Pulmonology — MCQs

Pulmonology Indian Medical PG Practice Questions and MCQs

Question 211: Exercise-induced asthma is not precipitated by which of the following?

A. High altitude climb and exercise
B. Cycling in cold weather
C. Swimming in hot water (Correct Answer)
D. Swimming in cold water

Explanation: **Explanation:** The primary pathophysiology of **Exercise-Induced Bronchoconstriction (EIB)** involves the loss of heat and moisture from the airway mucosa. When a person exercises, increased ventilation leads to the evaporation of airway surface liquid. This results in **hyperosmolality** of the airway lining and **mucosal cooling**, both of which trigger the release of inflammatory mediators (like leukotrienes and histamine) from mast cells, leading to bronchospasm. **Why "Swimming in hot water" is the correct answer:** Swimming in a warm, humid environment is the **least** likely activity to precipitate asthma. The air inhaled just above the water surface in a heated pool is saturated with moisture and is warm. This prevents both mucosal dehydration and cooling, thereby inhibiting the trigger for EIB. **Analysis of other options:** * **Cycling in cold weather:** Cold air holds very little moisture. Rapidly breathing dry, cold air significantly accelerates heat and water loss from the airways, making it a potent trigger. * **High altitude climb:** Air at high altitudes is characteristically cold and extremely dry. The increased respiratory rate required for climbing further exacerbates airway drying. * **Swimming in cold water:** While swimming is generally less asthmogenic than running, doing so in cold water involves inhaling cold air, which can still trigger bronchoconstriction despite the ambient humidity. **NEET-PG High-Yield Pearls:** * **Diagnosis:** A drop in **FEV1 of ≥10%** (some guidelines say 12-15%) during a standardized exercise challenge or bronchial provocation test (e.g., Methacholine challenge) [1]. * **Refractory Period:** About 50% of patients experience a "refractory period" for 1-4 hours after an episode, where a second exercise bout causes less bronchoconstriction. * **Management:** **SABA (Salbutamol)** taken 15-30 minutes before exercise is the first-line prophylactic treatment. Warm-up exercises also help reduce the severity of the attack [1].

Question 212: What is the most common cause of empyema?

A. Bronchopleural fistula
B. Tubercular pneumonia
C. Bacterial pneumonia (Correct Answer)
D. Pleurisy

Explanation: **Explanation:** **1. Why Bacterial Pneumonia is Correct:** Empyema thoracis is defined as the presence of pus in the pleural space. The most common underlying cause is the direct spread of infection from an adjacent lung parenchyma, specifically **parapneumonic effusion** complicating **bacterial pneumonia** [1]. Approximately 40% of patients with bacterial pneumonia develop an associated pleural effusion; if left untreated or if the bacterial load is high, this fluid becomes infected (fibrinopurulent stage) and eventually progresses to frank pus (empyema) [1]. Common causative organisms include *Streptococcus pneumoniae*, *Staphylococcus aureus*, and anaerobes. **2. Why Other Options are Incorrect:** * **Bronchopleural fistula (A):** This is a *complication* of empyema or lung surgery rather than the most common primary cause [1]. While it can lead to empyema by allowing air and bacteria into the pleural space, it is statistically less frequent than pneumonia. * **Tubercular pneumonia (B):** While Tuberculosis is a major cause of pleural effusion in India, it usually presents as a serous exudate. Tuberculous empyema is a specific, chronic entity but is less common than pyogenic (bacterial) empyema globally. * **Pleurisy (D):** This refers to inflammation of the pleura, which causes chest pain [1]. It is a symptom or a clinical finding associated with various conditions (viral infections, PE, or pneumonia) but is not the causative mechanism of pus formation. **3. NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Thoracocentesis showing frank pus, a positive Gram stain/culture, or pleural fluid **pH < 7.2**, **LDH > 1000 U/L**, and **Glucose < 40 mg/dL** [1]. * **Stages of Empyema:** 1. Exudative stage, 2. Fibrinopurulent stage (loculations form), 3. Organizational stage (pleural peel forms). * **Management:** Prompt drainage (Intercostal Drainage tube) and appropriate antibiotics are the mainstays of treatment [1]. Chronic cases may require decortication.

