Pulmonology Practice Questions

Q: A high amylase level in pleural fluid suggests which diagnosis?

Malignancy. Pleural fluid amylase is considered elevated when it exceeds the upper limit of normal for serum amylase or when the pleural fluid-to-serum amylase ratio is >1.0. **Why Malignancy is Correct:** Malignancy is one of the most common causes of amylase-rich pleural effusions. It is typically associated with **Adenocarcinoma** of the lung or ovary. In these cases, the amylase is usually of the **salivary isoenzyme** type, produced directly by the tumor cells themselves. [1] **Analysis of Incorrect Options:** * **Tuberculosis (A):** TB effusions are characterized by high protein (exudate), high ADA (Adenosine Deaminase) levels, and a lymphocytic predominance, but not typically high amylase. * **Rheumatoid Arthritis (C):** RA effusions are classic for having **very low glucose** levels (<30 mg/dL), high LDH, and low pH, but amylase levels remain normal. [1] * **Pulmonary Infarction (D):** This usually results in a bloody or serosanguinous exudative effusion with high mesothelial cells, but it does not involve amylase elevation. [1] **NEET-PG High-Yield Pearls:** The differential diagnosis for high amylase in pleural fluid is narrow and high-yield: 1. **Acute Pancreatitis:** (Most common cause; involves **pancreatic isoenzyme**; usually left-sided). [2] 2. **Esophageal Rupture (Boerhaave Syndrome):** (Highest levels of amylase; **salivary isoenzyme** due to swallowed saliva leaking into the mediastinum/pleura). [1] 3. **Malignancy:** (Salivary isoenzyme; primarily lung adenocarcinoma). 4. **Chronic Pancreatic Pseudocyst:** (Can cause massive pleural effusions). *Mnemonic: Remember "PEM" for high amylase — Pancreatitis, Esophageal rupture, Malignancy.*

Q: The complication least likely to occur in a case of chronic bronchitis is:

Spontaneous pneumothorax. **Explanation:** Chronic bronchitis is characterized by chronic airway inflammation, mucus hypersecretion, and airway narrowing. To identify the "least likely" complication, we must distinguish its pathophysiology from that of emphysema. **Why Spontaneous Pneumothorax is the correct answer:** Spontaneous pneumothorax is a classic complication of **emphysema**, not chronic bronchitis [1]. In emphysema, the destruction of alveolar walls leads to the formation of subpleural blebs or bullae. When these rupture, air enters the pleural space. While chronic bronchitis and emphysema often coexist in COPD, the specific pathological hallmark of chronic bronchitis (mucus gland hyperplasia) does not inherently cause bleb formation or lung collapse. **Analysis of Incorrect Options:** * **Pulmonary Hypertension:** Chronic bronchitis leads to chronic alveolar hypoxia. This triggers **hypoxic pulmonary vasoconstriction**, which increases pulmonary vascular resistance, eventually leading to pulmonary hypertension and Cor Pulmonale. * **Respiratory Acidosis:** Narrowed airways and mucus plugging lead to ventilation-perfusion (V/Q) mismatch and CO2 retention (hypercapnia) [1]. Chronic CO2 retention results in respiratory acidosis. * **Polycythemia:** Persistent hypoxemia stimulates the kidneys to release erythropoietin, which increases red blood cell production (secondary polycythemia) to improve oxygen-carrying capacity [1]. This is why chronic bronchitis patients are often termed "Blue Bloaters." **NEET-PG High-Yield Pearls:** * **Blue Bloaters (Chronic Bronchitis):** Characterized by hypoxia, hypercapnia, early onset of Cor Pulmonale, and polycythemia [1]. * **Pink Puffers (Emphysema):** Characterized by near-normal oxygenation (initially), hyperventilation, and a high risk of **pneumothorax** due to bullae. * **Reid Index:** Increased (>0.4) in chronic bronchitis (ratio of mucous gland thickness to bronchial wall thickness).

Q: The CURB-65 score is used in pneumonia to assess which of the following?

