Obstructive Pulmonary Diseases — MCQs
Which of the following is least likely to be associated with emphysema?
CT chest shows 'signet ring sign' with dilated bronchus and adjacent pulmonary artery. Which of these is LEAST likely?
Irreversible obstructive lung function is seen in which of the following conditions?
Which of the following is not a clinical feature of Bronchiectasis?
Aspirin sensitive asthma is associated with:
Central bronchiectasis is seen with
Most common cause of idiopathic interstitial pneumonia is
A CT scan shows the 'crazy paving' pattern in both lungs. Which bronchoalveolar lavage finding would confirm pulmonary alveolar proteinosis?
Among the following conditions, laparoscopy carries the highest risk in patients with:
X-ray chest in a neonate may show 'ground glass' haziness in all the following conditions EXCEPT:
Obstructive Pulmonary Diseases Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is least likely to be associated with emphysema?
- A. Associated with smoking
- B. Type I respiratory failure (Correct Answer)
- C. Barrel shaped chest
- D. Cyanosis
Explanation: **Type I respiratory failure** - **Emphysema** primarily causes **Type II respiratory failure** (hypercapnic) due to impaired gas exchange and CO2 retention resulting from alveolar destruction and air trapping [2][4]. - While hypoxemia can occur in severe emphysema, it is the more prominent **hypercapnia** that defines its typical respiratory failure pattern, making pure Type I less likely [3][4]. *Associated with smoking* - **Cigarette smoking** is the leading cause of emphysema, directly linked to the destruction of alveolar walls and loss of elastic recoil [1]. - The inhaled toxins trigger an inflammatory response in the lungs, leading to the release of proteases that break down lung tissue [1][2]. *Barrel shaped chest* - This is a classic sign of advanced emphysema, caused by **chronic air trapping** and subsequent hyperinflation of the lungs [2]. - The diaphragm flattens, and the ribs become more horizontal, increasing the anterior-posterior diameter of the chest. *Cyanosis* - Often seen in patients with severe emphysema (especially in a subgroup referred to as "blue bloaters" for chronic bronchitis overlap) due to **significant hypoxemia** [3]. - Impaired gas exchange leads to insufficient oxygenation of hemoglobin, causing a bluish discoloration of the skin and mucous membranes [3].
Question 2: CT chest shows 'signet ring sign' with dilated bronchus and adjacent pulmonary artery. Which of these is LEAST likely?
- A. ABPA
- B. Sarcoidosis (Correct Answer)
- C. Bronchiectasis
- D. Cystic fibrosis
Explanation: ***Sarcoidosis*** - While sarcoidosis can cause various pulmonary manifestations, **bronchiectasis with a "signet ring sign" is not a typical or primary feature**. It primarily causes **non-caseating granulomas**, often leading to lymphadenopathy and interstitial lung disease. - The disease's characteristic features are usually **hilar and mediastinal lymphadenopathy** and **pulmonary nodules or fibrosis**, not dilated bronchi. *ABPA* - **Allergic bronchopulmonary aspergillosis (ABPA)** commonly causes **bronchial obstruction and subsequent dilation**, leading to bronchiectasis that can manifest as a "signet ring sign" on CT. - It often involves **central bronchiectasis** with mucoid impaction, which is a key imaging finding in this condition. *Bronchiectasis* - **Bronchiectasis** is fundamentally defined by **permanent dilation of the bronchi**, which appears as a "signet ring sign" when a dilated bronchus is seen adjacent to a smaller accompanying pulmonary artery. - This finding is a **hallmark imaging feature** for diagnosing bronchiectasis, regardless of its underlying cause. *Cystic fibrosis* - **Cystic fibrosis** is a genetic disorder leading to thick, sticky mucus that obstructs airways and predisposes to recurrent infections, inevitably causing **widespread bronchiectasis**. - The **"signet ring sign" is a very common finding** in CT scans of patients with cystic fibrosis due to extensive bronchial dilation.
Question 3: Irreversible obstructive lung function is seen in which of the following conditions?
- A. Asthma
- B. COPD (Correct Answer)
- C. Pleural effusion
- D. Kyphoscoliosis
Explanation: ***COPD*** - **Chronic Obstructive Pulmonary Disease** (COPD) is characterized by **persistent airflow limitation** that is not fully reversible [3]. - This irreversibility is due to structural changes in the airways and parenchyma, including **emphysema** and **chronic bronchitis** [2]. *Asthma* - Asthma is characterized by **reversible airway obstruction** and hyperresponsiveness, often triggered by allergens or irritants [4]. - While it can be severe, the key distinguishing feature is that the airway limitation can be significantly reversed with bronchodilator treatment [1]. *Pleural effusion* - A pleural effusion involves the **accumulation of fluid in the pleural space**, which is outside the lung tissue. - This condition causes **restrictive lung disease** by compressing the lung, rather than obstructing the airways from within, and is usually treatable by drainage. *Kyphoscoliosis* - **Kyphoscoliosis** is a skeletal deformity of the spine that restricts lung expansion, leading to **restrictive lung disease**. - It does not directly cause an obstructive pattern within the airways, but rather impairs the mechanical ability of the lungs to inflate.
