Pulmonology Practice Questions

Q: There is no correlation between X-ray appearance and clinical state of the patient with pneumonia in which of the following etiologies?

Mycoplasma. ### Explanation The correct answer is **Mycoplasma pneumoniae**. **1. Why Mycoplasma is correct:** *Mycoplasma pneumoniae* is the classic cause of **Atypical Pneumonia**. The hallmark of this condition is the **clinico-radiological dissociation**: the patient often appears relatively well clinically (presenting with a persistent dry cough, low-grade fever, and headache—often called "Walking Pneumonia"), but the chest X-ray reveals extensive, patchy interstitial infiltrates or reticulonodular patterns. The severity of the radiological findings far exceeds the mild physical signs and symptoms. **2. Why other options are incorrect:** * **Friedlander’s Bacillus (*Klebsiella pneumoniae*):** Typically causes severe, lobar pneumonia with a "bulging fissure sign" due to heavy inflammatory exudate [1]. The clinical severity (high fever, prostration, currant-jelly sputum) correlates well with the dense consolidation seen on X-ray. * **Pneumococcal (*Streptococcus pneumoniae*):** The most common cause of community-acquired pneumonia [1]. It presents with classic lobar consolidation. The clinical state (shaking chills, pleuritic chest pain) usually matches the radiological extent. * **Staphylococcal (*Staphylococcus aureus*):** This is a necrotizing pneumonia [2]. X-rays show rapid progression, abscesses, and **pneumatoceles** (especially in children). The patient is typically toxic and hemodynamically unstable, correlating with the aggressive X-ray findings. **3. Clinical Pearls for NEET-PG:** * **Cold Agglutinins:** Elevated in 50% of Mycoplasma cases (IgM antibodies against I-antigen on RBCs). * **Extrapulmonary Manifestations:** Mycoplasma is associated with **Erythema Multiforme**, Stevens-Johnson Syndrome, and Bullous Myringitis. * **Treatment of Choice:** Macrolides (Azithromycin) or Tetracyclines (Doxycycline), as Mycoplasma lacks a cell wall and is resistant to Beta-lactams.

Q: What is the initial treatment for pulmonary embolism?

Anticoagulation. **Explanation:** The primary goal in managing Pulmonary Embolism (PE) is to prevent further clot propagation and recurrent embolism while the body’s endogenous fibrinolytic system dissolves the existing clot. **1. Why Anticoagulation is Correct:** Anticoagulation is the **initial treatment of choice** for hemodynamically stable patients [2]. It should be started immediately upon clinical suspicion, even before confirmatory imaging (unless contraindicated). Common agents include Low Molecular Weight Heparin (LMWH), Fondaparinux, or Unfractionated Heparin (UFH) [2]. It halts the coagulation cascade, allowing the thrombus to stabilize and eventually resolve. **2. Why Other Options are Incorrect:** * **Fibrinolysis (Thrombolysis):** Reserved for **Massive PE** (hemodynamically unstable patients with systolic BP <90 mmHg) or select cases of Submassive PE with evidence of right ventricular strain [1]. It carries a high risk of major bleeding. * **Surgical Embolectomy:** A rescue therapy used only when fibrinolysis is contraindicated or has failed in critically ill patients [1]. * **Venacaval (IVC) Filter:** Indicated only when there is an **absolute contraindication to anticoagulation** or if there is recurrent PE despite adequate therapeutic anticoagulation. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA) [1]. * **Best Initial Test:** Chest X-ray (usually normal, but helps rule out other causes). * **ECG Finding:** Most common is Sinus Tachycardia; most specific is **S1Q3T3** (deep S in lead I, Q wave and inverted T in lead III). * **Drug of Choice in Pregnancy:** LMWH (does not cross the placenta). * **Wells’ Score:** Used to determine the pre-test probability of PE [2].

Q: A patient presents with hemoptysis, copious sputum, and 'tram lines' on the chest X-ray. What is the most likely diagnosis?

