Pulmonology Practice Questions

Q: Kartagener’s syndrome is characterized by which of the following?

Situs Solitus. **Explanation:** Kartagener’s syndrome is a subset of **Primary Ciliary Dyskinesia (PCD)**, an autosomal recessive disorder caused by structural defects in the cilia (most commonly a deficiency of outer/inner dynein arms). This leads to impaired mucociliary clearance and organ lateralization defects [1]. **Why Situs Solitus is the Correct Answer (Context of the Question):** In the context of NEET-PG "except" or "characteristic" questions, it is vital to distinguish between normal and abnormal anatomy. **Situs Solitus** refers to the normal arrangement of thoracic and abdominal organs. Kartagener’s syndrome is classically defined by a **clinical triad**: 1. **Situs Inversus** (Transposition of organs) 2. **Bronchiectasis** [1] 3. **Chronic Sinusitis** [1] Therefore, **Situs Solitus is NOT a feature** of Kartagener’s syndrome; its presence (Situs Inversus) is what defines the syndrome within the spectrum of PCD. **Analysis of Options:** * **B. Dextrocardia:** This is a component of Situs Inversus where the heart is located on the right side. It is a hallmark finding in Kartagener’s. * **C. Chronic Sinusitis:** Due to dysfunctional cilia in the paranasal sinuses, patients suffer from recurrent infections and nasal polyps [1]. * **D. Situs Inversus:** This is the defining feature that differentiates Kartagener’s from other forms of Primary Ciliary Dyskinesia. **High-Yield Clinical Pearls for NEET-PG:** * **Infertility:** Males are infertile due to immotile spermatozoa (flagella defect); females have reduced fertility due to ciliary dysfunction in the fallopian tubes. * **Diagnosis:** Initial screening via **Nasal Nitric Oxide (nNO)** levels (low in PCD). Definitive diagnosis via **High-speed video microscopy** or **Electron microscopy** (showing dynein arm defects). * **Genetics:** Most common mutations involve **DNAI1 and DNAH5** genes.

Q: Hamman's sign is seen with which of the following conditions?

Esophageal perforation. ### Explanation **Hamman’s sign** (also known as Hamman’s crunch) is a clinical finding characterized by a **crunching, clicking, or rasping sound** heard over the precordium during auscultation. It is synchronous with the heartbeat and is caused by the heart beating against air-filled tissues. #### Why Esophageal Perforation is Correct: Esophageal perforation (e.g., **Boerhaave syndrome**) allows air to escape from the esophagus into the mediastinum, leading to **pneumomediastinum**. As the heart beats, it compresses this trapped air against the pleura and mediastinal structures, producing the characteristic "crunching" sound. This sign is most audible when the patient is in the left lateral decubitus position. #### Analysis of Incorrect Options: * **A. Acute pericarditis:** Characterized by a **pericardial friction rub**, which is a high-pitched, scratchy sound (triphasic or biphasic) caused by the inflamed layers of the pericardium rubbing together, not by air. * **B. Aortic dissection:** Typically presents with tearing chest pain radiating to the back and unequal pulses. While it can cause a murmur of aortic regurgitation, it does not produce Hamman’s sign. * **C. Tracheal compression:** Usually presents with **stridor** or wheezing due to narrowed airways, but it does not involve air in the mediastinal space. #### High-Yield Clinical Pearls for NEET-PG: * **Triad of Boerhaave Syndrome (Mackler’s Triad):** Vomiting, chest pain, and subcutaneous emphysema. * **Hamman’s Sign vs. Hamman-Rich Syndrome:** Do not confuse them. Hamman-Rich syndrome is an older term for **Acute Interstitial Pneumonia (AIP)**. * **Common Causes of Hamman’s Sign:** Pneumomediastinum (most common), esophageal rupture, and occasionally tension pneumothorax. * **Diagnosis:** If Hamman’s sign is heard, the next best step is often a **Chest X-ray** (looking for "continuous diaphragm sign" or "V sign of Naclerio") or a **CT Thorax**.

Q: In a patient of Bronchial Asthma, what does a silent chest signify?

