Pulmonology — MCQs

Pulmonology Indian Medical PG Practice Questions and MCQs

Question 771: All of the following can cause a chronic cough EXCEPT which of the following?

A. ACE inhibitors
B. GERD
C. Chronic bronchitis
D. Acute bronchitis (Correct Answer)

Explanation: ***Acute bronchitis*** - This condition is characterized by a **self-limiting inflammatory process** of the bronchi, typically lasting **1 to 3 weeks** [1]. - While it causes a cough, it is, by definition, an **acute condition** and does not lead to a chronic cough [1]. *Chronic bronchitis* - Defined by a cough that is present for at least **3 months of the year for 2 consecutive years**. - It is a significant cause of chronic cough, often associated with **smoking** and exposure to pollutants. *ACE inhibitors* - A common side effect of **angiotensin-converting enzyme (ACE) inhibitors** is a persistent dry cough, which can be chronic. - This cough is thought to be due to the accumulation of **bradykinin** and **substance P** in the airways. *GERD* - **Gastroesophageal reflux disease (GERD)** can cause a chronic cough, even in the absence of typical heartburn symptoms. - Refluxed stomach acid can irritate the **esophagus** and trigger a **vagal reflex**, leading to coughing.

Question 772: A patient with a history of chronic bronchitis presents with peripheral cyanosis and bilateral leg swelling. Which pathophysiological mechanism is most likely responsible?

A. Decreased hemoglobin concentration
B. Increased arterial oxygen saturation
C. Venous stasis
D. Pulmonary hypertension leading to right-sided heart failure (Correct Answer)

Explanation: Detailed pathophysiological mechanism: Pulmonary hypertension leading to right-sided heart failure. Chronic bronchitis causes hypoxia, leading to pulmonary vasoconstriction and pulmonary hypertension. This increased pressure overworks the right ventricle, causing it to fail and resulting in peripheral edema (leg swelling) and cyanosis due to poor oxygenation [3]. Decreased hemoglobin concentration: A low hemoglobin concentration (anemia) would primarily cause pallor and fatigue, not typically peripheral cyanosis [2]. While anemia can exacerbate symptoms in heart failure, it's not the primary cause of cyanosis or leg swelling in chronic bronchitis. Increased arterial oxygen saturation: Increased arterial oxygen saturation would alleviate cyanosis, not cause it. Chronic bronchitis is characterized by impaired gas exchange and reduced oxygen saturation [4]. Venous stasis: Venous stasis can cause leg swelling, but it is usually a consequence of conditions like right-sided heart failure, not the primary pathophysiological mechanism [1]. It would not explain the peripheral cyanosis in the context of chronic bronchitis.

Question 773: A 48F, COPD history is admitted with increasing dyspnea and cyanosis. Blood gas analysis reveals pH 7.32, PaCO2 60 mmHg, and PaO2 50 mmHg. Most appropriate management step?

A. Administer intravenous antibiotics
B. Initiate NIPPV (Correct Answer)
C. Provide high-flow oxygen therapy
D. Immediate intubation and mechanical ventilation

Explanation: ***Initiate NIPPV*** - The patient's **pH 7.32 (acidemia)**, **PaCO2 60 mmHg (hypercapnia)**, and **PaO2 50 mmHg (hypoxemia)** indicate **acute hypercapnic respiratory failure** in the context of COPD exacerbation [1], [2]. - **Non-invasive positive pressure ventilation (NIPPV)**, such as BiPAP, is the cornerstone of managing acute exacerbations of COPD with respiratory acidosis, as it improves gas exchange and reduces work of breathing without the risks of intubation. *Administer intravenous antibiotics* - While infections are a common trigger for COPD exacerbations and antibiotics may be indicated, treating **respiratory failure** with antibiotics alone is insufficient and does not address the immediate life-threatening gas exchange abnormality. - Antibiotics are a supportive measure, but not the **most appropriate initial management step** for this degree of respiratory acidosis and hypoxemia. *Provide high-flow oxygen therapy* - Administering **high-flow oxygen** in a patient with COPD and **hypercapnic respiratory failure** may worsen hypercapnia by blunting the hypoxic drive and increasing V/Q mismatch [3], [4]. - While supplemental oxygen is necessary to treat hypoxemia, aggressive oxygen therapy without ventilatory support in this context can be detrimental if not closely monitored for CO2 retention [3]. *Immediate intubation and mechanical ventilation* - **Immediate intubation** is an invasive procedure with associated risks and is typically reserved for patients who fail NIPPV, have contraindications to NIPPV, or present with severe, life-threatening respiratory distress (e.g., altered mental status, hemodynamic instability, severe acidosis unresponsive to initial measures). - Given the patient's current ABG, **NIPPV** should be trialed first as it is a less invasive and often effective intervention for this presentation [1].

