Pulmonology — MCQs

Pulmonology Indian Medical PG Practice Questions and MCQs

Question 101: All of the following conditions are associated with clubbing except?

A. Bronchogenic carcinoma
B. Chronic bronchitis (Correct Answer)
C. Empyema
D. Bronchiectasis

Explanation: Digital clubbing is a clinical sign characterized by the focal enlargement of the connective tissue in the terminal phalanges. The key to answering this question lies in understanding that **clubbing is typically absent in uncomplicated COPD (Chronic Bronchitis and Emphysema) [3].** **1. Why Chronic Bronchitis is the correct answer:** In chronic bronchitis, despite chronic hypoxia, clubbing does not occur. If a patient with known COPD develops clubbing, a clinician must immediately investigate for an underlying complication, most commonly **Bronchogenic Carcinoma** or secondary **Bronchiectasis** [2], [3]. **2. Analysis of incorrect options (Conditions where clubbing IS seen):** * **Bronchogenic Carcinoma (Option A):** This is the most common neoplastic cause of clubbing [1]. It is often associated with Hypertrophic Osteoarthropathy (HOA). * **Empyema (Option B):** Chronic suppurative lung diseases are classic causes of clubbing [1]. The release of growth factors (like PDGF and VEGF) from platelet precursors in the nail bed is triggered by the inflammatory process. * **Bronchiectasis (Option D):** Similar to empyema, the chronic suppuration and inflammation in the dilated airways lead to significant clubbing [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Schamroth’s Sign:** Loss of the normal diamond-shaped window between the nail beds when fingers are opposed (earliest sign). * **Lovibond’s Angle:** The angle between the nail base and the adjacent skin; it exceeds 180° in clubbing. * **Differential Diagnosis Tip:** * **Respiratory:** Lung cancer, Bronchiectasis, Empyema, Lung Abscess, Cystic Fibrosis, Idiopathic Pulmonary Fibrosis (IPF) [1], [3]. * **Cardiac:** Cyanotic Congenital Heart Disease (e.g., TOF), Subacute Bacterial Endocarditis (SBE) [1]. * **GI:** Crohn’s disease, Ulcerative Colitis, Cirrhosis [1]. * **Unilateral Clubbing:** Think of Axillary artery aneurysm or Brachial plexus injury.

Question 102: Serum angiotensin converting enzyme may be raised in all of the following conditions, except?

A. Sarcoidosis
B. Silicosis
C. Berylliosis
D. Bronchogenic carcinoma (Correct Answer)

Explanation: ### Explanation **Concept:** Serum Angiotensin-Converting Enzyme (SACE) is produced by **epithelioid cells and macrophages** within granulomas. Therefore, SACE levels are typically elevated in various **granulomatous diseases** and certain metabolic disorders, but not typically in primary lung malignancies. **Why Bronchogenic Carcinoma is the correct answer:** Bronchogenic carcinoma is a neoplastic condition, not a granulomatous one [1]. While some paraneoplastic syndromes occur with lung cancer, elevated SACE is not a recognized marker for this condition [1]. Its primary utility lies in monitoring the activity of granulomatous inflammation. **Analysis of Incorrect Options:** * **Sarcoidosis:** This is the classic cause [2]. SACE is elevated in about 60-80% of patients with active sarcoidosis and is used to monitor disease activity and response to steroid therapy [2]. * **Silicosis:** Chronic inhalation of silica particles leads to the formation of silicotic nodules (a type of granuloma), which can cause a rise in SACE levels [3]. * **Berylliosis:** Chronic Beryllium Disease (CBD) is a granulomatous lung disease that clinically and histologically mimics sarcoidosis, frequently leading to elevated SACE [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Other causes of raised SACE:** Gaucher’s disease (highest levels often seen here), Hyperthyroidism, Leprosy, Histoplasmosis, and Liver Cirrhosis. * **False Low SACE:** Patients taking **ACE inhibitors** (e.g., Enalapril, Ramipril) will have falsely low SACE levels, which can mask underlying sarcoidosis activity. * **SACE Sensitivity:** While SACE is high-yield for exams, it has low specificity; it is better for **monitoring** sarcoidosis rather than initial diagnosis.

Question 103: Well's grading of pulmonary embolism is based on which of the following criteria?