Severity. **Explanation:** The **CURB-65 score** is a validated clinical prediction rule used to determine the **severity** of Community-Acquired Pneumonia (CAP) [1]. Its primary purpose is to guide clinical decision-making regarding the site of care (outpatient vs. inpatient vs. ICU). **Why Severity is Correct:** The score assesses the physiological impact of pneumonia on the patient. By calculating a score from 0 to 5, clinicians can stratify patients into low, moderate, or high-risk categories [1]. A higher score indicates greater physiological derangement and a higher risk of mortality, directly reflecting the severity of the disease. **Why Other Options are Incorrect:** * **Complication:** While a high CURB-65 score may correlate with complications (like empyema or sepsis), the score itself does not identify or diagnose specific complications. * **Etiology:** The score is independent of the causative pathogen (e.g., *S. pneumoniae* vs. *Legionella*). It measures the host's response, not the microbial cause. * **Prognosis:** While CURB-65 is a strong predictor of 30-day mortality (prognostic value), its primary clinical application in guidelines (like BTS/IDSA) is to assess **severity** to decide on immediate management and hospitalization. **High-Yield Clinical Pearls for NEET-PG:** * **Components of CURB-65:** [1] 1. **C**onfusion (new onset) 2. **U**rea > 7 mmol/L (19 mg/dL) 3. **R**espiratory Rate ≥ 30/min 4. **B**lood Pressure (Systolic < 90 or Diastolic ≤ 60 mmHg) 5. **65** (Age ≥ 65 years) * **Management Guide:** [1] * Score **0-1**: Low risk; consider outpatient treatment. * Score **2**: Moderate risk; consider short-stay inpatient or supervised outpatient. * Score **3-5**: Severe pneumonia; urgent hospitalization (consider ICU for 4-5). * **CRB-65:** A modified version used in primary care when urea levels are unavailable.

Q: Which of the following is true about asthma?

Increase in IgE in idiosyncratic asthma. ### Explanation Asthma is a chronic inflammatory airway disease characterized by reversible airflow obstruction and bronchial hyperresponsiveness. **Why Option C is Correct:** Asthma is broadly classified into **Extrinsic (Atopic)** and **Intrinsic (Idiosyncratic/Non-atopic)** types. While extrinsic asthma is driven by Type I hypersensitivity to external allergens, **idiosyncratic asthma** typically occurs in older patients with no family history or positive skin tests. However, research indicates that even in idiosyncratic asthma, there is often a local or systemic **increase in IgE levels** and eosinophilic inflammation, suggesting a similar underlying mucosal inflammatory pathway despite the absence of identifiable external triggers. **Analysis of Incorrect Options:** * **Option A:** While asthma prevalence is high, the statement "increasing day by day" is a generalized epidemiological trend rather than a defining pathophysiological or clinical "truth" tested in this context. * **Option B:** Allergic (atopic) asthma is most common in **children and young adults**. In contrast, late-onset asthma is more frequently non-allergic (idiosyncratic). * **Option D:** While bronchoconstriction is a feature of an asthma attack, it is a **physiological manifestation** rather than a defining "true statement" in the context of the disease's classification or immunopathology compared to the specific immunological finding in Option C. **High-Yield NEET-PG Pearls:** * **Samter’s Triad:** Aspirin sensitivity, Nasal polyps, and Asthma (often seen in intrinsic cases). * **Diagnosis:** Gold standard is Spirometry showing reversibility (FEV1 increase >12% and >200ml after bronchodilator). * **Charcot-Leyden Crystals:** Formed from eosinophil lysophospholipase; found in the sputum of asthmatics. * **Curschmann Spirals:** Whorled mucus plugs found in subepithelial mucous gland ducts.

Q: A young patient presented with features of pneumonia, X-ray showed a lung abscess and a bulging fissure. Which of the following is the most likely causative organism?

Klebsiella. ### Explanation The clinical presentation of pneumonia associated with a **lung abscess** and a **bulging fissure** on chest X-ray is a classic diagnostic hallmark for **Klebsiella pneumoniae**. **1. Why Klebsiella is correct:** * **Bulging Fissure Sign:** *Klebsiella* pneumonia is characterized by a heavy, thick, mucoid (currant-jelly) inflammatory exudate. This voluminous exudate causes the affected lobe to expand, resulting in the downward displacement or "bulging" of the adjacent interlobar fissure. * **Tissue Necrosis:** It is a necrotizing pneumonia, frequently leading to cavitation and lung abscess formation, especially in patients with predisposing factors like alcoholism or diabetes mellitus [1]. **2. Why other options are incorrect:** * **Staphylococcus aureus:** While it commonly causes lung abscesses and pneumatoceles (especially post-influenza), it does not typically produce the voluminous exudate required to cause a bulging fissure [1]. * **Pneumocystis jirovecii (formerly carinii):** Typically presents as bilateral, diffuse interstitial infiltrates ("ground-glass opacities") in immunocompromised patients. It does not cause lobar consolidation or bulging fissures. * **Cytomegalovirus (CMV):** Usually presents as viral interstitial pneumonitis with diffuse involvement rather than localized abscesses or lobar expansion. **3. High-Yield Clinical Pearls for NEET-PG:** * **Classic Sputum:** "Currant-jelly" sputum (thick and blood-tinged). * **Risk Groups:** Most common in chronic alcoholics, diabetics, and the elderly [1]. * **Radiology:** Predilection for the **upper lobes** (specifically the right upper lobe). * **Friedländer’s Bacillus:** An older name for *Klebsiella pneumoniae*.

