Pulmonology — MCQs

Pulmonology Indian Medical PG Practice Questions and MCQs

Question 291: Platypilea is seen in which of the following conditions?

A. Diaphragmatic palsy
B. Pleural effusion (Correct Answer)
C. Pulmonary embolism
D. Left atrial tumor

Explanation: **Explanation:** **Platypnea** is a clinical symptom characterized by shortness of breath (dyspnea) that is induced by sitting or standing and is relieved by lying flat (recumbent position). It is the opposite of orthopnea. **Why Pleural Effusion is correct:** In patients with a large **pleural effusion**, changing from a supine to an upright position can cause the fluid to shift due to gravity, compressing the lower lung zones and increasing the work of breathing. Additionally, in specific cases like **Hepatopulmonary Syndrome** (often associated with liver cirrhosis), platypnea occurs because gravity increases blood flow to dilated basal pulmonary capillaries when upright, worsening the ventilation-perfusion (V/Q) mismatch and causing "Orthodeoxia" (hypoxemia triggered by an upright posture). **Analysis of Incorrect Options:** * **Diaphragmatic Palsy:** Typically presents with **orthopnea** (difficulty breathing when lying flat) because the abdominal contents push against the weakened diaphragm, further reducing lung volume [1]. * **Pulmonary Embolism:** Usually presents with acute, sudden-onset dyspnea that is generally independent of posture. * **Left Atrial Tumor (e.g., Atrial Myxoma):** Classically associated with **"Platypnea-Orthodeoxia Syndrome"** if it obstructs the mitral valve or triggers an atrial shunt, but in the context of standard NEET-PG questions, large pleural effusions or hepatopulmonary syndrome are the primary associations for postural dyspnea variations. **High-Yield Clinical Pearls for NEET-PG:** * **Platypnea-Orthodeoxia Syndrome:** The combination of platypnea and orthodeoxia. It is most commonly seen in **Hepatopulmonary Syndrome** and **Patent Foramen Ovale (PFO)**. * **Trepopnea:** Dyspnea that occurs when lying on one side but not the other (seen in unilateral lung disease or unilateral pleural effusion). * **Orthopnea:** Most commonly associated with **Congestive Heart Failure (CHF)** and **COPD/Asthma** [1], [2].

Question 292: In a patient of Bronchial Asthma, what does a silent chest signify?

A. Good prognosis
B. Bad prognosis
C. Grave prognosis (Correct Answer)
D. Not a prognostic sign

Explanation: **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].

Question 293: What is the most common site of bleeding in hemoptysis?

A. Tracheobronchial tree (Correct Answer)
B. Pulmonary parenchyma
C. Pleural disease
D. All the above

Explanation: **Explanation:** The most common site of bleeding in hemoptysis is the **tracheobronchial tree**. To understand this, one must differentiate between the two circulatory systems of the lungs: the **Bronchial Circulation** (high pressure, systemic) and the **Pulmonary Circulation** (low pressure). 1. **Why Tracheobronchial Tree is Correct:** Approximately 90% of hemoptysis cases originate from the bronchial arteries, which supply the tracheobronchial tree [2]. Because these arteries arise from the aorta, they are under high systemic pressure. Common conditions like **acute/chronic bronchitis**, **bronchiectasis**, and **bronchogenic carcinoma** cause inflammation or neovascularization in this region, leading to vessel rupture and bleeding [1], [3]. 2. **Why Other Options are Incorrect:** * **Pulmonary Parenchyma:** While conditions like pneumonia, lung abscesses, or Goodpasture syndrome involve the parenchyma, they are statistically less frequent causes of hemoptysis compared to airway-based diseases [1]. Bleeding here often involves the low-pressure pulmonary capillary system. * **Pleural Disease:** Pleural diseases (like pleurisy or mesothelioma) typically present with chest pain or pleural effusion. While they can cause secondary lung involvement, the pleura itself is not a primary source of expectorated blood. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of hemoptysis (Worldwide):** Tuberculosis. * **Most common cause of hemoptysis (Developed countries):** Bronchitis. * **Massive Hemoptysis:** Defined as >200–600 mL of blood in 24 hours. The immediate priority is airway protection and placing the patient in the **lateral decubitus position** (bleeding side down). * **Gold Standard Investigation:** For localized massive hemoptysis, **Bronchoscopy** is the initial procedure of choice, while **Bronchial Artery Embolization (BAE)** is the preferred non-surgical treatment for persistent bleeding.

