Pulmonology Practice Questions

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

Tracheobronchial tree. **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.

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: In ARDS, which type of respiratory failure occurs?

Type I. ### 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** ($PaO_2 50$ 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).

Q: Which of the following increases the risk of developing tuberculosis?

Silicosis. **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].

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

Pneumothorax. ### 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].

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.

Question 1

Platypilea is seen in which of the following conditions?

Accepted Answer

Pleural effusion

Answer

Diaphragmatic palsy

Answer

Pulmonary embolism

Answer

Left atrial tumor

Question 2

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 3

What is the most common site of bleeding in hemoptysis?

Accepted Answer

Tracheobronchial tree

Answer

Pulmonary parenchyma

Answer

Pleural disease

Answer

All the above

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

In ARDS, which type of respiratory failure occurs?

Accepted Answer

Type I

Answer

Type II

Answer

Type III

Answer

Type IV

Question 6

Which of the following increases the risk of developing tuberculosis?

Accepted Answer

Silicosis

Answer

Asbestosis

Answer

Sarcoidosis

Answer

Berylliosis

Question 7

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 8

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

Accepted Answer

Pneumothorax

Answer

Pleural effusion

Answer

Lobar pneumonia

Answer

Myocardial infarct

Question 9

What is the commonest cause of lung abscess?

Accepted Answer

Aspiration of oropharyngeal secretions

Answer

Tuberculosis

Answer

Congenital

Answer

Hematogenous

Question 10

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

Pulmonology — MCQs

Pulmonology — MCQs

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