Question 213: All are true regarding pneumoconioses EXCEPT:

A. Caplan's syndrome is seen in all types of pneumoconioses
B. 'Eggshell' calcification is seen in silicosis
C. Asbestosis is treated with corticosteroids
D. Centrilobular emphysema is seen in pneumoconioses (Correct Answer)

Explanation: The correct answer is **D**, as centrilobular emphysema is primarily associated with cigarette smoking, not pneumoconioses. While Coal Workers' Pneumoconiosis (CWP) can cause *focal* emphysema, the classic centrilobular pattern is the hallmark of tobacco-induced lung injury [1]. **Analysis of Options:** * **Option A (Caplan’s Syndrome):** This is a true statement in the context of medical exams. Caplan’s syndrome refers to the presence of necrobiotic (rheumatoid) nodules in the lungs of patients with both **Rheumatoid Arthritis** and any mineral dust inhalation (most commonly CWP, but also silicosis and asbestosis) [1]. * **Option B (Eggshell Calcification):** This is a classic radiological sign of **Silicosis**. It refers to the calcification of the periphery of hilar lymph nodes [1]. While highly characteristic of silicosis, it can rarely be seen in sarcoidosis. * **Option C (Asbestosis and Steroids):** This is generally considered **true** in a clinical/theoretical sense for exams, though its efficacy is limited. Like many interstitial lung diseases, corticosteroids are often trialed to manage inflammation, although the definitive treatment is supportive care and smoking cessation. * **Option D (Centrilobular Emphysema):** This is the **incorrect** statement. Pneumoconioses typically lead to restrictive lung disease and fibrosis [1][2]. Centrilobular emphysema specifically affects the respiratory bronchioles in the upper lobes and is the pathological signature of **smoking**. **High-Yield Clinical Pearls for NEET-PG:** * **Silicosis:** Increases the risk of **Tuberculosis** (due to impaired macrophage function). * **Asbestosis:** Most common malignancy is **Bronchogenic Carcinoma**; most specific malignancy is **Mesothelioma** [2]. * **Berylliosis:** Mimics Sarcoidosis (non-caseating granulomas) and is seen in aerospace/electronics workers [1]. * **Ferruginous bodies:** Golden-brown fusiform rods seen in asbestosis (Prussian blue stain) [2].

Question 214: Bronchiectasis means which of the following changes in the bronchi?

A. Inflammation
B. Dilatation (Correct Answer)
C. Cavitation
D. All of the above

Explanation: **Explanation:** **Bronchiectasis** is defined as the **permanent and abnormal dilatation** of the bronchi and bronchioles [1]. This occurs due to the destruction of the muscular and elastic components of the bronchial walls, usually resulting from a cycle of chronic infection and inflammation (Cole’s "Vicious Cycle" hypothesis). * **Why Option B is Correct:** The hallmark pathological feature of bronchiectasis is the irreversible widening (dilatation) of the airways [1]. This leads to impaired mucociliary clearance, causing mucus to pool, which further predisposes the patient to recurrent infections [2]. * **Why Option A is Incorrect:** While inflammation is a key part of the *pathogenesis* (the process that leads to the disease), it is not the definition of the disease itself. Many conditions involve inflammation (e.g., bronchitis, asthma) without causing the structural dilatation seen in bronchiectasis. * **Why Option C is Incorrect:** Cavitation refers to the formation of a gas-filled space within a zone of pulmonary consolidation or a nodule (commonly seen in TB or lung abscess). While bronchiectasis can coexist with cavitary lesions, it is a tubular or cystic widening of existing airways, not the creation of new parenchymal cavities. **High-Yield Clinical Pearls for NEET-PG:** 1. **Clinical Triad:** Chronic cough, copious foul-smelling purulent sputum, and hemoptysis [1]. 2. **Gold Standard Investigation:** **HRCT (High-Resolution CT)** of the chest. 3. **Radiological Signs:** Look for the **"Signet Ring Sign"** (bronchus diameter > accompanying pulmonary artery) and **"Tram-track appearance"** (parallel thickened bronchial walls) [1]. 4. **Most Common Cause (Global):** Post-infectious (e.g., Tuberculosis, Measles, Pertussis) [2]. 5. **Specific Associations:** Kartagener Syndrome (Situs inversus + Bronchiectasis + Sinusitis) and Cystic Fibrosis (most common cause in the West) [2].

Question 215: Lower lung involvement is common in which of the following conditions?

