Pulmonology Practice Questions

Q: Lingular lobe bronchiectasis is most commonly due to which of the following conditions?

Mycobacterium Avium intracellulare infection. The correct answer is **Mycobacterium Avium intracellulare (MAC) infection**. **Why it is correct:** MAC infection is the hallmark cause of **Lady Windermere Syndrome**. This clinical phenotype typically affects elderly, non-smoking women who chronically suppress the cough reflex. The voluntary suppression of cough leads to the stagnation of secretions in the **lingula** (left lung) and the **middle lobe** (right lung). Because these lobes have long, narrow bronchi with a relatively poor gravitational drainage, they are highly susceptible to chronic infection, leading to localized bronchiectasis in these specific segments [1]. **Why other options are incorrect:** * **Cystic Fibrosis:** Typically causes widespread, bilateral bronchiectasis that is most severe in the **upper lobes** due to higher oxygen tension and impaired clearance. * **Tuberculosis:** Post-tubercular bronchiectasis is a common sequela in India, but it characteristically involves the **apical and posterior segments of the upper lobes**, following the primary site of reactivation. * **Aspergillosis (ABPA):** Allergic Bronchopulmonary Aspergillosis classically presents with **central (proximal) bronchiectasis**, often involving the upper and middle lobes, but it is not specifically localized to the lingula. **High-Yield Clinical Pearls for NEET-PG:** * **Lady Windermere Syndrome:** Look for a triad of elderly female, chronic cough suppression, and MAC infection in the lingula/middle lobe. * **Kartagener Syndrome:** Associated with situs inversus and lower lobe bronchiectasis. * **Williams-Campbell Syndrome:** Bronchiectasis due to congenital deficiency of bronchial cartilage. * **HRCT Chest:** The gold standard investigation for diagnosing bronchiectasis (look for the "Signet ring sign") [1].

Q: What are the risk factors for pulmonary embolism?

All of the above. The core concept underlying the risk factors for Pulmonary Embolism (PE) is **Virchow’s Triad**, which consists of three factors that lead to thrombus formation: **Endothelial injury, Stasis of blood flow, and Hypercoagulability.** [1] **Explanation of Options:** * **A. Oral Contraceptive Pills (OCPs):** Estrogen-containing OCPs increase the synthesis of clotting factors (fibrinogen, VII, X) and decrease natural anticoagulants like Protein S. This creates a **hypercoagulable state**, significantly increasing the risk of Venous Thromboembolism (VTE). [1] * **B. Pregnancy:** Pregnancy induces a physiological hypercoagulable state to prevent hemorrhage during delivery. Additionally, the gravid uterus can compress the inferior vena cava, leading to **venous stasis** in the lower limbs. [1] * **C. Leg Paralysis:** Immobilization due to paralysis (e.g., spinal cord injury or stroke) leads to the loss of the "calf muscle pump" action. This results in significant **venous stasis**, allowing thrombi to form in the deep veins of the legs, which can then embolize to the lungs. [1] Since all three scenarios fulfill components of Virchow’s Triad, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Most common source of PE:** Deep veins of the lower proximal limbs (Iliofemoral veins). * **Strongest risk factor:** Previous history of VTE. * **Genetic risk factors:** Factor V Leiden mutation (most common inherited cause) and Prothrombin G20210A mutation. [1] * **Trousseau’s Syndrome:** Migratory thrombophlebitis associated with visceral malignancies (especially pancreatic cancer). [1] * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA). [2]

Q: Which one of the following is not a feature of type 2 respiratory failure?

