness only with strenuous exercise). * **Grade 2:** The patient walks slower than people of the same age on level ground because of breathlessness or has to stop for breath when walking at their own pace [1]. * **Grade 3:** The patient stops for breath after walking about 100 yards (or after a few minutes) on level ground [1]. **High-Yield Clinical Pearls for NEET-PG:** 1. **mMRC vs. NYHA:** While mMRC is primarily used for respiratory diseases (like COPD), the **NYHA (New York Heart Association) Classification** is used for heart failure. In NYHA, Class IV also represents symptoms at rest [1]. 2. **GOLD Criteria:** The mMRC score is a key component of the GOLD (Global Initiative for Chronic Obstructive Lung Disease) assessment tool to determine the severity of COPD and guide pharmacological therapy. 3. **Prognostic Value:** A higher mMRC grade is independently associated with a higher risk of mortality in COPD patients.

Q: A 60-year-old man with a past history of smoking for 30 years (he stopped 3 years ago, prior to cardiac bypass surgery) is admitted with cough and mild hemoptysis. He is afebrile with no shortness of breath. Physical exam is negative except for rhonchi in the left upper lung zone on auscultation. What is the finding or abnormality most likely to occur with the lesion seen on the chest X-ray?

Serum calcium of 13.6 mg/dL. ***Serum calcium of 13.6 mg/dL*** - **Squamous cell carcinoma** of the lung commonly causes **hypercalcemia** through **PTHrP (parathyroid hormone-related protein)** secretion as a paraneoplastic syndrome. - The clinical presentation of a **heavy smoker** with a **left upper lobe mass**, cough, and hemoptysis strongly suggests squamous cell lung carcinoma. *Sputum positive for fungal elements* - **Fungal infections** typically present with **fever** and **systemic symptoms**, which are absent in this afebrile patient. - The patient's **smoking history** and **unilateral upper lobe lesion** make malignancy more likely than fungal infection. *Increased D-dimer levels* - **D-dimer elevation** is associated with **pulmonary embolism** or **deep vein thrombosis**, but this patient has no **dyspnea** or chest pain. - The **localized rhonchi** and **hemoptysis** point to a **parenchymal lung lesion** rather than vascular pathology. *Koilonychia* - **Koilonychia (spoon-shaped nails)** is a sign of **chronic iron deficiency anemia**, not typically associated with lung masses. - While lung cancer can cause anemia, **koilonychia** develops over months to years and is not an acute finding with lung malignancy.

Q: Which of the following conditions typically presents with an exudative pleural effusion?

Mesothelioma. ### Explanation Pleural effusions are classified into **transudates** and **exudates** based on **Light’s Criteria** [1]. This distinction is fundamental in narrowing down the differential diagnosis. **Correct Answer: C. Mesothelioma** Mesothelioma is a primary malignancy of the pleura, typically associated with asbestos exposure. Malignancies cause **exudative effusions** because the tumor cells trigger an inflammatory response and increase capillary permeability, or obstruct lymphatic drainage [1]. This leads to the accumulation of fluid rich in protein and Lactate Dehydrogenase (LDH). **Incorrect Options:** * **A. Congestive Heart Failure (CHF):** This is the most common cause of **transudative** effusion. It occurs due to increased pulmonary capillary hydrostatic pressure, which "pushes" protein-poor fluid into the pleural space. * **B. Nephrotic Syndrome:** This causes a **transudative** effusion due to decreased plasma oncotic pressure (hypoalbuminemia), leading to systemic fluid leakage. * **C. Cirrhosis:** Hepatic hydrothorax in cirrhosis is **transudative**. It occurs when peritoneal fluid (ascites) moves across small defects in the diaphragm into the pleural space. **NEET-PG High-Yield Pearls:** 1. **Light’s Criteria for Exudate (Any one of the following):** * Pleural fluid protein / Serum protein ratio **> 0.5** * Pleural fluid LDH / Serum LDH ratio **> 0.6** * Pleural fluid LDH **> 2/3rd** the upper limit of normal serum LDH. 2. **Mesothelioma Marker:** Look for **Calretinin (+)** on immunohistochemistry. 3. **Pseudo-Meigs Syndrome:** A rare cause of transudative effusion associated with ovarian tumors. 4. **Low Glucose in Effusion:** Typically seen in Rheumatoid Arthritis, Empyema, or Malignancy [1].