A. Doppler
B. Clinical symptoms
C. Hemoptysis
D. Heart Rate > 100 beats per min (Correct Answer)

Explanation: The **Wells' Criteria** (or Wells’ Score) is a clinical prediction rule used to estimate the pre-test probability of Pulmonary Embolism (PE). It is designed to help clinicians decide whether further diagnostic imaging (like CTPA) is necessary. ### Why Option D is Correct **Heart Rate > 100 beats per minute** is one of the seven specific clinical variables included in the Wells' Score [2]. Tachycardia is a common physiological response to the increased pulmonary vascular resistance and hypoxemia associated with PE [1]. In the scoring system, a heart rate > 100 bpm is assigned **1.5 points**. ### Why Other Options are Incorrect * **A. Doppler:** While Lower Limb Venous Doppler (USG) is used to diagnose DVT, it is a **diagnostic investigation**, not a clinical criterion within the Wells' scoring system itself [3]. * **B. Clinical symptoms:** This is too vague. While the Wells' score is based on clinical findings, "clinical symptoms" is not a specific criterion. The score requires specific findings like "Signs and symptoms of DVT" (3 points) [4]. * **C. Hemoptysis:** While hemoptysis is a component of the Wells' score (1 point), it is less frequently tested than tachycardia. In the context of this specific question, Option D is the standard "textbook" answer for identifying specific physiological parameters in the score. ### High-Yield Clinical Pearls for NEET-PG * **Wells' Score Components:** 1. Clinical signs/symptoms of DVT (3 pts) 2. PE is #1 diagnosis or equally likely (3 pts) 3. Heart rate > 100 bpm (1.5 pts) 4. Immobilization (>3 days) or Surgery (within 4 weeks) (1.5 pts) 5. Previous DVT/PE (1.5 pts) 6. Hemoptysis (1 pt) 7. Malignancy (1 pt) * **Interpretation:** A score **> 4** indicates PE is likely (perform CTPA); a score **≤ 4** indicates PE is unlikely (perform D-dimer to rule out). * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA) [3]. * **Most Common ECG Finding:** Sinus Tachycardia (S1Q3T3 is specific but less common) [1].

Question 104: What is the most common cause of obstructive lung disease?

A. Smoking (Correct Answer)
B. Air pollution
C. Genetic predisposition
D. Occupational exposure

Explanation: **Explanation:** Obstructive lung diseases, primarily Chronic Obstructive Pulmonary Disease (COPD), are characterized by airflow limitation that is not fully reversible. **1. Why Smoking is Correct:** Cigarette smoking is the **single most important risk factor** and the most common cause of obstructive lung disease worldwide [1]. It triggers a chronic inflammatory response in the airways (chronic bronchitis) and causes destruction of the alveolar walls (emphysema) through an imbalance of proteases and anti-proteases. In clinical practice, approximately 80-90% of COPD cases are directly attributable to long-term tobacco use. **2. Why Other Options are Incorrect:** * **Air Pollution:** While indoor (biomass fuel) and outdoor pollution are significant contributors, especially in developing countries, they remain secondary to smoking on a global scale [1]. * **Genetic Predisposition:** The most well-known genetic cause is **Alpha-1 Antitrypsin Deficiency (AATD)**. However, this accounts for less than 1-3% of all COPD cases. * **Occupational Exposure:** Exposure to organic/inorganic dusts and chemical fumes (e.g., coal mining, silica) is a recognized cause but is statistically less common than smoking-induced disease. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Spirometry is required; a post-bronchodilator **FEV1/FVC ratio < 0.70** confirms persistent airflow limitation. * **Reversibility:** Asthma is an obstructive disease characterized by *reversible* airflow obstruction, whereas COPD is *irreversible/persistent*. * **Centriacinar Emphysema:** This pattern is most commonly associated with **smoking** (affects upper lobes). * **Panacinar Emphysema:** This pattern is classically seen in **Alpha-1 Antitrypsin Deficiency** (affects lower lobes).

Question 105: A 20-year-old male presents with acute respiratory distress and tachypnea. His BP is 90/60. Loud P2 is present. What is true about his condition?