Question 294: 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?

A. Small cell carcinoma
B. Non-small cell carcinoma (Correct Answer)
C. Fungal infection
D. Tuberculosis

Explanation: **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.

Question 295: In ARDS, which type of respiratory failure occurs?

A. Type I (Correct Answer)
B. Type II
C. Type III
D. Type IV

Explanation: ### Explanation **Correct Answer: A. Type I** **Why Type I is correct:** Acute Respiratory Distress Syndrome (ARDS) is characterized by non-cardiogenic pulmonary edema resulting from increased alveolar-capillary permeability [2]. This leads to severe **ventilation-perfusion (V/Q) mismatch** and **intrapulmonary shunting** [1]. The primary physiological hallmark is profound **hypoxemia** ($PaO_2 < 60$ mmHg) with a normal or low $PaCO_2$ [1]. This defines **Type I (Hypoxemic) Respiratory Failure**, where the failure lies in the gas exchange membrane rather than the ventilatory pump [3]. **Why other options are incorrect:** * **Type II (Hypercapnic):** This is "ventilatory failure" characterized by $PaCO_2 > 50$ mmHg [1]. It occurs due to reduced minute ventilation (e.g., COPD, neuromuscular disorders, or CNS depression). In early ARDS, patients usually hyperventilate, causing hypocapnia, not hypercapnia. * **Type III (Perioperative):** This occurs due to lung atelectasis in the postoperative period, often following abdominal or thoracic surgery. * **Type IV (Shock):** This is respiratory failure secondary to hypoperfusion (shock), where respiratory muscles consume a disproportionate amount of oxygen, leading to lactic acidosis. **High-Yield Clinical Pearls for NEET-PG:** * **Berlin Criteria for ARDS:** Acute onset (within 1 week), bilateral opacities on imaging not fully explained by effusions/collapse, and $PaO_2/FiO_2$ ratio $\leq 300$ mmHg with PEEP $\geq 5$ $cmH_2O$ [2]. * **Management Gold Standard:** Lung Protective Ventilation Strategy (Low tidal volume: 6 mL/kg of predicted body weight) and Prone Positioning. * **Radiology:** Characterized by "Baby Lung" phenomenon (only small portions of the lung remain aerated).

Question 296: Which of the following increases the risk of developing tuberculosis?

A. Asbestosis
B. Sarcoidosis
C. Silicosis (Correct Answer)
D. Berylliosis

Explanation: **Explanation:** **Silicosis** is a well-established risk factor for the development of tuberculosis (TB), a clinical association often referred to as **Silicotuberculosis**. The underlying medical concept involves the impairment of **alveolar macrophages** [1]. Silica particles are highly cytotoxic; when inhaled, they are ingested by macrophages, leading to lysosomal rupture and macrophage death. This significantly impairs cell-mediated immunity within the lungs, reducing the body's ability to contain *Mycobacterium tuberculosis*. Patients with silicosis have a 3-fold to 30-fold increased risk of developing TB compared to the general population. **Analysis of Incorrect Options:** * **Asbestosis:** While asbestos exposure significantly increases the risk of bronchogenic carcinoma and mesothelioma [2], it does not specifically predispose patients to mycobacterial infections. * **Sarcoidosis:** This is a multisystem granulomatous disease. While it may radiologically mimic TB, it is not a direct predisposing factor for contracting TB. In fact, corticosteroids used to treat sarcoidosis are more likely to be the risk factor for reactivation rather than the disease itself. * **Berylliosis:** Similar to sarcoidosis, this causes granulomatous lung disease [1] but lacks the specific macrophage-disrupting mechanism that makes silicosis a high-risk factor for TB. **High-Yield Facts for NEET-PG:** * **Eggshell Calcification:** Characteristic of hilar lymph nodes in silicosis (though also seen in sarcoidosis). * **Upper Lobe Predominance:** Silicosis primarily affects the upper lobes [1], similar to post-primary TB. * **Screening:** All patients diagnosed with silicosis should undergo a baseline Tuberculin Skin Test (TST) or IGRA. * **Other TB Risk Factors:** HIV (strongest risk factor), Diabetes Mellitus, Chronic Renal Failure, and TNF-alpha inhibitors [3].