Grave prognosis. **Explanation:** In Bronchial Asthma, the characteristic "wheeze" is produced by the turbulent flow of air through narrowed, inflamed airways. For a wheeze to be audible, there must be sufficient airflow to create this turbulence. **Why "Grave Prognosis" is correct:** A **"Silent Chest"** occurs when airway obstruction becomes so severe (due to extreme bronchoconstriction, mucus plugging, and muscle fatigue) that there is **insufficient air movement** to even generate a wheeze. This indicates impending respiratory failure. It is a clinical emergency often accompanied by other "danger signs" such as cyanosis, bradycardia, and altered sensorium [1]. It is termed a **grave prognosis** because, without immediate aggressive intervention (e.g., mechanical ventilation), the patient is at high risk of death [1]. **Analysis of Incorrect Options:** * **A & B:** While "Bad prognosis" (B) sounds plausible, "Grave" (C) is the standard medical terminology used for life-threatening conditions. "Good prognosis" (A) is incorrect as the absence of wheezing in a symptomatic patient indicates worsening, not improvement. * **D:** Physical exam findings are critical prognostic indicators in asthma; a silent chest is one of the most significant predictors of clinical deterioration. **NEET-PG High-Yield Pearls:** * **Paradoxical sign:** In asthma, the disappearance of a wheeze without clinical improvement is a sign of worsening, not recovery. * **ABG in Silent Chest:** Typically shows a "normal" or rising $PaCO_2$ [1]. In an acute attack, patients usually hyperventilate (low $PaCO_2$); a normal $PaCO_2$ indicates the patient is tiring and can no longer maintain respiratory effort [1]. * **Indications for Intubation:** Silent chest, exhaustion, rising $PaCO_2$, and altered mental status [1].

Q: A 60-year-old man presents with a non-productive cough and hemoptysis for 4 weeks. He has grade III clubbing and a lesion in the apical lobe on X-ray. What is the most likely diagnosis?

Non-small cell carcinoma. **Explanation:** The clinical presentation of a chronic cough, hemoptysis, and a localized apical lesion in an elderly patient is highly suspicious for bronchogenic carcinoma. The presence of **Grade III clubbing** is a crucial diagnostic clue. 1. **Why Non-Small Cell Carcinoma (NSCLC) is correct:** Clubbing is a common paraneoplastic manifestation of NSCLC, particularly **Adenocarcinoma** and **Squamous Cell Carcinoma**. Squamous cell carcinoma specifically has a predilection for the upper lobes (apical segments) and is strongly associated with smoking and hemoptysis. Hypertrophic Osteoarthropathy (HOA), which includes clubbing, is rarely seen in Small Cell Carcinoma. 2. **Why other options are incorrect:** * **Small Cell Carcinoma:** While it presents with central masses and hemoptysis, it is **not** typically associated with finger clubbing. It is more commonly associated with endocrine paraneoplastic syndromes like SIADH or ectopic ACTH. * **Tuberculosis (TB):** Although TB is a common cause of apical lesions and hemoptysis in India, it rarely causes significant finger clubbing unless there is extensive secondary bronchiectasis or chronic cavity formation. * **Fungal Infection:** Aspergillomas (fungal balls) can occur in old apical cavities and cause hemoptysis, but they do not typically present with Grade III clubbing. **Clinical Pearls for NEET-PG:** * **Clubbing in Lung Cancer:** Most commonly associated with NSCLC (Adenocarcinoma > Squamous cell). It is a "negative" marker for Small Cell Lung Cancer. * **Pancoast Tumor:** A subset of NSCLC (usually Squamous or Adeno) occurring at the superior sulcus (apex), presenting with Horner’s syndrome and brachial plexus involvement. * **Hypertrophic Pulmonary Osteoarthropathy (HPOA):** Characterized by the triad of clubbing, periostitis of long bones, and arthritis; strongly linked to NSCLC.

Q: All the following are true regarding COPD EXCEPT?