A. D-dimer assay should be done.
B. S wave in lead I and Q wave in lead III of ECG is seen.
C. Streptokinase should be given.
D. All of the above. (Correct Answer)

Explanation: This patient presents with a classic triad of **Massive Pulmonary Embolism (PE)**: acute respiratory distress, signs of right heart strain (loud P2), and hemodynamic instability (hypotension, BP 90/60 mmHg) [1]. ### **Detailed Explanation** 1. **Diagnosis (Massive PE):** The presence of hypotension (Systolic BP <90 mmHg) categorizes this as a **Massive (High-risk) PE**. This is a medical emergency requiring immediate intervention. 2. **Option A (D-dimer):** While D-dimer has a high negative predictive value (useful for ruling out PE in low-risk patients), it is often elevated in confirmed cases. However, in clinical practice, for a high-probability case, imaging is prioritized [2]. 3. **Option B (S1Q3T3 Pattern):** This is the classic ECG sign of acute cor pulmonale (right heart strain) [1]. It consists of a deep **S wave in Lead I**, a **Q wave in Lead III**, and an **inverted T wave in Lead III**. While not pathognomonic, it is a high-yield finding for exams. 4. **Option C (Thrombolysis):** This is the most critical step. According to current guidelines, **hemodynamic instability (hypotension)** is an absolute indication for systemic thrombolysis with agents like **Streptokinase**, Alteplase, or Tenecteplase to rapidly dissolve the clot and restore perfusion [3]. ### **NEET-PG High-Yield Pearls** * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA) [2]. * **Most Common ECG Finding:** Sinus tachycardia (S1Q3T3 is specific but less common) [1]. * **Most Common Symptom:** Dyspnea; **Most Common Sign:** Tachypnea. * **Management Strategy:** * *Stable patient:* Anticoagulation (Heparin/LMWH). * *Unstable patient (Hypotension):* Thrombolysis (Streptokinase) [3]. * **Chest X-ray signs:** Westermark sign (focal oligemia) and Hampton’s Hump (wedge-shaped opacity) [1].

Question 106: Barrel chest is usually associated with which of the following conditions?

A. Chronic bronchitis (Correct Answer)
B. Left heart failure
C. Anasarca
D. Perforated lung

Explanation: **Explanation:** **Barrel chest** refers to a clinical sign where the anteroposterior (AP) diameter of the chest increases, making it equal to or greater than the lateral diameter (normal ratio is 0.70 to 0.75). **Why Chronic Bronchitis is correct:** Chronic Bronchitis, along with Emphysema, falls under the umbrella of **Chronic Obstructive Pulmonary Disease (COPD)** [1]. The underlying pathophysiology involves chronic airflow obstruction and **air trapping**. As air becomes trapped in the alveoli during expiration, the lungs become chronically hyperinflated. To accommodate this increased volume, the rib cage remains in a partially expanded state, leading to the characteristic "barrel" shape. While more classically associated with the "Pink Puffer" (emphysema) phenotype, it is a hallmark finding across the COPD spectrum, including chronic bronchitis [3]. **Why other options are incorrect:** * **Left Heart Failure:** Typically presents with pulmonary edema and pleural effusion [4]. It leads to restrictive patterns rather than hyperinflation [2]. * **Anasarca:** This is generalized massive edema. While it may cause skin thickening or pleural effusions, it does not structurally alter the bony thoracic cage into a barrel shape. * **Perforated Lung (Pneumothorax):** While a tension pneumothorax can cause unilateral chest expansion and tracheal shift, it is an acute event and does not result in the chronic, bilateral remodeling seen in a barrel chest. **High-Yield Clinical Pearls for NEET-PG:** * **AP:Lateral Ratio:** In barrel chest, the ratio is **1:1**. * **Radiology:** On a lateral X-ray, look for an increased **retrosternal air space** (>2.5 cm) and flattening of the diaphragmatic domes. * **Percussion:** The chest will be **hyper-resonant** due to increased air-to-tissue ratio. * **Hoover’s Sign:** Paradoxical inward movement of the lower costal margins during inspiration, often seen in severe hyperinflation/COPD.

Question 107: What is the least common cause of clubbing among the following?