A. Tuberculosis
B. Asbestosis (Correct Answer)
C. Silicosis
D. All of the above

Explanation: In pulmonology, the anatomical distribution of lung disease is a high-yield concept often tested via the "Upper vs. Lower Lobe" distinction. **1. Why Asbestosis is Correct:** Asbestosis is a form of pneumoconiosis caused by the inhalation of asbestos fibers. Unlike most other inorganic dusts, asbestos fibers preferentially deposit in the **lower lobes** and subpleural regions [1]. This is attributed to the gravity-dependent nature of fiber clearance and higher blood flow/ventilation in the lung bases. Over time, this leads to bibasilar end-inspiratory crackles [1] and characteristic pleural plaques. **2. Why the Other Options are Incorrect:** * **Tuberculosis (Option A):** Post-primary (reactivation) TB classically involves the **apical and posterior segments of the upper lobes**. This is because *Mycobacterium tuberculosis* is an obligate aerobe that thrives in the higher oxygen tension (higher V/Q ratio) found at the lung apices. * **Silicosis (Option C):** This pneumoconiosis typically involves the **upper lobes** [1]. It presents with small, rounded opacities and "eggshell calcification" of the hilar lymph nodes [1]. **Clinical Pearls for NEET-PG:** To remember the distribution of interstitial lung diseases (ILD) and pneumoconiosis, use these mnemonics: * **Upper Lobe Involvement (SET CHAI):** * **S**ilicosis * **E**xtrinsic Allergic Alveolitis (Hypersensitivity Pneumonitis - chronic) * **T**uberculosis * **C**oal Worker’s Pneumoconiosis [1] * **H**istiocytosis X (Langerhans Cell Histiocytosis) * **A**nkylosing Spondylitis * **I**diopathic Pulmonary Fibrosis (Exception: IPF is lower lobe; this mnemonic refers to Sarcoidosis/others). *Correction: Use **BREAST** for Upper Lobe: Berylliosis, Radiation, EAA, Ankylosing Spondylitis, Sarcoidosis, TB/Silicosis.* * **Lower Lobe Involvement (BAD):** * **B**ronchiectasis * **A**sbestosis [1] * **D**IP/IPF (Idiopathic Pulmonary Fibrosis)

Question 216: Caplan's syndrome is seen in which of the following conditions?

A. COPD
B. Pneumoconiosis (Correct Answer)
C. Pulmonary edema
D. Bronchial asthma

Explanation: **Explanation:** **Caplan’s Syndrome** (also known as Rheumatoid Pneumoconiosis) is a clinical entity characterized by the coexistence of **Rheumatoid Arthritis (RA)** and **Pneumoconiosis**, most commonly seen in coal miners (Coal Worker's Pneumoconiosis) [1]. 1. **Why Pneumoconiosis is correct:** The syndrome manifests as multiple, well-defined "Caplan nodules" (0.5 to 5 cm in diameter) in the periphery of the lungs. These nodules develop rapidly in patients with a background of inorganic dust exposure (coal, silica, or asbestos) who also have or will develop rheumatoid arthritis [1, 3]. The underlying pathophysiology involves an exaggerated inflammatory response to dust particles in an individual with a pre-existing hyper-reactive immune system (rheumatoid diathesis) [2]. 2. **Why other options are incorrect:** * **COPD:** Characterized by chronic airflow obstruction (emphysema/bronchitis) due to smoking or biomass fuel; it does not typically present with rheumatoid-associated nodules. * **Pulmonary Edema:** This is a result of fluid accumulation in the alveoli (usually due to heart failure), presenting with diffuse opacities and Kerley B lines, not discrete nodules. * **Bronchial Asthma:** An inflammatory airway disease causing reversible bronchoconstriction; it does not involve the lung parenchyma or dust-related nodule formation [1, 5]. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Pneumoconiosis + Rheumatoid Arthritis + Multiple Pulmonary Nodules [1, 3]. * **Radiology:** Nodules are typically bilateral, peripheral, and may undergo cavitation or calcification [1]. * **Most Common Dust:** Coal dust is the most frequent association, but it can also occur with **Silicosis** and **Asbestosis** [1]. * **Distinction:** Unlike Progressive Massive Fibrosis (PMF), Caplan nodules can appear even with minimal dust exposure and often precede the onset of joint symptoms [2].

Question 217: A 60-year old male with a long-standing history of breathlessness and a heavy smoking history since age 20 presents with an anxious, emaciated appearance, puffing for breath without cyanosis, and a barrel-shaped chest. What is the investigation of choice for this patient?

