Pulmonology Practice Questions

Q: A 80-year-old male presented with a lung abscess in the left upper zone. What is the best treatment modality?

Antibiotics according to identified organisms. **Explanation:** The primary management of a lung abscess is **medical therapy**. Unlike abscesses in other parts of the body that require immediate surgical drainage, lung abscesses usually communicate with the bronchial tree, allowing for natural drainage through expectoration. **1. Why Option A is Correct:** Systemic **antibiotics** are the cornerstone of treatment. Since lung abscesses are often polymicrobial (involving anaerobes and aerobes), empirical therapy is started and then tailored based on culture and sensitivity from sputum or bronchoalveolar lavage. Treatment is prolonged, often lasting 4–6 weeks, until the cavity disappears or only a small stable scar remains on imaging. **2. Why Incorrect Options are Wrong:** * **Surgical Drainage (Option B):** Surgery (lobectomy or pneumonectomy) is reserved for complications like massive hemoptysis, suspicion of malignancy, or failure of medical therapy (refractory cases). It is never the first-line treatment. * **Tube Thoracostomy (Option C):** This is the treatment for **empyema** (pus in the pleural space). Inserting a chest tube into a lung abscess is generally avoided as it can lead to a bronchopleural fistula. Percutaneous drainage is only considered if the patient is septic and not responding to antibiotics. * **Observation (Option D):** A lung abscess is a serious infection that can lead to sepsis or rupture; "wait and watch" is inappropriate. **Clinical Pearls for NEET-PG:** * **Most common cause:** Aspiration (often due to poor oral hygiene or altered consciousness). * **Most common site:** Posterior segment of the right upper lobe or superior segment of the right lower lobe (due to the anatomy of the right main bronchus). * **Indications for Surgery:** Large cavity (>6 cm), refractory to antibiotics, or life-threatening hemoptysis. * **Key sign on X-ray:** An air-fluid level within a thick-walled cavity.

Q: Which of the following statements about hemoptysis is false?

CT chest is the initial investigation performed.. The correct answer is **C**. While CT angiography is highly sensitive for identifying the site of bleeding, the **initial investigation** for any patient presenting with hemoptysis is a **Chest X-ray (CXR)**. CXR is quick, cost-effective, and can identify common causes like pneumonia, masses, or cavitation [1]. If the CXR is negative and clinical suspicion remains high, a CT scan follows. **Analysis of other options:** * **Option A:** Massive hemoptysis is traditionally defined as **>600 ml of blood in 24 hours** (or >100-150 ml/hr). However, the clinical definition often focuses on the threat to the airway and hemodynamic stability rather than exact volume. * **Option B:** The lungs have a dual blood supply. While the pulmonary arteries handle 99% of blood flow (low pressure), **90% of hemoptysis cases originate from the bronchial arteries**, which are under high systemic pressure [3]. * **Option D:** In hemodynamically unstable patients with massive bleeding, **rigid bronchoscopy** is the procedure of choice. It allows for better airway control, superior suctioning of large clots, and the ability to perform therapeutic interventions (e.g., balloon tamponade). **Clinical Pearls for NEET-PG:** * **Most common cause of hemoptysis (Worldwide):** Tuberculosis [1]. * **Most common cause (Developed countries):** Bronchitis/Bronchiectasis [2]. * **Management Priority:** Always secure the airway first. Position the patient with the **bleeding lung in the dependent (downward) position** to prevent aspiration into the healthy lung. * **Gold Standard for localization:** Multi-detector CT (MDCT) angiography. * **Definitive non-surgical treatment:** Bronchial Artery Embolization (BAE) [3].

Q: Proximal bronchiectasis, blood eosinophilia, and asthma are characteristic features of which condition?

Allergic bronchopulmonary aspergillosis. The correct answer is **Allergic Bronchopulmonary Aspergillosis (ABPA)**. ABPA is a complex hypersensitivity reaction (Type I and Type III) to *Aspergillus fumigatus* colonization in the airways, occurring almost exclusively in patients with **Asthma** or **Cystic Fibrosis** [1]. **Why ABPA is correct:** The diagnosis is based on a constellation of clinical and radiological findings. The presence of **asthma**, **peripheral blood eosinophilia**, and **proximal (central) bronchiectasis** are hallmark features [2]. In ABPA, the immune system reacts to fungal antigens, leading to mucus plugging in the central bronchi. This results in the characteristic "finger-in-glove" appearance on imaging and subsequent permanent dilation of the proximal airways [2]. **Why other options are incorrect:** * **Histoplasmosis:** A fungal infection caused by *Histoplasma capsulatum*, typically presenting as a granulomatous lung disease (similar to TB) or mediastinal lymphadenopathy, not typically associated with asthma or proximal bronchiectasis. * **Measles:** While measles can cause severe viral pneumonia or late-onset bronchiectasis (usually follicular), it does not present with eosinophilia or asthma. * **Tuberculosis:** TB is a common cause of **traction bronchiectasis** (usually in the upper lobes), but it is an infectious process characterized by granulomatous inflammation, not eosinophilic hypersensitivity [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** Look for "Finger-in-glove" opacities and "Tram-track" appearance. * **Laboratory:** Elevated **Total Serum IgE** (>1000 IU/mL) is a key screening criterion. * **Serology:** Specific IgE and IgG against *Aspergillus fumigatus* are elevated. * **Treatment:** The mainstay of treatment is **Oral Corticosteroids** to reduce inflammation, often combined with **Itraconazole** to reduce the fungal burden.