Question 774: Which of the following is the most effective diagnostic test to differentiate between central and peripheral cyanosis in a patient with hypoxia?

A. Arterial blood gas analysis (Correct Answer)
B. Pulse oximetry
C. Chest X-ray
D. Electrocardiogram

Explanation: ***Arterial blood gas analysis*** - An **arterial blood gas (ABG)** can definitively measure the **partial pressure of oxygen (PaO2)** and **oxygen saturation (SaO2)**, which are crucial for differentiating the physiological causes of hypoxia leading to central versus peripheral cyanosis [2]. - In **central cyanosis**, both PaO2 and SaO2 are low, indicating inadequate oxygenation of arterial blood, whereas in **peripheral cyanosis**, SaO2 might be relatively normal in arterial blood, but tissue extraction of oxygen is increased. *Pulse oximetry* - **Pulse oximetry** measures **peripheral oxygen saturation (SpO2)**, which estimates arterial oxygen saturation [1]. - While useful for detecting hypoxemia, it doesn't provide information on PaO2, nor can it reliably differentiate between true arterial desaturation (central cyanosis) and local circulatory issues leading to increased oxygen extraction (peripheral cyanosis), especially in conditions like **shock** or **vasoconstriction** where peripheral perfusion is compromised. *Chest X-ray* - A **chest X-ray** is a structural imaging test used to evaluate the lungs and heart for abnormalities that might cause hypoxemia [2]. - While it can identify potential causes of hypoxia (e.g., **pneumonia**, **pulmonary edema**), it does not directly measure oxygen levels or differentiate between central and peripheral cyanosis. *Electrocardiogram* - An **electrocardiogram (ECG)** measures the **electrical activity of the heart** and is used to diagnose cardiac arrhythmias, ischemia, or structural heart abnormalities [3]. - While cardiac issues can lead to hypoxia and cyanosis, an ECG doesn't directly assess oxygenation status or differentiate between central and peripheral cyanosis.

Question 775: A 70-year-old smoker presents with chronic cough and hypoxia. What is the primary pathophysiological change in the alveoli contributing to hypoxia in emphysema?

A. Loss of alveolar surface area (Correct Answer)
B. Increased mucus production
C. Increased alveolar-capillary membrane thickness
D. Bronchial hyperreactivity

Explanation: ***Loss of alveolar surface area*** - In emphysema, the destructive process leads to the breakdown of **alveolar walls** [1], forming larger, fewer air sacs. This directly reduces the total **surface area available for gas exchange.** - A diminished surface area for gas exchange significantly impairs the transfer of oxygen into the blood, resulting in **hypoxia**. *Increased mucus production* - While chronic bronchitis (often coexisting with emphysema as part of COPD) does involve **increased mucus production** [2], it is not the primary pathophysiological change within the alveoli that causes hypoxia in emphysema. - Mucus primarily obstructs airways, leading to ventilation-perfusion mismatch, but the hallmark alveolar damage of emphysema is distinct. *Increased alveolar-capillary membrane thickness* - This change is characteristic of conditions like **pulmonary fibrosis** or **acute respiratory distress syndrome (ARDS)**, where interstitial fluid or fibrous tissue thickens the barrier between alveoli and capillaries [3]. - In emphysema, the primary issue is the **destruction** of the alveolar-capillary membrane, not its thickening, leading to reduced surface area and impaired gas exchange. *Bronchial hyperreactivity* - This is a key feature of **asthma**, where airways constrict excessively in response to various stimuli, leading to airflow obstruction. - While some patients with COPD (which includes emphysema) may exhibit a degree of bronchial hyperreactivity, it is not the **primary pathophysiological mechanism for alveolar hypoxia** in emphysema, which is centered on structural damage to the alveoli.