pCO2 38 mm Hg and pO2 50 mm Hg. ### Explanation Respiratory failure is clinically defined based on arterial blood gas (ABG) parameters. The fundamental distinction between Type 1 and Type 2 lies in the level of carbon dioxide ($pCO_2$) [1]. **1. Why Option A is the Correct Answer:** Option A describes **Type 1 (Hypoxemic) Respiratory Failure**. * **Criteria:** $pO_2 50$ mmHg** [2]. * **Option B ($pCO_2$ 68, $pO_2$ 50):** This is a classic ABG profile for Type 2 failure, showing both hypoxemia and significant hypercapnia [2]. * **Option C (Papilloedema):** Severe hypercapnia causes cerebral vasodilation, increasing intracranial pressure, which can manifest as papilloedema. * **Option D (Asterixis):** Also known as "flapping tremors," this is a classic physical sign of CO2 narcosis/encephalopathy seen in Type 2 failure [3]. **Clinical Pearls for NEET-PG:** * **Type 1 (Hypoxemic):** Caused by V/Q mismatch or shunting (e.g., Pneumonia, Pulmonary Edema, ARDS) [1]. * **Type 2 (Hypercapnic):** Caused by reduced minute ventilation (e.g., COPD, Myasthenia Gravis, Obesity Hypoventilation Syndrome, Opioid overdose) [3]. * **The "Flap":** Asterixis is not specific to liver failure; in pulmonology, it signifies severe CO2 retention. * **Acidosis:** Type 2 failure is usually associated with respiratory acidosis ($pH < 7.35$) unless compensated chronically [3].

Q: A patient presents with decreased vital capacity and total lung volume. What is the most probable diagnosis?

Sarcoidosis. **Explanation:** The clinical presentation of decreased **Vital Capacity (VC)** and **Total Lung Capacity (TLC)** is the hallmark of a **Restrictive Lung Disease** pattern [1]. In restriction, lung expansion is limited, leading to a reduction in all lung volumes [1]. **1. Why Sarcoidosis is Correct:** Sarcoidosis is an interstitial lung disease (ILD) characterized by non-caseating granulomas [3]. These granulomas and subsequent fibrosis increase lung stiffness (decreased compliance), making it difficult for the lungs to expand. This results in a classic restrictive pattern on Pulmonary Function Tests (PFTs): reduced TLC, reduced VC, and a normal or increased FEV1/FVC ratio [1]. **2. Why the other options are incorrect:** * **Asthma:** This is an **obstructive** lung disease. It is characterized by a decrease in the FEV1/FVC ratio (less than 70%) [2]. While VC may decrease during an acute attack due to air trapping, the TLC is typically normal or increased (hyperinflation). * **Bronchiectasis:** This is a chronic **obstructive** airway disease involving permanent dilation of bronchi. PFTs show airflow obstruction and increased residual volume (RV). * **Cystic Fibrosis:** Primarily manifests as an **obstructive** lung disease due to thick mucus plugging and bronchiectasis, leading to hyperinflation (increased TLC) rather than restriction. **NEET-PG High-Yield Pearls:** * **Restrictive Pattern:** ↓ TLC, ↓ VC, ↓ FRC, but **Normal/↑ FEV1/FVC ratio** [1]. * **Obstructive Pattern:** ↓ FEV1, ↓ FEV1/FVC ratio (<0.7), and **↑ TLC/RV** (due to air trapping) [2]. * **Sarcoidosis PFTs:** Usually restrictive, but can show an obstructive pattern if there is endobronchial involvement. * **DLCO in Sarcoidosis:** Typically decreased due to alveolar-capillary membrane thickening.

Q: A 65-year-old man presented with hemoptysis and stage 3 clubbing. What is the probable diagnosis?