Q: All of the following are seen in Kartagener syndrome except?

Azoospermia. **Explanation:** Kartagener syndrome is a subset of **Primary Ciliary Dyskinesia (PCD)**, an autosomal recessive disorder characterized by a structural defect in the **dynein arms** of cilia. This leads to impaired mucociliary clearance and ciliary immotility throughout the body [1]. **Why Azoospermia is the correct answer (the "Except"):** In Kartagener syndrome, males typically present with **infertility**, but not azoospermia. The sperm count is usually normal, but the sperm are **immotile** because the flagella (which share the same microtubular structure as cilia) cannot beat. Azoospermia (absence of sperm) is characteristic of conditions like Cystic Fibrosis (due to congenital bilateral absence of the vas deferens) or obstructive pathologies, not PCD [2]. **Analysis of Incorrect Options:** * **Situs Inversus:** This is the hallmark of Kartagener syndrome (seen in 50% of PCD cases). It occurs because ciliary motion is essential for the normal left-right rotation of internal organs during embryonic development. * **Bronchiectasis:** Chronic failure of the "mucociliary escalator" leads to recurrent lower respiratory tract infections, eventually causing permanent dilation of the bronchi [1]. * **Sinusitis:** Impaired clearance of mucus from the paranasal sinuses leads to chronic inflammation and recurrent sinusitis [1]. **High-Yield Clinical Pearls for NEET-PG:** * **The Triad:** Kartagener syndrome is defined by the triad of **Situs inversus, Bronchiectasis, and Sinusitis.** [1] * **Diagnosis:** The screening test of choice is the **Saccharin test** (delayed transit time), while the gold standard is **Electron Microscopy** showing dynein arm defects. * **Female Infertility:** Females also face reduced fertility due to impaired ciliary action in the fallopian tubes, increasing the risk of ectopic pregnancies. * **Dextrocardia:** Often the first clue on a chest X-ray in these patients.

Q: Pulmonary hypertension in COPD is due to?

Constriction of pulmonary vessels. The primary mechanism for the development of Pulmonary Hypertension (PH) in COPD is **Hypoxic Pulmonary Vasoconstriction (HPV)**. In COPD, chronic alveolar hypoxia triggers the smooth muscles in the pulmonary arterioles to constrict. This is a physiological compensatory mechanism intended to divert blood flow away from poorly ventilated areas to better-ventilated ones (improving V/Q matching). However, when hypoxia is generalized, it leads to widespread **constriction of pulmonary vessels**, increasing pulmonary vascular resistance and resulting in PH [1]. **Analysis of Options:** * **A. Constriction of pulmonary vessels (Correct):** This is the direct hemodynamic cause of increased pressure [1]. Chronic constriction eventually leads to vascular remodeling (intimal hyperplasia and smooth muscle hypertrophy), making the PH permanent. * **B. Hypoxia (Incorrect):** While hypoxia is the *trigger* or the underlying stimulus, the question asks for the mechanism *due to* which PH occurs. Hypoxia causes PH *via* the constriction of vessels. * **C. Interstitial fibrosis (Incorrect):** This is the hallmark of Restrictive Lung Diseases (like IPF), not COPD (which is an obstructive disease characterized by alveolar destruction/emphysema) [3]. * **D. Bronchoconstriction (Incorrect):** This refers to the narrowing of the airways, which causes airflow obstruction but does not directly increase pulmonary arterial pressure. **Clinical Pearls for NEET-PG:** * **Cor Pulmonale:** PH in COPD eventually leads to right ventricular hypertrophy and failure, known as Cor Pulmonale. * **ECG Findings:** Look for 'P-pulmonale' (tall, peaked P waves in lead II) and right axis deviation. * **Management:** Long-term oxygen therapy (LTOT) is the only intervention proven to slow the progression of PH in COPD by reducing hypoxic vasoconstriction [2].