Question 4: Which of the following is not a clinical feature of Bronchiectasis?
- A. Hemoptysis
- B. Chest pain
- C. Night sweats (Correct Answer)
- D. Productive cough
Explanation: ***Night sweats*** - While **night sweats** can be present in chronic infections, they are not considered a primary or defining clinical feature directly associated with the pathology of bronchiectasis itself. - They are more commonly linked with systemic conditions like **tuberculosis** or malignancy, which would require alternative diagnostic pathways. *Hemoptysis* - **Hemoptysis** (coughing up blood) is a common and often alarming symptom of bronchiectasis due to the inflammation and damage to the bronchial walls and underlying vasculature [1]. - Blood vessels in damaged airways are prone to rupture, leading to bleeding, which can range from blood-streaked sputum to massive hemorrhage [1]. *Chest pain* - **Chest pain** can occur in bronchiectasis, often related to the chronic cough, pleural inflammation, or musculoskeletal strain from persistent coughing. - It can also be a symptom if there's an associated infection or inflammation extending to the pleura. *Productive cough* - A **chronic productive cough** with significant amounts of purulent sputum is the hallmark symptom of bronchiectasis [1]. - This is due to the impaired mucociliary clearance and chronic infection within the dilated, damaged airways .
Question 5: Aspirin sensitive asthma is associated with:
- A. Extrinsic asthma
- B. Associated with nasal polyp (Correct Answer)
- C. Obesity
- D. Usually associated with urticaria
Explanation: **Associated with nasal polyp** - **Aspirin-exacerbated respiratory disease (AERD)**, also known as aspirin-sensitive asthma, is characterized by a triad of **asthma**, **rhinosinusitis with nasal polyposis**, and respiratory reactions to **aspirin** and other NSAIDs [1]. - The presence of **nasal polyps** is a key clinical feature differentiating AERD from other forms of asthma [1]. *Obesity* - While **obesity** can exacerbate asthma severity, it is not specifically associated with the pathogenesis or diagnosis of **aspirin-sensitive asthma**. - It is a general risk factor for various health issues, including more severe asthma, but lacks specificity for AERD. *Extrinsic asthma* - **Extrinsic asthma** (allergic asthma) is typically triggered by environmental allergens and involves an **IgE-mediated response** [2]. - AERD is considered a **non-allergic** or **intrinsic asthma** phenotype, as it is not triggered by traditional allergens but by pharmacologic agents [1]. *Usually associated with urticaria* - **Urticaria** (hives) can be a feature of aspirin and NSAID sensitivity, particularly in some forms of **NSAID-induced urticaria/angioedema**. - However, the classic respiratory reactions of **aspirin-sensitive asthma** (bronchospasm, rhinitis) are distinct from urticarial reactions and typically do not present with primary urticaria.
Question 6: Central bronchiectasis is seen with
- A. Cystic fibrosis (Correct Answer)
- B. Tuberculosis
- C. Bronchogenic carcinoma
- D. Cystic Adenomatoid Malformation (CAM)
Explanation: ***Cystic fibrosis*** - **Cystic Fibrosis (CF)** is a genetic disorder commonly associated with **central bronchiectasis**, particularly affecting the upper lobes and central airways. - The abnormal mucus production in CF leads to chronic infection, inflammation, and eventual **dilation of the bronchi**, prominent in the central regions. *Bronchogenic carcinoma* - **Bronchogenic carcinoma** can cause **post-obstructive bronchiectasis** distal to the tumor due to airway obstruction and reduced clearance. - However, the bronchiectasis tends to be **localized** to the segment supplied by the obstructed bronchus, rather than being diffusely central. *Tuberculosis* - **Tuberculosis (TB)** can lead to bronchiectasis, often affecting the **upper lobes** and causing localized airway damage. - While TB can cause changes in the bronchi, it is typically linked with **focal or segmental bronchiectasis** resulting from inflammatory destruction, not diffuse central bronchiectasis like CF. *Cystic Adenomatoid Malformation (CAM)* - **Cystic Adenomatoid Malformation (CAM)** is a **congenital lung lesion** with abnormal airway development, but it does not primarily involve bronchiectasis. - CAM is characterized by **cystic structures** or abnormal lung tissue, not the permanent dilation of the bronchi seen in typical bronchiectasis.
Question 7: Most common cause of idiopathic interstitial pneumonia is
- A. Idiopathic pulmonary fibrosis (Correct Answer)
- B. Organizing pneumonia
- C. Sarcoidosis
- D. Lipoid pneumonia
Explanation: ***Idiopathic pulmonary fibrosis (IPF)*** - This is the **most common** form of idiopathic interstitial pneumonia, accounting for approximately **50-60% of all IIP cases** - Represents the **most severe** IIP subtype with poor prognosis - Characterized by progressive **usual interstitial pneumonia (UIP) pattern** with fibroblastic foci and honeycombing - Presents with progressive dyspnea, dry cough, and restrictive lung disease *Organizing pneumonia* - While **Cryptogenic Organizing Pneumonia (COP)** is a form of idiopathic interstitial pneumonia, it is **much less common than IPF** [1] - Characterized by **intra-alveolar granulation tissue (Masson bodies)** [1] - Better prognosis and steroid-responsive compared to IPF [1] *Sarcoidosis* - This is **NOT classified as an idiopathic interstitial pneumonia** - It is a separate **multisystem granulomatous disease** with **non-caseating granulomas** - Has a distinct etiology related to altered immune response - Does not belong to the IIP classification system *Lipoid pneumonia* - This is **NOT an idiopathic interstitial pneumonia** - Results from **aspiration of lipid substances** causing exogenous lipoid pneumonia - Has a **known extrinsic cause**, therefore not "idiopathic" - Not part of the IIP classification **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 330-331.