Question 1

Which of the following is NOT true about aspirin-sensitive asthma?

Accepted Answer

Increased prostaglandins

Answer

Nasal polyposis

Answer

Treatment with inhaled corticosteroids

Answer

Rhinosinusitis

Question 2

A 74-year-old man with a history of smoking notices blood in his chronic daily sputum production. He has no fever or chills, but has lost 10 lb in the past 6 months. On examination, he has bilateral expiratory wheezes, and his fingers are clubbed. There are no lymph nodes and the remaining examination is normal. A chest X-ray reveals a left hilar mass. Which of the following suggests that the tumor is a small cell lung cancer?

Accepted Answer

Syndrome of inappropriate antidiuretic hormone (SIADH) secretion

Answer

Acanthosis nigricans

Answer

Cushing's syndrome

Answer

Leukemoid reaction

Question 3

Which of the following would be the most reasonable step in the assessment of a patient with emphysema due to alpha-1 antitrypsin deficiency (ATD)?

Accepted Answer

Acid starch gel electrophoresis

Answer

Measurement of sweat chloride concentration

Answer

High-resolution CT scan

Answer

Exercise stress test

Question 4

What is the most common cause of preventable hospital death?

Accepted Answer

Acute Pulmonary Embolism

Answer

Heart Failure

Answer

Myocardial Infarction

Answer

Cancer

Question 5

Which of the following conditions is most sensitively detected by D-dimer testing?

Accepted Answer

Pulmonary embolism

Answer

Acute pulmonary edema

Answer

Cardiac tamponade

Answer

Acute myocardial infarction

Question 6

A 60-year-old man with a 40-pack-year smoking history and 20 years of work as a construction worker presents with shortness of breath and occasional blood-streaked sputum. His ECG shows lateral wall ischemia. What is the likely cause of the findings on his chest x-ray?

Accepted Answer

Environmental occupational exposure

Answer

Chronic bronchitis

Answer

Empyema

Answer

Congestive heart failure

Question 7

A 28-year-old bank employee presents with infertility and oligospermia. He reports a history of recurrent pancreatitis and chronic cough since childhood, with evident digital clubbing. Which test is most likely to reveal the cause of his chronic lung disease?

Accepted Answer

Elevated sweat chloride levels (> 80 mEq/L)

Answer

Chest x-ray

Answer

X-ray of the humerus

Answer

Reduced sweat chloride levels (< 50 mEq/L)

Question 8

Dyspnoea at rest is which grade?

Accepted Answer

Grade 4

Answer

Grade 1

Answer

Grade 2

Answer

Grade 3

Question 9

A 60-year-old man with a past history of smoking for 30 years (he stopped 3 years ago, prior to cardiac bypass surgery) is admitted with cough and mild hemoptysis. He is afebrile with no shortness of breath. Physical exam is negative except for rhonchi in the left upper lung zone on auscultation. What is the finding or abnormality most likely to occur with the lesion seen on the chest X-ray?

Accepted Answer

Serum calcium of 13.6 mg/dL

Answer

Sputum positive for fungal elements

Answer

Increased D-dimer levels

Answer

Koilonychia

Question 10

Which of the following conditions typically presents with an exudative pleural effusion?

Accepted Answer

Mesothelioma

Answer

Congestive heart failure

Answer

Nephrotic syndrome

Answer

Cirrhosis

Pulmonology — MCQs

Pulmonology — MCQs

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