Bronchiectasis. ### Explanation **Correct Answer: C. Bronchiectasis** **Why it is correct:** Bronchiectasis is characterized by the permanent, abnormal dilation of the bronchi due to chronic inflammation and infection. The classic clinical triad includes **chronic cough**, **copious purulent sputum** (often foul-smelling), and **hemoptysis** (due to hypertrophied bronchial arteries) [1]. On a Chest X-ray, the thickened, dilated bronchial walls that fail to taper toward the periphery appear as parallel linear opacities known as **'Tram-track' or 'Tram-line' shadows** [2]. This is a hallmark radiological sign of cylindrical bronchiectasis. **Why the other options are incorrect:** * **A. Lung abscess:** Typically presents with high-grade fever and a single large cavity with an **air-fluid level** on X-ray, rather than diffuse tram lines [1]. * **B. Pulmonary embolism:** Presents with sudden onset dyspnea and pleuritic chest pain. X-ray is often normal or shows **Hampton’s hump** (wedge-shaped opacity) or **Westermark sign** (focal oligemia) [1]. * **D. Carcinoma of the lung:** Usually presents with weight loss and a focal mass lesion or post-obstructive pneumonia on X-ray, not diffuse bronchial wall thickening [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** High-Resolution CT (HRCT) scan. * **HRCT Sign:** **'Signet ring sign'** (the internal diameter of the bronchus is larger than its accompanying pulmonary artery). * **Most Common Cause (Global):** Post-infectious (e.g., Tuberculosis, Measles, Pertussis). * **Most Common Cause (Cystic Fibrosis):** *Pseudomonas aeruginosa* infection [2]. * **Kartagener Syndrome:** Triad of Bronchiectasis, Sinusitis, and Situs Inversus [3].

Q: All of the following are causes of hemorrhagic pleural effusion except?

Rheumatoid arthritis. **Explanation:** A **hemorrhagic pleural effusion** is defined by a pleural fluid appearance that is blood-tinged, typically with a Red Blood Cell (RBC) count >10,000/mm³. It is distinct from a hemothorax (where the pleural fluid hematocrit is >50% of the peripheral hematocrit). **Why Rheumatoid Arthritis (RA) is the correct answer:** Pleural effusion in RA is typically a **pseudochylothorax** or a chronic exudate [2]. Characteristically, RA effusions have **very low glucose levels** (<30 mg/dL), low pH, and high LDH [1]. The fluid is usually turbid or milky due to high cholesterol levels, but it is **not** typically hemorrhagic. **Analysis of incorrect options (Causes of Hemorrhagic Effusion):** * **Pulmonary Embolism (PE):** This is a common cause of hemorrhagic effusion due to pleural ischemia and increased capillary permeability following pulmonary infarction [1], [3]. * **Tuberculosis (TB):** While TB usually presents as a straw-colored exudate, it can be hemorrhagic in acute or severe cases due to the rupture of subpleural caseous foci. * **Pancreatitis:** Acute pancreatitis can cause a left-sided hemorrhagic effusion with high amylase levels due to the tracking of pancreatic enzymes through the diaphragm. **NEET-PG High-Yield Pearls:** 1. **Most common cause of hemorrhagic effusion:** Malignancy (especially Lung and Breast cancer) [1]. 2. **Differential for Low Glucose in Pleural Fluid:** RA (lowest), Empyema, Malignancy, and TB. 3. **Pancreatitis Effusion:** Characterized by very high **Amylase** levels (higher than serum levels). 4. **RA Effusion marker:** Low Complement levels (C3, C4) in the pleural fluid are often seen.

Q: A patient on spirometry shows FEV1/FVC =30% but <50% predicted. What is the patient's diagnosis according to GOLD criteria?