Non-small cell lung cancer. ### Explanation The combination of **hemoptysis** and **Stage 3 clubbing** in an elderly patient is a classic presentation for **Bronchogenic Carcinoma**, specifically **Non-Small Cell Lung Cancer (NSCLC)** [1]. **1. Why Non-Small Cell Lung Cancer (NSCLC) is correct:** Clubbing (Hypertrophic Pulmonary Osteoarthropathy) is a common paraneoplastic manifestation of lung malignancies [1]. Crucially, it is **frequently associated with NSCLC** (especially Adenocarcinoma and Squamous cell carcinoma). Hemoptysis in an elderly smoker is a "red flag" symptom that strongly points toward a primary endobronchial malignancy [1]. **2. Why the other options are incorrect:** * **Small Cell Lung Cancer (SCLC):** While SCLC causes hemoptysis and various paraneoplastic syndromes (like SIADH or Cushing’s), it is **rarely associated with clubbing** [1]. * **Tuberculosis (TB):** TB is a leading cause of hemoptysis; however, it typically presents with constitutional symptoms [2]. While chronic TB can cause clubbing, the association is much stronger with malignancy in this age group [2]. * **Sarcoidosis:** This typically presents with bilateral hilar lymphadenopathy and dry cough. Clubbing is **extremely rare** in sarcoidosis and only occurs in advanced Stage IV (fibrotic) disease. **Clinical Pearls for NEET-PG:** * **Stages of Clubbing:** Stage 3 is characterized by increased curvature of the nail in all dimensions (**"Parrot Beak"** appearance) and obliterated Schamroth’s window. * **Hypertrophic Osteoarthropathy (HOA):** When clubbing is associated with periostitis of long bones and joint swelling, it is most commonly due to **Adenocarcinoma** of the lung [1]. * **SCLC vs. NSCLC:** Remember, **"S"**mall cell is associated with **"S"**IADH and **"S"**yndrome of ectopic ACTH, but **NOT** usually with clubbing [1].

Q: Serum ACE levels are reduced in which of the following conditions?

COPD. Angiotensin-Converting Enzyme (ACE) is primarily produced by the **vascular endothelial cells**, with the highest concentration found in the pulmonary capillaries. **Why COPD is the correct answer:** In **COPD**, chronic inflammation and alveolar destruction (emphysema) lead to a significant reduction in the total surface area of the pulmonary capillary bed [1]. Since the pulmonary endothelium is the primary site of ACE production, its destruction results in **decreased serum ACE levels**. Other conditions associated with low ACE include starvation, hypothyroidism, and the use of ACE inhibitors. **Analysis of Incorrect Options:** * **Sarcoidosis (Option A):** This is the most classic condition where ACE levels are **elevated**. ACE is produced by the epithelioid cells and activated macrophages within the non-caseating granulomas. It is used as a marker of total granuloma burden and to monitor treatment response. * **Diabetes Mellitus (Option C):** Serum ACE levels are typically **elevated** in patients with DM, particularly those with diabetic retinopathy, likely due to generalized endothelial dysfunction and microvascular damage. * **Histoplasmosis (Option D):** Similar to other granulomatous diseases (like Tuberculosis or Silicosis), Histoplasmosis often causes an **increase** in serum ACE levels due to macrophage activation within granulomas. **High-Yield Clinical Pearls for NEET-PG:** * **ACE as a Marker:** While elevated in 75% of active Sarcoidosis cases, it is **not** diagnostic due to low specificity. * **Other causes of High ACE:** Hyperthyroidism, Gaucher’s disease, Leprosy, and Alcoholic Liver Disease. * **Key Site:** Remember that the **Lung** is the primary organ for the conversion of Angiotensin I to Angiotensin II due to the vast surface area of its capillary endothelium.

Q: Which of the following is not a feature of idiopathic pulmonary hemosiderosis?