A. High-resolution CT (Correct Answer)
B. Contrast-enhanced CT
C. Plain skiagram of the chest
D. Ultrasound test

Explanation: ### Explanation **Clinical Diagnosis: Emphysema (Pink Puffer)** The patient presents with classic features of **Emphysema**: a history of heavy smoking [4], an emaciated appearance (due to high work of breathing), "pink puffing" (maintaining oxygenation through hyperventilation, hence no cyanosis), and a barrel chest (hyperinflation). **1. Why High-Resolution CT (HRCT) is the Correct Answer:** While Pulmonary Function Tests (PFTs) are the gold standard for diagnosing COPD, **HRCT is the investigation of choice for characterizing the type and extent of emphysema.** It is highly sensitive in detecting structural changes like bullae, centrilobular or panacinar destruction, and distal acinar changes that are often missed on conventional imaging [1]. In the context of "investigation of choice" for structural lung parenchyma evaluation in emphysema, HRCT is superior [1]. **2. Why Other Options are Incorrect:** * **B. Contrast-enhanced CT (CECT):** This is primarily used to evaluate vascular structures (e.g., pulmonary embolism) or mediastinal masses. It is not required for the diagnosis of emphysema as the contrast does not improve the visualization of air-filled alveolar spaces. * **C. Plain Skiagram (Chest X-ray):** While often the *initial* investigation, it lacks sensitivity [2]. It only shows signs of hyperinflation (flattened diaphragm, increased retrosternal space) in advanced stages. * **D. Ultrasound:** USG is useful for pleural effusions or pneumothorax but cannot evaluate the lung parenchyma effectively due to air interference. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pink Puffers (Emphysema):** High V/Q ratio, thin/emaciated, minimal cough, hyperinflated chest. * **Blue Bloaters (Chronic Bronchitis):** Low V/Q ratio, cyanotic, productive cough, peripheral edema (cor pulmonale). * **Centriacinar Emphysema:** Most common type in smokers; affects upper lobes. * **Panacinar Emphysema:** Associated with Alpha-1 Antitrypsin deficiency; affects lower lobes. * **Gold Standard for COPD Diagnosis:** Spirometry (FEV1/FVC < 0.70 post-bronchodilator) [3].

Question 218: Which of the following are non-metastatic manifestations of carcinoma of the lung?

A. Cushing syndrome (Correct Answer)
B. Diabetes mellitus
C. Carcinoid syndrome
D. Jaundice

Explanation: **Explanation:** The question refers to **Paraneoplastic Syndromes (PNS)**, which are signs and symptoms occurring at sites distant from a tumor or its metastasis [1]. These are "non-metastatic" manifestations caused by the ectopic production of hormones, peptides, or cytokines by tumor cells [4]. **Why Cushing Syndrome is Correct:** Cushing syndrome is a classic paraneoplastic manifestation of **Small Cell Lung Carcinoma (SCLC)** [1]. It occurs due to the ectopic production of **ACTH (Adrenocorticotropic Hormone)** [3]. This leads to bilateral adrenal hyperplasia and excess cortisol production, presenting clinically with hypertension, hypokalemia, and metabolic alkalosis (often more rapidly progressive than pituitary-based Cushing’s). **Analysis of Incorrect Options:** * **Diabetes Mellitus:** While chronic steroid excess (from Cushing’s) can cause secondary hyperglycemia, DM itself is not considered a specific paraneoplastic syndrome of lung cancer. * **Carcinoid Syndrome:** Although bronchial carcinoids exist, classic carcinoid syndrome (flushing, diarrhea) is rare unless there are massive liver metastases. It is not a standard paraneoplastic feature of primary lung adenocarcinoma or squamous cell carcinoma. * **Jaundice:** This is typically a **metastatic** manifestation, occurring due to liver involvement (hepatic metastases) or biliary obstruction, rather than a paraneoplastic process [2]. **NEET-PG High-Yield Pearls:** 1. **Small Cell Carcinoma (SCLC):** Associated with ACTH (Cushing’s), SIADH (hyponatremia), and Lambert-Eaton Myasthenic Syndrome [4]. 2. **Squamous Cell Carcinoma:** Associated with **PTHrP** (Parathyroid Hormone-related Protein) leading to **Hypercalcemia**. (Mnemonic: **S**quamous = **S**tones/Calcium) [1]. 3. **Adenocarcinoma:** Associated with Hypertrophic Osteoarthropathy (HOA) and Digital Clubbing [2]. 4. **Large Cell Carcinoma:** Associated with Gynecomastia.

Question 219: Cavitation is most often seen in which type of pneumonia?