Question 297: What is the commonest etiological factor in acute exacerbations of COPD?

A. Viral infections
B. Bacterial infections (Correct Answer)
C. Particulate air pollutants
D. Idiopathic

Explanation: **Explanation:** Acute Exacerbation of COPD (AECOPD) is defined as an acute worsening of respiratory symptoms that results in additional therapy. Identifying the trigger is crucial for management. **1. Why Bacterial Infections are Correct:** Bacterial infections are the most common identifiable cause, accounting for approximately **40-50%** of all exacerbations. The pathophysiology involves an increase in bacterial load or the acquisition of a new strain in the lower airways, leading to increased airway inflammation. The most common organisms isolated are *Haemophilus influenzae* (most common), *Streptococcus pneumoniae*, and *Moraxella catarrhalis*. In advanced disease (GOLD Stage III/IV), *Pseudomonas aeruginosa* becomes a significant pathogen. **2. Analysis of Incorrect Options:** * **Viral Infections (Option A):** These are the second most common cause (approx. 30%). Respiratory syncytial virus (RSV) and Rhinovirus are frequent triggers, often predisposing the patient to secondary bacterial infections. * **Particulate Air Pollutants (Option C):** Environmental factors like nitrogen dioxide, ozone, and particulate matter can trigger exacerbations, but they represent a smaller percentage of cases compared to infectious etiologies. * **Idiopathic (Option D):** While about 20-30% of exacerbations have no clearly identifiable cause despite investigation, they do not constitute the "commonest" group. **NEET-PG High-Yield Pearls:** * **Anthonisen Criteria:** Used to decide on antibiotic therapy. It includes increased dyspnea, increased sputum volume, and increased sputum purulence. * **Antibiotic Choice:** Macrolides (Azithromycin), Cephalosporins, or Amoxicillin-Clavulanate are first-line. * **Cardinal Sign:** Increased sputum purulence is the most reliable indicator of a bacterial etiology. * **Non-Infectious Triggers:** Pulmonary embolism and congestive heart failure can mimic AECOPD and should be ruled out in refractory cases.

Question 298: Sudden onset of a cough followed by increasing dyspnea is characteristic of which of the following conditions?