Eosinopenia. **Explanation:** **Idiopathic Pulmonary Hemosiderosis (IPH)** is a rare condition characterized by recurrent episodes of diffuse alveolar hemorrhage (DAH) primarily in children and young adults. It is a diagnosis of exclusion, defined by the classic triad of hemoptysis, iron deficiency anemia, and pulmonary infiltrates. **Why Eosinopenia is the Correct Answer:** Eosinopenia (a decrease in eosinophils) is **not** a feature of IPH. In fact, approximately **10–20% of patients with IPH exhibit peripheral eosinophilia**. While the exact etiology of IPH is unknown, the presence of eosinophilia in some cases suggests an underlying immune-mediated or allergic mechanism (similar to Heiner Syndrome, which is IPH associated with cow's milk hypersensitivity). **Analysis of Incorrect Options:** * **Hemoptysis (Option A):** This is the most common presenting symptom. It results from the rupture of alveolar capillaries leading to bleeding into the alveolar spaces. * **Iron Deficiency Anemia (Option C):** Recurrent alveolar bleeding leads to the sequestration of iron within pulmonary macrophages (as hemosiderin). Since this iron cannot be recycled by the body for erythropoiesis, patients develop microcytic hypochromic anemia despite having high pulmonary iron stores. * **Diffuse Alveolar Hemorrhage (Option D):** This is the hallmark pathological process of IPH. On imaging, it presents as transient patchy or diffuse ground-glass opacities. **NEET-PG High-Yield Pearls:** * **Diagnosis:** Confirmed by finding **hemosiderin-laden macrophages** ("siderophages") in bronchoalveolar lavage (BAL) or gastric aspirates. * **Biopsy:** Shows intra-alveolar hemorrhage and hemosiderin without evidence of vasculitis or immune complex deposition (unlike Goodpasture syndrome). * **Treatment:** Systemic corticosteroids are the mainstay for acute episodes; immunosuppressants (e.g., Azathioprine) may be used for maintenance.

Question 1

Lingular lobe bronchiectasis is most commonly due to which of the following conditions?

Accepted Answer

Mycobacterium Avium intracellulare infection

Answer

Cystic Fibrosis

Answer

Tuberculosis

Answer

Aspergillosis

Question 2

What are the risk factors for pulmonary embolism?

Accepted Answer

All of the above

Answer

A 30-year-old female on oral contraceptive pills

Answer

Pregnancy

Answer

Leg paralysis

Question 3

Which one of the following is not a feature of type 2 respiratory failure?

Accepted Answer

pCO2 38 mm Hg and pO2 50 mm Hg

Answer

pCO2 68 mm Hg and pO2 50 mm Hg

Answer

Papilloedema

Answer

Asterixis

Question 4

A patient presents with decreased vital capacity and total lung volume. What is the most probable diagnosis?

Accepted Answer

Sarcoidosis

Answer

Bronchiectasis

Answer

Cystic fibrosis

Answer

Asthma

Question 5

Which of the following statements is FALSE regarding flexible bronchoscopy?

Accepted Answer

Removal of foreign bodies is easier than with rigid bronchoscopy.

Answer

It does not require general anesthesia.

Answer

It can be performed at the bedside.

Answer

It allows for better visualization of the distal airway.

Question 6

A 65-year-old man presented with hemoptysis and stage 3 clubbing. What is the probable diagnosis?

Accepted Answer

Non-small cell lung cancer

Answer

Small cell lung cancer

Answer

Tuberculosis

Answer

Sarcoidosis

Question 7

Which of the following is NOT a consequence of obstructive sleep apnea?

Accepted Answer

Parasympathetic hyperstimulation

Answer

Pulmonary vasoconstriction

Answer

Systemic hypertension

Answer

Polycythemia

Question 8

Serum ACE levels are reduced in which of the following conditions?

Accepted Answer

COPD

Answer

Sarcoidosis

Answer

DM

Answer

Histoplasmosis

Question 9

Which one of the following parameters is consistent with pleural transudate?

Accepted Answer

LDH < 2/3 of the upper limit of serum LDH

Answer

WBC count > 1500/mm³

Answer

Specific gravity > 1.020

Answer

Protein level > 2.5 g/dL

Question 10

Which of the following is not a feature of idiopathic pulmonary hemosiderosis?

Accepted Answer

Eosinopenia

Answer

Hemoptysis

Answer

Iron deficiency anemia

Answer

Diffuse alveolar hemorrhage

Pulmonology — MCQs

Pulmonology — MCQs

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