Severe COPD. ### Explanation The classification of Chronic Obstructive Pulmonary Disease (COPD) severity is based on the **GOLD (Global Initiative for Chronic Obstructive Lung Disease) criteria**. To diagnose COPD, the post-bronchodilator **FEV1/FVC ratio must be < 0.70** [1]. Once this obstruction is confirmed, the severity is graded based on the **FEV1 % predicted** value [1]. **Why "Severe COPD" is correct:** According to the GOLD staging [1]: * **GOLD 1 (Mild):** FEV1 ≥ 80% predicted * **GOLD 2 (Moderate):** 50% ≤ FEV1 < 80% predicted * **GOLD 3 (Severe):** 30% ≤ FEV1 < 50% predicted * **GOLD 4 (Very Severe):** FEV1 < 30% predicted Since the patient’s FEV1 is between 30% and 50%, they fall squarely into the **GOLD 3: Severe COPD** category. **Analysis of Incorrect Options:** * **Mild COPD:** Requires FEV1 ≥ 80%. * **Moderate COPD:** Requires FEV1 between 50% and 79%. * **Very Severe COPD:** Requires FEV1 to drop below 30% (or < 50% with chronic respiratory failure). **High-Yield Clinical Pearls for NEET-PG:** 1. **Diagnosis:** A post-bronchodilator FEV1/FVC < 0.7 is the **gold standard** for diagnosing persistent airflow limitation [1]. 2. **ABCD Assessment:** While GOLD grades (1-4) measure airflow limitation, the **ABCD (or ABE) assessment** tool is used to guide treatment based on symptoms (mMRC/CAT scores) and exacerbation history. 3. **Management:** Long-acting bronchodilators (LAMA/LABA) are the mainstay of treatment [1]. Inhaled Corticosteroids (ICS) are typically reserved for patients with high blood eosinophil counts or frequent exacerbations. 4. **Mortality:** The only interventions proven to prolong survival in COPD are **smoking cessation** and **long-term oxygen therapy (LTOT)** in hypoxic patients [1].

Question 1

Which of the following conditions can present with an obstructive pattern on pulmonary function tests in an Interstitial Lung Disease (ILD)?

Accepted Answer

Pulmonary lymphangioleiomyomatosis

Answer

Idiopathic pulmonary fibrosis

Answer

Non-specific interstitial pneumonitis

Answer

Cryptogenic organizing pneumonia

Question 2

What is the most common abnormality associated with ARDS?

Accepted Answer

Hypoxemia

Answer

Hypercapnea

Answer

Diffuse alveolar damage

Answer

Bilateral alveolar infiltrates

Question 3

There is no correlation between X-ray appearance and clinical state of the patient with pneumonia in which of the following etiologies?

Accepted Answer

Mycoplasma

Answer

Friedlander's bacillus

Answer

Pneumococcal

Answer

Staphylococcal

Question 4

What is the initial treatment for pulmonary embolism?

Accepted Answer

Anticoagulation

Answer

Fibrinolysis

Answer

Surgical embolectomy

Answer

Venacaval filter

Question 5

Which of the following conditions is characterized by miliary shadows on a chest X-ray?

Accepted Answer

Klebsiella pneumoniae

Answer

Tuberculosis

Answer

Sarcoidosis

Answer

Metastatic disease

Question 6

A patient presents with hemoptysis, copious sputum, and 'tram lines' on the chest X-ray. What is the most likely diagnosis?

Accepted Answer

Bronchiectasis

Answer

Lung abscess

Answer

Pulmonary embolism with infarction

Answer

Carcinoma of the lung

Question 7

All of the following are causes of hemorrhagic pleural effusion except?

Accepted Answer

Rheumatoid arthritis

Answer

Pulmonary embolism

Answer

Pancreatitis

Answer

Tuberculosis

Question 8

Which of the following statements about emphysema are true?

Accepted Answer

Breathlessness is always present, diffusion rate for carbon monoxide is reduced, and restrictive pattern of lung disease is absent.

Answer

Breathlessness is always present, diffusion rate for carbon monoxide is reduced, and long-term bronchodilator therapy is not effective.

Answer

Breathlessness is always present, diffusion rate for carbon monoxide is reduced, and restrictive pattern of lung disease is present.

Answer

Breathlessness is always present and diffusion rate for carbon monoxide is reduced.

Question 9

A patient on spirometry shows FEV1/FVC <0.7 and FEV1 >=30% but <50% predicted. What is the patient's diagnosis according to GOLD criteria?

Accepted Answer

Severe COPD

Answer

Mild COPD

Answer

Moderate COPD

Answer

Very severe COPD

Question 10

What is the most important pathogen causing pneumonia in a patient with bronchiectasis?

Accepted Answer

Staphylococcus aureus

Answer

Streptococcus pneumoniae

Answer

Oral anaerobes

Answer

Acinetobacter spp

Pulmonology — MCQs

Pulmonology — MCQs

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