Question 8: A CT scan shows the 'crazy paving' pattern in both lungs. Which bronchoalveolar lavage finding would confirm pulmonary alveolar proteinosis?
- A. Milky fluid with PAS-positive material (Correct Answer)
- B. Hemosiderin-laden macrophages
- C. Eosinophilia >25%
- D. CD4/CD8 ratio >3.5
Explanation: ***Milky fluid with PAS-positive material*** - A **milky, turbid bronchoalveolar lavage (BAL) fluid** is characteristic of **pulmonary alveolar proteinosis (PAP)** due to the accumulation of lipoproteinaceous material [1]. - **Periodic Acid-Schiff (PAS) staining** confirms the presence of this **glycoprotein-rich surfactant material**, which reacts positively [1]. *Hemosiderin-laden macrophages* - These are indicative of **pulmonary hemorrhage**, not PAP. - They are commonly seen in conditions like **Goodpasture syndrome** or **idiopathic pulmonary hemosiderosis**. *Eosinophilia >25%* - Significant **eosinophilia in BAL fluid** is a hallmark of **eosinophilic pneumonia**, a different interstitial lung disease. - It suggests an **allergic or hypersensitivity reaction** in the lungs. *CD4/CD8 ratio >3.5* - An **elevated CD4/CD8 ratio** in BAL fluid is highly suggestive of **sarcoidosis**, a granulomatous inflammatory disease. - This ratio reflects the **lymphocyte population** in the alveoli, not lipoproteinaceous accumulation. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 703-705.
Question 9: Among the following conditions, laparoscopy carries the highest risk in patients with:
- A. COPD (Correct Answer)
- B. Diabetes
- C. Hypertension
- D. Obesity
Explanation: ***COPD*** - **COPD** patients have severely compromised respiratory function, and the **pneumoperitoneum** from CO2 insufflation causes **diaphragmatic splinting** and reduced lung compliance, leading to dangerous **CO2 retention** and respiratory failure. - The increased **intra-abdominal pressure** significantly impairs ventilation in patients who already have limited respiratory reserve, making laparoscopy extremely high-risk. *Diabetes* - While diabetes increases risks of **poor wound healing** and **infection**, these complications are not specifically worse with laparoscopy compared to open surgery. - **Perioperative glucose management** can effectively control diabetes-related risks, and laparoscopy may actually offer benefits like smaller incisions. *Hypertension* - **Hypertension** requires careful **blood pressure monitoring** during surgery but doesn't pose risks unique to laparoscopic procedures. - Well-controlled hypertension with appropriate **antihypertensive medications** allows for safe laparoscopic surgery. *Obesity* - **Obesity** makes laparoscopy technically challenging due to **thick abdominal walls** and need for higher insufflation pressures. - However, laparoscopy is often **preferred over open surgery** in obese patients due to reduced wound complications and faster recovery.
Question 10: X-ray chest in a neonate may show 'ground glass' haziness in all the following conditions EXCEPT:
- A. Left-to-right shunt (Correct Answer)
- B. Obstructed TAPVC
- C. Staphylococcal pneumonia
- D. Hyaline membrane disease
Explanation: ***Left-to-right shunt*** - A **left-to-right shunt** in a neonate typically causes an increase in pulmonary blood flow, leading to vascular congestion and possibly **cardiomegaly**, not ground-glass haziness. - While prolonged significant shunting can lead to pulmonary edema, classic "ground glass" haziness is more characteristic of diffuse lung pathology. *Obstructed TAPVC* - **Obstructed total anomalous pulmonary venous connection (TAPVC)** leads to severe pulmonary venous congestion, resulting in **pulmonary edema** and a classic **ground-glass appearance** on chest X-ray. - This condition is a surgical emergency due to severe respiratory distress and lung opacification. *Staphylococcal pneumonia* - **Staphylococcal pneumonia** in neonates can cause extensive **pulmonary inflammation** and **exudate formation**, leading to a diffuse alveolar filling pattern that appears as ground-glass opacities. - This is a severe form of pneumonia that can rapidly progress. *Hyaline membrane disease* - **Hyaline membrane disease (respiratory distress syndrome)** is characterized by surfactant deficiency, leading to diffuse **atelectasis** and **pulmonary edema**, which manifests as a **ground-glass appearance** on chest X-ray. - This condition commonly affects premature infants and is associated with air bronchograms.
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