Q: Which interleukin is involved in asthma?

IL-5. ### Explanation **Correct Answer: A. IL-5** **Mechanism and Pathophysiology:** Asthma is primarily a **Type 2 helper T cell (Th2)-mediated** inflammatory disease. When an allergen is encountered, Th2 cells release a specific profile of cytokines, most notably **IL-4, IL-5, and IL-13**. [1] * **IL-5** is the key cytokine responsible for the **recruitment, activation, and survival of eosinophils**. * Eosinophilic inflammation is a hallmark of "Th2-high" asthma, leading to airway hyperresponsiveness and tissue damage. [1] This clinical significance is highlighted by the use of monoclonal antibodies like **Mepolizumab** and **Reslizumab**, which target IL-5 to treat severe eosinophilic asthma. **Analysis of Incorrect Options:** * **B. IL-1:** This is a pro-inflammatory cytokine primarily involved in the innate immune response and acute phase reactions (fever). While it plays a role in general inflammation, it is not the primary driver of the specific Th2 pathway in asthma. * **C. IL-2:** Known as the T-cell growth factor, IL-2 is essential for the proliferation of all T-cell subsets and is more closely associated with acute transplant rejection and general lymphocyte activation rather than the specific allergic cascade of asthma. * **D. INF-alpha:** Interferon-alpha is an antiviral cytokine used in the treatment of Hepatitis B/C and certain malignancies. In fact, Type 1 interferons (like INF-alpha) often antagonize Th2 responses; a deficiency in interferon production is sometimes linked to increased susceptibility to viral-induced asthma exacerbations. **High-Yield Clinical Pearls for NEET-PG:** * **IL-4:** Responsible for B-cell class switching to **IgE** production. [1] * **IL-13:** Stimulates **mucus hypersecretion** and bronchial hyperreactivity. * **Charcot-Leyden Crystals:** Formed from the breakdown of eosinophils (galectin-10) in asthmatic sputum. * **Curschmann Spirals:** Whorled mucus plugs seen in the sputum of asthma patients.

Q: Which of the following is the least common bacterium responsible for acute exacerbation of chronic bronchitis?

Staphylococcus aureus. **Explanation:** Acute Exacerbation of Chronic Obstructive Pulmonary Disease (AECOPD) or Chronic Bronchitis is frequently triggered by bacterial infections. The pathophysiology involves an increase in airway inflammation and mucus production, often driven by specific respiratory pathogens. **Why Staphylococcus aureus is the correct answer:** While *Staphylococcus aureus* can cause pneumonia, it is a **rare** cause of simple acute exacerbations of chronic bronchitis [1]. It is generally only considered in specific contexts, such as post-viral (influenza) infections or in patients with severe structural lung damage (like bronchiectasis) [1]. In standard epidemiological studies of AECOPD, it consistently ranks as the least common among the listed options. **Analysis of Incorrect Options:** * **Haemophilus influenzae (Option C):** This is the **most common** bacterial pathogen isolated in patients with AECOPD. It is a gram-negative coccobacillus that colonizes the lower airways of smokers. * **Streptococcus pneumoniae (Option A):** This is the second or third most common cause. It is a classic gram-positive diplococcus [1] and a major target for vaccination in COPD patients. * **Moraxella catarrhalis (Option B):** This is a very common cause, particularly in elderly patients and those with long-standing COPD. It is a gram-negative diplococcus. **NEET-PG High-Yield Pearls:** * **Most common cause of AECOPD overall:** Viral infections (e.g., Rhinovirus). * **Most common bacterial cause:** *Haemophilus influenzae*. * **Winnipeg Criteria:** Used to define the severity of an exacerbation based on increased dyspnea, increased sputum volume, and increased sputum purulence. * **Antibiotic Choice:** Usually targets the "Big Three" (*H. influenzae, S. pneumoniae, M. catarrhalis*) using Macrolides, Cephalosporins, or Amoxicillin-Clavulanate.

Q: Which of the following is true about Pneumothorax?