A. Pleural effusion
B. Lobar pneumonia
C. Myocardial infarct
D. Pneumothorax (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Pneumothorax** **Mechanism:** A **spontaneous pneumothorax** occurs when air enters the pleural space, typically due to the rupture of a subpleural bleb or bulla [1]. This leads to a sudden loss of negative intrapleural pressure, causing the lung to collapse. The clinical hallmark is the **abrupt onset** of sharp, pleuritic chest pain and a **dry cough**, immediately followed by **progressive dyspnea**. The cough is thought to be triggered by the irritation of the pleura or the rapid collapse of airways. **Why other options are incorrect:** * **Pleural Effusion:** This typically presents with **insidious (gradual) onset** of dyspnea and dull aching chest pain. It does not present with sudden, dramatic symptoms unless associated with trauma (hemothorax). * **Lobar Pneumonia:** This is characterized by a **prodrome** of fever, chills, and a productive cough (rusty sputum) [3]. While dyspnea occurs, it develops over hours to days, not instantaneously. * **Myocardial Infarct:** While the onset is sudden, the primary symptom is **crushing substernal chest pain** (angina). While dyspnea can occur (heart failure), a cough is not a characteristic initial feature of an MI. **High-Yield Clinical Pearls for NEET-PG:** * **Physical Exam Triad for Pneumothorax:** Hyper-resonant percussion note, absent/diminished breath sounds, and decreased vocal fremitus on the affected side. * **Tension Pneumothorax:** Look for **hemodynamic instability** (hypotension) and **tracheal deviation** to the contralateral side [2]. This is a clinical diagnosis; do not wait for an X-ray. * **Classic Patient Profile:** Primary spontaneous pneumothorax is most common in **tall, thin young males** (ectomorphic build) and is strongly associated with **smoking** [1]. * **Radiology:** The gold standard is a Chest X-ray (PA view) showing a **visceral pleural line** with an absence of peripheral lung markings [2].

Question 299: What is the commonest cause of lung abscess?

A. Tuberculosis
B. Congenital
C. Hematogenous
D. Aspiration of oropharyngeal secretions (Correct Answer)

Explanation: **Explanation:** **Correct Answer: D. Aspiration of oropharyngeal secretions** The primary mechanism for the development of a lung abscess is the **aspiration of oropharyngeal secretions** containing high concentrations of bacteria [1]. This occurs most frequently in patients with impaired consciousness (e.g., alcoholism, seizures, general anesthesia) or swallowing dysfunction (e.g., stroke, esophageal disorders). The aspirated material, often containing anaerobic bacteria from the gingival crevices, settles in dependent segments of the lung, leading to localized pneumonitis, tissue necrosis, and cavity formation [3]. **Analysis of Incorrect Options:** * **A. Tuberculosis:** While *Mycobacterium tuberculosis* causes cavitary lesions (especially in the upper lobes), these are traditionally classified as "tuberculous cavities" rather than pyogenic lung abscesses [2]. * **B. Congenital:** Congenital malformations like bronchogenic cysts or sequestration can become infected, but they represent a rare underlying substrate rather than a common primary cause. * **C. Hematogenous:** This occurs via septic emboli (e.g., tricuspid endocarditis or IV drug use). While a recognized cause, it is significantly less common than the bronchogenic (aspiration) route. **High-Yield Clinical Pearls for NEET-PG:** * **Microbiology:** Most lung abscesses are **polymicrobial**, with **anaerobes** (e.g., *Peptostreptococcus*, *Fusobacterium*, *Bacteroides*) being the most common isolates. * **Commonest Site:** The **posterior segment of the right upper lobe** and the **superior segment of the right lower lobe** are the most frequent sites due to the vertical orientation of the right main bronchus and gravity. * **Clinical Sign:** Patients often present with foul-smelling (putrid) sputum, which is pathognomonic for anaerobic infection. * **Treatment:** Prolonged antibiotic therapy (often 4–6 weeks) is the mainstay [4]. Surgery is rarely required unless the abscess is giant or refractory to medical management [4].

Question 300: Bibasilar velcro crackles are most commonly heard in which of the following conditions?

A. Acute pulmonary edema
B. Acute bronchopneumonia
C. Pulmonary fibrosis (Correct Answer)
D. Pulmonary embolism

Explanation: **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.

Practice by Chapter

Obstructive Airway Diseases (Asthma, COPD)

Practice Questions

Interstitial Lung Diseases

Practice Questions

Pulmonary Infections

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Pulmonary Vascular Diseases

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Pleural Diseases

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Sleep-Disordered Breathing

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Respiratory Failure

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Mediastinal Disorders

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Occupational Lung Diseases

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Pulmonary Function Testing

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Bronchiectasis and Cystic Fibrosis

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Lung Cancer Approach

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