A. Adenocarcinoma
B. Squamous cell cancer
C. Small cell cancer (Correct Answer)
D. Mesothelioma

Explanation: **Explanation:** Digital clubbing is a clinical sign characterized by the focal bulbous enlargement of the terminal phalanges. In the context of thoracic malignancies, it is most frequently associated with non-small cell lung cancers (NSCLC). [1] **Why Small Cell Lung Cancer (SCLC) is the correct answer:** Small cell lung cancer is a neuroendocrine tumor that typically presents as a central, rapidly growing mass. Despite its aggressive nature, it is **least commonly** associated with digital clubbing. Instead, SCLC is classically associated with various paraneoplastic syndromes like SIADH, ectopic ACTH production, and Lambert-Eaton Myasthenic Syndrome. [2], [3] **Analysis of Incorrect Options:** * **Adenocarcinoma:** This is the most common type of lung cancer associated with clubbing and Hypertrophic Osteoarthropathy (HOA). [1] Its peripheral location is thought to facilitate the bypass of pulmonary capillary filtration of platelet-derived growth factor (PDGF) and VEGF, leading to distal changes. * **Squamous Cell Cancer:** As a member of the NSCLC family, it is significantly more likely to cause clubbing than SCLC, though less frequently than adenocarcinoma. * **Mesothelioma:** This pleural malignancy is strongly associated with digital clubbing, occurring in approximately 40-50% of cases. **High-Yield Clinical Pearls for NEET-PG:** * **Most common lung cancer associated with clubbing:** Adenocarcinoma. * **Most common cause of clubbing overall:** Cyanotic congenital heart disease (in children) and Lung Cancer (in adults). [1] * **HOA Triad:** Clubbing, periostitis of long bones, and arthritis/synovitis. [1] * **Pathophysiology:** The most accepted theory involves megakaryocytes bypassing the lung capillary bed and releasing PDGF/VEGF in the systemic circulation, causing fibrovascular proliferation.

Question 108: Which of the following statements regarding COPD is true?

A. Decreased FEV1
B. Increased RV
C. Diffusion capacity is decreased
D. All of the above (Correct Answer)

Explanation: Chronic Obstructive Pulmonary Disease (COPD) is characterized by persistent airflow limitation and structural lung changes. The correct answer is **"All of the above"** because COPD affects lung mechanics and gas exchange in the following ways: 1. **Decreased FEV1 (Option A):** This is the hallmark of obstructive lung disease. Chronic inflammation and airway narrowing (bronchiolitis) increase resistance, leading to a reduced Forced Expiratory Volume in 1 second (FEV1) and a decreased FEV1/FVC ratio (<0.70) [1]. 2. **Increased RV (Option B):** Due to loss of elastic recoil (in emphysema) and premature airway closure during expiration, air becomes trapped in the distal airspaces. This leads to **hyperinflation**, which manifests as an increased Residual Volume (RV) and Total Lung Capacity (TLC) [1]. 3. **Decreased Diffusion Capacity (Option C):** In the emphysematous phenotype of COPD, there is permanent destruction of the alveolar-capillary membrane. This reduction in surface area for gas exchange leads to a decreased **DLCO** (Diffusing Capacity of the Lungs for Carbon Monoxide). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Spirometry is essential; a post-bronchodilator FEV1/FVC ratio < 0.7 confirms persistent airflow limitation [1]. * **Pink Puffers vs. Blue Bloaters:** Emphysema (Pink Puffers) shows significant DLCO reduction, whereas Chronic Bronchitis (Blue Bloaters) may have a relatively normal DLCO [2]. * **Flow-Volume Loop:** Shows a characteristic **"scooped-out"** appearance during the expiratory phase [1]. * **Management:** Smoking cessation is the most effective intervention to slow the decline in FEV1. Long-term oxygen therapy (LTOT) and lung volume reduction surgery are the only interventions proven to improve survival in selected patients.

Question 109: Which of the following statements is true regarding non-specific interstitial pneumonia?

A. Honeycombing is seen on CT scan.
B. It predominantly affects males.
C. It affects the elderly age group.
D. It has a good prognosis. (Correct Answer)