A. Mycoplasma pneumonia
B. Tuberculous pneumonia (Correct Answer)
C. Streptococcal pneumonia
D. Staphylococcal pneumonia

Explanation: **Explanation:** **Correct Answer: B. Tuberculous pneumonia** Cavitation is a hallmark of **Tuberculous pneumonia**, particularly in post-primary (reactivation) tuberculosis [1]. The underlying mechanism is **caseous necrosis**, where a cell-mediated immune response (Type IV hypersensitivity) leads to tissue destruction [1]. When this necrotic material liquefies and drains into the bronchial tree, it leaves behind a gas-filled cavity. These cavities are typically thick-walled and located in the upper lobes (apical/posterior segments) due to higher oxygen tension [1], [4]. **Analysis of Incorrect Options:** * **A. Mycoplasma pneumonia:** Known as "Atypical Pneumonia," it typically presents with interstitial infiltrates and "reticulonodular" patterns. Cavitation is extremely rare. * **C. Streptococcal pneumonia:** *Streptococcus pneumoniae* is the most common cause of community-acquired pneumonia (lobar pattern). It is non-necrotizing; therefore, it rarely causes cavitation or permanent lung scarring [3]. * **D. Staphylococcal pneumonia:** While *Staphylococcus aureus* is a well-known cause of necrotizing pneumonia and can cause **pneumatoceles** (thin-walled, air-filled cysts) or abscesses, it is statistically less frequent than Tuberculosis in the context of chronic cavitary lesions in the Indian subcontinent. **NEET-PG High-Yield Pearls:** * **Most common cause of cavitation globally:** Tuberculosis [1]. * **Most common cause of cavitation in Acute Pneumonia:** *Staphylococcus aureus* and *Klebsiella pneumoniae* (Friedlander’s pneumonia). * **Pneumatoceles:** Characteristically seen in Pediatric Staphylococcal pneumonia. * **Air-fluid levels:** If seen within a cavity, suspect a lung abscess or superinfected TB cavity [2], [4]. * **Bulging Fissure Sign:** Classically associated with *Klebsiella* pneumonia.

Question 220: Which of the following conditions can present with necrotic lung nodules on chest X-ray?

A. Tuberculosis (TB)
B. Rheumatoid Arthritis (RA)
C. Sarcoidosis
D. All of the above (Correct Answer)

Explanation: **Explanation:** The presence of **necrotic (cavitating) lung nodules** on imaging is a significant clinical finding that narrows the differential diagnosis to specific infectious, inflammatory, and neoplastic processes. 1. **Tuberculosis (TB):** This is the most common cause of necrotic lung lesions in India. TB typically causes **caseating necrosis**. While classic TB presents as upper lobe infiltrates with cavitation, it can also manifest as multiple nodules that undergo central necrosis and cavitation, especially in post-primary TB or immunocompromised states. [1] 2. **Rheumatoid Arthritis (RA):** Pulmonary involvement in RA can manifest as **necrobiotic nodules**. These are pathologically identical to subcutaneous nodules (central fibrinoid necrosis surrounded by palisading macrophages). They are typically peripheral, multiple, and frequently undergo cavitation (Caplan’s Syndrome when associated with coal worker's pneumoconiosis). [2] 3. **Sarcoidosis:** Although sarcoidosis is characterized by **non-caseating granulomas**, a rare variant known as **"Necrotizing Sarcoid Granulomatosis" (NSG)** exists. In this form, the granulomatous nodules undergo extensive necrosis and can appear as cavitating nodules on a chest X-ray. [1] **Clinical Pearls for NEET-PG:** * **Mnemonic for Cavitating Lung Lesions (CAVITY):** **C**ancer (SCC), **A**utoimmune (Wegener’s/GPA, RA), **V**ascular (Septic emboli), **I**nfection (TB, Fungal/Aspergillosis, Abscess), **T**rauma, **Y**outh (CPAM/Sequestration). * **Squamous Cell Carcinoma** is the most common bronchogenic carcinoma to cavitate. [1] * **Granulomatosis with Polyangiitis (Wegener’s)** is a high-yield differential for multiple bilateral necrotic nodules associated with renal involvement (c-ANCA positive). [1]

Practice by Chapter

Obstructive Airway Diseases (Asthma, COPD)

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Interstitial Lung Diseases

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Pulmonary Infections

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Pulmonary Vascular Diseases

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Pleural Diseases

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Sleep-Disordered Breathing

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Respiratory Failure

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Mediastinal Disorders

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Occupational Lung Diseases

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Pulmonary Function Testing

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Bronchiectasis and Cystic Fibrosis

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Lung Cancer Approach

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