Decreased residual volume/total lung capacity ratio. **Explanation:** Chronic Obstructive Pulmonary Disease (COPD) is characterized by chronic airflow limitation due to airway narrowing (bronchitis) and loss of elastic recoil (emphysema). This leads to **air trapping** and **hyperinflation**. **Why Option C is the Correct Answer (The False Statement):** In COPD, the **Residual Volume (RV)** increases significantly more than the **Total Lung Capacity (TLC)**. Because the numerator (RV) increases disproportionately to the denominator (TLC), the **RV/TLC ratio actually increases** (often >30-40%). A decreased ratio is not seen in obstructive diseases; therefore, this statement is false. **Analysis of Incorrect Options (True Statements):** * **A. Increased Residual Volume:** Air trapping occurs because airways collapse during expiration (especially in emphysema). This prevents the lungs from emptying completely, leading to a pathologically high RV. * **B. Increased Total Lung Capacity:** To compensate for air trapping and reduced elastic recoil, the chest wall expands (barrel chest), leading to an increase in TLC (hyperinflation). * **D. Decreased Vital Capacity:** Since TLC = VC + RV, and the increase in RV is massive, the Vital Capacity (VC) is often reduced because the "trapped air" occupies space that would otherwise be available for usable lung volume. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Spirometry showing a post-bronchodilator **FEV1/FVC ratio < 0.70**. * **Flow-Volume Loop:** Shows a characteristic **"scooped-out"** appearance during expiration. * **Compliance:** Lung compliance is **increased** in emphysema due to the destruction of alveolar septa and elastic fibers. * **Diffusion Capacity (DLCO):** Characteristically **decreased** in emphysema but normal in pure chronic bronchitis.

Q: Bibasilar velcro crackles are most commonly heard in which of the following conditions?

Pulmonary fibrosis. **Explanation:** **Correct Answer: C. Pulmonary Fibrosis** The term **"Velcro crackles"** is a classic clinical descriptor for the fine, end-inspiratory, non-consonating crackles heard in **Interstitial Lung Diseases (ILD)**, most notably **Idiopathic Pulmonary Fibrosis (IPF)**. These sounds are produced by the sudden, explosive opening of small airways and alveoli that have become stiff and non-compliant due to fibrosis. They are typically heard at the lung bases (bibasilar) because gravity-dependent areas are most affected in early stages. Unlike crackles in fluid-filled states, these do not clear with coughing. **Analysis of Incorrect Options:** * **A. Acute Pulmonary Edema:** Characterized by "wet" or coarse crackles (crepitations) due to fluid in the alveoli. These are often accompanied by wheezing (cardiac asthma) and are not described as "Velcro-like." * **B. Acute Bronchopneumonia:** Presents with coarse crackles and signs of consolidation (bronchial breath sounds). These are usually localized to the affected lobe rather than being symmetrically bibasilar. * **C. Pulmonary Embolism:** Typically presents with clear lungs on auscultation. If an infarct occurs, a pleural friction rub may be heard, but bibasilar crackles are not a hallmark feature. **High-Yield Clinical Pearls for NEET-PG:** * **IPF Triad:** Progressive exertional dyspnea, bibasilar velcro crackles, and digital clubbing. * **HRCT Finding:** The gold standard for diagnosis is the "UIP pattern" (Usual Interstitial Pneumonia), showing subpleural honeycombing and traction bronchiectasis. * **Spirometry:** Shows a **Restrictive pattern** (Decreased FVC, Decreased TLC, but a Normal or Increased FEV1/FVC ratio). * **Early Sign:** Velcro crackles often precede radiological changes on a chest X-ray, making them a crucial early physical finding.

Q: Which investigation is known as the rule-out test in massive pulmonary embolism?