Explanation: **Explanation:** Non-specific Interstitial Pneumonia (NSIP) is a distinct pattern of idiopathic interstitial pneumonia that is crucial to differentiate from Usual Interstitial Pneumonia (UIP/IPF) due to its significantly better clinical outcome. **1. Why Option D is Correct:** NSIP has a **good prognosis**, especially when compared to Idiopathic Pulmonary Fibrosis (IPF) [1]. It is highly responsive to corticosteroids and immunosuppressive therapy. The 5-year survival rate for NSIP is approximately 80-100%, whereas for IPF, it is only 30-50%. **2. Why the other options are incorrect:** * **Option A:** Honeycombing is a hallmark of **UIP/IPF** [1]. In NSIP, the characteristic HRCT finding is **Ground Glass Opacities (GGO)**, usually bilateral and symmetrical, with subpleural sparing. While traction bronchiectasis may occur in fibrotic NSIP, true honeycombing is rare. * **Option B:** Unlike IPF (which favors males), NSIP **predominantly affects females** and is the most common interstitial lung disease pattern seen in patients with connective tissue diseases (CTD) like Scleroderma [1]. * **Option C:** NSIP typically affects a **younger age group** (40–50 years) compared to IPF, which is a disease of the elderly (usually >65 years) [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Subpleural Sparing:** This is the most specific HRCT sign for NSIP. * **Histology:** Characterized by **temporal homogeneity** (all lesions are of the same age), unlike the temporal heterogeneity seen in UIP (fibroblastic foci). * **Associations:** Always screen for **Connective Tissue Diseases (CTD)** in a patient with an NSIP pattern [1]. * **Subtypes:** Cellular NSIP (better prognosis) and Fibrotic NSIP.

Question 110: A 44-year-old man with a history of chronic bronchitis is admitted with severe shortness of breath and left-sided chest pain. CXR shows left ventricular strain on EKG. What is the most likely diagnosis to explain the symptoms?

A. Pneumothorax (Correct Answer)
B. COPD
C. Bulla
D. Subendocardial infarct

Explanation: ### **Explanation** **Correct Answer: A. Pneumothorax** The clinical presentation of sudden-onset shortness of breath and pleuritic chest pain in a patient with chronic bronchitis (a form of COPD) strongly suggests a **Secondary Spontaneous Pneumothorax (SSP)**. In patients with underlying lung disease, the rupture of subpleural blebs or bullae leads to the accumulation of air in the pleural space [2]. The key diagnostic clue here is the **EKG showing "left ventricular strain."** In a left-sided pneumothorax, the accumulation of air can cause a rightward mediastinal shift and insulation of the heart, leading to EKG changes that mimic ischemia or strain, such as axis deviation, T-wave inversions, or decreased R-wave voltage. --- ### **Why other options are incorrect:** * **B. COPD:** While the patient has a history of chronic bronchitis, an acute exacerbation of COPD typically presents with increased cough and sputum production rather than sudden pleuritic chest pain and specific EKG strain patterns [3]. * **C. Bulla:** A large emphysematous bulla can mimic a pneumothorax on CXR, but it usually develops slowly. It would not typically cause acute-onset severe distress or EKG strain unless it ruptures (becoming a pneumothorax). * **D. Subendocardial infarct:** While an MI can cause chest pain and EKG changes, it is less likely to be the primary cause of sudden shortness of breath in a patient with a clear pulmonary risk factor (chronic bronchitis) unless triggered by the hypoxia of a pulmonary event [1]. --- ### **NEET-PG High-Yield Pearls:** 1. **EKG in Pneumothorax:** Left-sided pneumothorax can cause **Right Axis Deviation**, reduced QRS voltage, and T-wave inversions in precordial leads (mimicking an MI). 2. **Secondary Spontaneous Pneumothorax (SSP):** Most commonly caused by **COPD/Emphysema**. It is more life-threatening than primary pneumothorax due to poor baseline pulmonary reserve [2]. 3. **Diagnosis:** The gold standard for acute diagnosis is a **Chest X-ray (Inspiratory film)** showing a visceral pleural line [1]; however, in emergencies, **Bedside Ultrasound (BLUE protocol)** showing the absence of "lung sliding" is faster. 4. **Management:** For SSP, a chest tube (intercostal drainage) is almost always required, regardless of the size of the pneumothorax.

Practice by Chapter

Obstructive Airway Diseases (Asthma, COPD)

Practice Questions

Interstitial Lung Diseases

Practice Questions

Pulmonary Infections

Practice Questions

Pulmonary Vascular Diseases

Practice Questions

Pleural Diseases

Practice Questions

Sleep-Disordered Breathing

Practice Questions

Respiratory Failure

Practice Questions

Mediastinal Disorders

Practice Questions

Occupational Lung Diseases

Practice Questions

Pulmonary Function Testing

Practice Questions

Bronchiectasis and Cystic Fibrosis

Practice Questions

Lung Cancer Approach

Practice Questions

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