Decreased Chest Expansion. Pneumothorax occurs when air enters the pleural space, leading to the loss of negative intrapleural pressure and subsequent lung collapse [1]. **Why Option A is Correct:** In pneumothorax, the affected side of the chest is already in a state of relative expansion due to the presence of air in the pleural cavity. During inspiration, the collapsed lung cannot expand further, and the chest wall on that side shows **decreased or restricted movement/expansion** compared to the healthy side. **Why the other options are Incorrect:** * **B. Increased Breath Sounds:** In pneumothorax, the air in the pleural space acts as an insulator, preventing the transmission of sounds from the lung to the chest wall. Therefore, breath sounds are **absent or significantly diminished**. * **C. Increased Vocal Resonance:** Similar to breath sounds, the conduction of vibrations is interrupted by the air-filled pleural space. This leads to **decreased vocal resonance** and decreased vocal fremitus. (Increased resonance is seen in consolidation). * **D. Dull Percussion Note:** Air is less dense than lung tissue. Percussion over an air-filled pleural space yields a **hyper-resonant** note. A dull note is characteristic of fluid (pleural effusion) or solid mass (consolidation/collapse). **High-Yield Clinical Pearls for NEET-PG:** * **Tension Pneumothorax:** Look for hemodynamic instability, tracheal deviation to the *opposite* side, and distended neck veins [1]. It is a clinical diagnosis; do not wait for an X-ray [1]. * **Deep Sulcus Sign:** A classic radiological finding on a supine chest X-ray indicating pneumothorax. * **Management:** Small primary spontaneous pneumothorax (<2cm) may be managed conservatively; large or symptomatic cases require needle decompression (2nd ICS, mid-clavicular line) or chest tube insertion (5th ICS, anterior axillary line).

Question 1

A 80-year-old male presented with a lung abscess in the left upper zone. What is the best treatment modality?

Accepted Answer

Antibiotics according to identified organisms

Answer

Surgical drainage

Answer

Tube thoracostomy

Answer

Observation (wait and watch)

Question 2

A 28-year-old man presents with coughing up blood and sputum. He has a history of recurrent pneumonias and a chronic cough productive of foul-smelling purulent sputum. He has no other past medical history and is a lifetime nonsmoker. On physical examination, there are no oral lesions, heart sounds are normal, and wet inspiratory crackles are heard at the lung bases posteriorly. He also has clubbing of his fingers, but there is no hepatosplenomegaly or any palpable lymph nodes. Chest X-ray shows fibrosis and pulmonary infiltrates in the right lower lung. Which of the following is the most appropriate initial diagnostic test?

Accepted Answer

Chest CT scan

Answer

Bronchoscopy

Answer

Bronchography

Answer

Open thoracotomy

Question 3

Pulmonary tuberculosis is more common in patients with which of the following associated diseases?

Accepted Answer

Mitral stenosis

Answer

Acquired immune deficiency syndrome

Answer

Diabetes mellitus

Answer

Chronic renal failure

Question 4

Which of the following statements about hemoptysis is false?

Accepted Answer

CT chest is the initial investigation performed.

Answer

Massive hemoptysis is defined as bleeding greater than 600 ml in 24 hours.

Answer

In 90% of cases, hemoptysis originates from bronchial arteries.

Answer

In an unstable patient, rigid bronchoscopy is performed to identify the bleeding site.

Question 5

Proximal bronchiectasis, blood eosinophilia, and asthma are characteristic features of which condition?

Accepted Answer

Allergic bronchopulmonary aspergillosis

Answer

Histoplasmosis

Answer

Measles

Answer

Tuberculosis

Question 6

Which interleukin is involved in asthma?

Accepted Answer

IL-5

Answer

IL-1

Answer

IL-2

Answer

INF-alpha

Question 7

What is the definitive diagnostic method for bronchial asthma?

Accepted Answer

Demonstration of reversible bronchial hyperresponsiveness

Answer

Symptomatic relief following bronchodilator administration

Answer

Methacholine challenge test

Answer

A reduced FEV/FVC ratio on spirometry

Question 8

Which of the following is the least common bacterium responsible for acute exacerbation of chronic bronchitis?

Accepted Answer

Staphylococcus aureus

Answer

Streptococcus pneumoniae

Answer

Moraxella catarrhalis

Answer

Haemophilus influenza

Question 9

Which of the following conditions is associated with increased vocal resonance?

Accepted Answer

Bronchial carcinoma

Answer

Empyema

Answer

Primary TB lung

Answer

Fibrosing alveolitis

Question 10

Which of the following is true about Pneumothorax?

Accepted Answer

Decreased Chest Expansion

Answer

Increased Breath Sounds

Answer

Increased Vocal Resonance

Answer

Dull percussion note

Pulmonology — MCQs

Pulmonology — MCQs

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