Q: Right hemithorax with right side shift of the mediastinum is due to which of the following conditions?

Collapse of the right lung. **Explanation:** The direction of mediastinal shift is a critical diagnostic clue in evaluating an opaque hemithorax on a chest X-ray. The fundamental principle is whether the pathology **pulls** or **pushes** the mediastinum. **1. Why Option A is Correct:** **Collapse (Atelectasis)** of the right lung leads to a significant loss of lung volume. This creates negative intrathoracic pressure on the affected side, which acts as a vacuum, **pulling** the mediastinum, trachea, and heart toward the side of the lesion (ipsilateral shift). Therefore, a right-sided collapse causes a right-sided mediastinal shift. **2. Why the Other Options are Incorrect:** * **Options B (Hemothorax) and C (Hydrothorax):** These represent pleural effusions (blood and fluid, respectively). Large accumulations of fluid occupy space and increase pressure within the pleural cavity, **pushing** the mediastinum away from the affected side (contralateral shift). In a right-sided effusion, the mediastinum shifts to the left. * **Option D (Bronchiectasis):** While chronic bronchiectasis can lead to secondary fibrosis and some volume loss, it typically does not cause a massive mediastinal shift unless it is associated with total lung collapse or extensive unilateral destruction. **Clinical Pearls for NEET-PG:** * **Ipsilateral Shift (Towards the lesion):** Think **"Pull"** pathologies — Lung collapse, Pneumonectomy, or Pleural fibrosis/Fibrothorax. * **Contralateral Shift (Away from the lesion):** Think **"Push"** pathologies — Tension pneumothorax, Large pleural effusion, or Massive intrathoracic tumors [1]. * **No Shift:** If a complete opacification of the hemithorax occurs without any mediastinal shift, suspect a **bronchogenic carcinoma** where the collapse (pull) is balanced by the presence of a large hilar mass or associated effusion (push).

Question 1

What is the best and earliest bedside clinical sign of respiratory pump failure?

Accepted Answer

Paradoxical respiratory motions (abdominal respiration or paradox)

Answer

Use of intercostal muscles (accessory muscles of respiration)

Answer

Tachypnea

Answer

Cyanosis

Question 2

A high amylase level in pleural fluid suggests which diagnosis?

Accepted Answer

Malignancy

Answer

Tuberculosis

Answer

Rheumatoid arthritis

Answer

Pulmonary infarction

Question 3

The complication least likely to occur in a case of chronic bronchitis is:

Accepted Answer

Spontaneous pneumothorax

Answer

Pulmonary hypertension

Answer

Respiratory acidosis

Answer

Polycythemia

Question 4

The CURB-65 score is used in pneumonia to assess which of the following?

Accepted Answer

Severity

Answer

Complication

Answer

Etiology

Answer

Prognosis

Question 5

Which of the following is true about asthma?

Accepted Answer

Increase in IgE in idiosyncratic asthma

Answer

Increasing incidence day by day

Answer

Allergic asthma is common in older patients

Answer

Bronchoconstriction

Question 6

A young patient presented with features of pneumonia, X-ray showed a lung abscess and a bulging fissure. Which of the following is the most likely causative organism?

Accepted Answer

Klebsiella

Answer

Staphylococcus

Answer

Pneumocystis carinii infection

Answer

Cytomegalovirus (CMV)

Question 7

All of the following are seen in Kartagener syndrome except?

Accepted Answer

Azoospermia

Answer

Bronchiectasis

Answer

Situs inversus

Answer

Sinusitis

Question 8

Pulmonary hypertension in COPD is due to?

Accepted Answer

Constriction of pulmonary vessels

Answer

Hypoxia

Answer

Interstitial fibrosis

Answer

Bronchoconstriction

Question 9

Right hemithorax with right side shift of the mediastinum is due to which of the following conditions?

Accepted Answer

Collapse of the right lung

Answer

Right-sided hemothorax

Answer

Right-sided hydrothorax

Answer

Bronchiectasis

Question 10

All of the following statements about central cyanosis are true EXCEPT?

Accepted Answer

Central cyanosis becomes evident when reduced hemoglobin is > 5 g/dL

Answer

Chronic asthma may cause central cyanosis

Answer

Alveolar hypoventilation causes central cyanosis

Answer

Methemoglobinemia causes central cyanosis

Pulmonology — MCQs

Pulmonology — MCQs

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