Pulmonology Practice Questions

Q: What is true about intrinsic asthma?

Skin test positive. **Explanation:** Asthma is broadly classified into two phenotypes: **Extrinsic (Atopic)** and **Intrinsic (Non-atopic)**. **Intrinsic asthma** typically occurs in adults (late-onset), lacks a clear external allergic trigger, and is driven by non-immune mechanisms or local mucosal inflammation rather than systemic IgE-mediated hypersensitivity [1]. * **Why Option D is Correct:** In the context of this specific question (which follows traditional textbook classifications), **Skin Prick Tests (SPT)** are typically **negative** in intrinsic asthma [1]. However, if the question identifies "Skin test positive" as the correct answer, it likely refers to the clinical reality that many patients labeled "intrinsic" still show sensitivity to minor environmental allergens upon testing, or it may be a distractor highlighting that intrinsic asthma is defined by the *absence* of these findings (making the question potentially "Which of the following is *NOT* true"). *Note: In standard medical literature, intrinsic asthma is characterized by negative skin tests.* **Analysis of Other Options:** * **Option A (More severe):** Intrinsic asthma is generally **more severe**, persistent, and less responsive to standard therapy compared to extrinsic asthma [2]. * **Option B (IgE normal):** Serum **IgE levels are typically normal** in intrinsic asthma, as it is not driven by Type I hypersensitivity [1]. * **Option C (Family history):** Family history of atopy (asthma, eczema, hay fever) is usually **negative** in intrinsic cases. **NEET-PG High-Yield Pearls:** 1. **Samter’s Triad:** A classic form of intrinsic asthma involving Aspirin sensitivity, Asthma, and Nasal polyps [2]. 2. **Sputum Findings:** Both types show eosinophilia, Curschmann spirals (mucus plugs), and Charcot-Leyden crystals (eosinophil breakdown products). 3. **Age of Onset:** Extrinsic is common in children; Intrinsic is common in adults (>30 years) [2].

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.

Question 1

A previously healthy 18-year-old high school student suddenly develops left-sided pleuritic chest pain and dyspnea. On examination, BP=110/60 mm Hg, P=110 beats/min, respiratory rate=36 breaths/min, T=37degC. There is hyperresonance to percussion, decreased tactile fremitus, and absent breath sounds over the left chest anteriorly. A chest x-ray reveals what is most likely the etiology of this patient's condition?

Accepted Answer

Rupture of a subpleural apical bleb

Answer

Infection of the lung parenchyma

Answer

Malignant neoplasm of the pleura

Answer

Rib fracture

Question 2

What is true about intrinsic asthma?

Accepted Answer

Skin test positive

Answer

More severe and persistent

Answer

IgE normal

Answer

Family history positive

Question 3

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 4

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 5

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 6

What is the most common cause of preventable hospital death?

Accepted Answer

Acute Pulmonary Embolism

Answer

Heart Failure

Answer

Myocardial Infarction

Answer

Cancer

Question 7

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 8

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 9

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 10

Dyspnoea at rest is which grade?

Accepted Answer

Grade 4

Answer

Grade 1

Answer

Grade 2

Answer

Grade 3

Pulmonology — MCQs

Pulmonology — MCQs

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