D-dimer. **Explanation:** The correct answer is **D-dimer**. In the diagnostic workup of Pulmonary Embolism (PE), a D-dimer assay is characterized by its **high sensitivity** (approx. 95-97%) but low specificity. Because it is highly sensitive, a negative result (typically <500 ng/mL) effectively excludes the diagnosis of PE in patients with a low-to-moderate clinical probability (Wells' Score). Therefore, it is clinically utilized as a **"rule-out" test**. **Analysis of Options:** * **A. ECG:** While common findings include sinus tachycardia or the classic S1Q3T3 pattern, ECG is neither sensitive nor specific enough to rule out or rule in PE [1]. It is primarily used to exclude other differentials like Myocardial Infarction [1]. * **B. Echocardiogram:** This is the initial investigation of choice in **hemodynamically unstable (massive) PE** to look for right ventricular (RV) strain (e.g., McConnell’s sign) [1]. However, a normal echo does not definitively rule out a smaller PE. * **D. Arterial Blood Gas (ABG):** ABG typically shows hypoxemia, hypocapnia, and respiratory alkalosis [1]. However, a significant percentage of patients with PE can have a normal A-a gradient and normal PaO2, making it unreliable as a rule-out tool. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA) [1]. * **Most Common ECG Finding:** Sinus Tachycardia [1]. * **Most Specific ECG Finding:** S1Q3T3 pattern (indicates acute cor pulmonale) [1]. * **Definitive/Reference Standard:** Conventional Pulmonary Angiography (rarely used now). * **Age-Adjusted D-dimer:** For patients >50 years, use (Age × 10 µg/L) as the cutoff to improve specificity.

Question 1

Kartagener’s syndrome is characterized by which of the following?

Accepted Answer

Situs Solitus

Answer

Dextrocardia

Answer

Chronic sinusitis

Answer

Situs inversus

Question 2

Hamman's sign is seen with which of the following conditions?

Accepted Answer

Esophageal perforation

Answer

Acute pericarditis

Answer

Aortic dissection

Answer

Tracheal compression

Question 3

In a patient of Bronchial Asthma, what does a silent chest signify?

Accepted Answer

Grave prognosis

Answer

Good prognosis

Answer

Bad prognosis

Answer

Not a prognostic sign

Question 4

A 60-year-old man presents with a non-productive cough and hemoptysis for 4 weeks. He has grade III clubbing and a lesion in the apical lobe on X-ray. What is the most likely diagnosis?

Accepted Answer

Non-small cell carcinoma

Answer

Small cell carcinoma

Answer

Fungal infection

Answer

Tuberculosis

Question 5

All the following are true regarding COPD EXCEPT?

Accepted Answer

Decreased residual volume/total lung capacity ratio

Answer

Increased residual volume

Answer

Increased total lung capacity

Answer

Decreased vital capacity

Question 6

What is the commonest etiological factor in acute exacerbations of COPD?

Accepted Answer

Bacterial infections

Answer

Viral infections

Answer

Particulate air pollutants

Answer

Idiopathic

Question 7

What is the commonest cause of lung abscess?

Accepted Answer

Aspiration of oropharyngeal secretions

Answer

Tuberculosis

Answer

Congenital

Answer

Hematogenous

Question 8

Bibasilar velcro crackles are most commonly heard in which of the following conditions?

Accepted Answer

Pulmonary fibrosis

Answer

Acute pulmonary edema

Answer

Acute bronchopneumonia

Answer

Pulmonary embolism

Question 9

Which investigation is known as the rule-out test in massive pulmonary embolism?

Accepted Answer

D-dimer

Answer

ECG

Answer

Echocardiogram

Answer

Arterial blood gas

Question 10

A 24-year-old African American woman presents with mild dyspnea on exertion, fever, and a rash on her legs. Her symptoms have come on gradually and she reports no pleuritic chest pain, hemoptysis, or sputum production. She has no significant past medical history, smokes 10 cigarettes/day, and is not taking any medications. Physical examination reveals generalized lymphadenopathy and tender erythematous nodules on her legs. CXR shows bilateral symmetric hilar adenopathy and reticulonodular changes in both lungs. She has a restrictive lung disease pattern on pulmonary function testing. Which of the following is the most likely diagnosis?

Accepted Answer

Sarcoidosis

Answer

Hodgkin's disease

Answer

Tuberculosis

Answer

Rheumatic fever

Pulmonology — MCQs

Pulmonology — MCQs

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