Question 776: A 60-year-old female with chronic obstructive pulmonary disease (COPD) presents with increasing dyspnea. A chest X-ray shows a flattened diaphragm and increased retrosternal air space. What is the most likely diagnosis?

A. Asthma
B. Emphysema (Correct Answer)
C. Pulmonary fibrosis
D. Pleural effusion

Explanation: Emphysema - The presence of **flattened diaphragm** and **increased retrosternal air space** on chest X-ray are classic signs of **hyperinflation**, which is characteristic of emphysema due to **air trapping**. - This condition is a common component of **COPD** and explains the patient's increasing **dyspnea** due to impaired gas exchange and mechanical disadvantages for breathing [1]. *Asthma* - While asthma also involves **airway obstruction**, a flattened diaphragm and increased retrosternal air space are less typical findings compared to emphysema, particularly in a patient with **chronic obstructive pulmonary disease (COPD)** [1]. - Asthma is characterized by **reversible airway hyperresponsiveness** and inflammation, distinct from the destructive changes seen in emphysema. *Pulmonary fibrosis* - **Pulmonary fibrosis** typically presents with a **restrictive lung pattern**, characterized by reduced lung volumes and often shows features like **interstitial infiltrates**, **honeycombing**, or **ground-glass opacities** on imaging, not hyperinflation [2]. - A flattened diaphragm and increased retrosternal air space are not seen in pulmonary fibrosis; instead, patients often have elevated diaphragms due to reduced lung volumes [2]. *Pleural effusion* - **Pleural effusion** is characterized by the accumulation of fluid in the **pleural space**, which would typically manifest as **blunting of costophrenic angles** or a **fluid level** on chest X-ray, not a flattened diaphragm or increased retrosternal air space. - While it can cause dyspnea, the radiographic findings are inconsistent with the classic signs of air trapping.

Question 777: A 45-year-old woman with a history of asthma presents with acute shortness of breath, wheezing, and chest tightness. What is the most appropriate initial treatment?

A. Inhaled corticosteroids
B. Oral corticosteroids
C. Inhaled bronchodilators (Correct Answer)
D. Leukotriene modifiers

Explanation: ***Inhaled bronchodilators*** - **Short-acting beta-2 agonists (SABAs)** like albuterol are the **first-line treatment** for acute asthma exacerbations, providing rapid relief of bronchoconstriction [1]. - They work by relaxing the **smooth muscle** around the airways, quickly reducing wheezing and shortness of breath. *Inhaled corticosteroids* - These are primarily used as **maintenance therapy** for long-term asthma control to reduce airway inflammation and prevent future attacks [1]. - They do not provide immediate relief for **acute symptoms** and are not appropriate as initial treatment for an exacerbation [1]. *Oral corticosteroids* - While effective for **severe acute asthma exacerbations**, they have a delayed onset of action and are typically reserved for patients who do not respond adequately to initial bronchodilator therapy [1]. - They are associated with more systemic side effects compared to inhaled options. *Leukotriene modifiers* - These medications (e.g., montelukast) are used for **long-term control** and prevention of asthma symptoms, particularly in patients with exercise-induced asthma or allergic rhinitis. - They have a **slower onset of action** and are not indicated for immediate relief of acute asthma symptoms.

Question 778: Which of the following conditions is commonly associated with nasal polyps?

A. Allergic rhinitis (Correct Answer)
B. Asthma
C. Cystic fibrosis
D. None of the options

Explanation: ***Allergic rhinitis*** - Allergic rhinitis is a common **atopic condition** that leads to chronic inflammation of the nasal passages, which is a significant predisposing factor for the development of **nasal polyps**. - The persistent inflammation and mucociliary dysfunction in allergic rhinitis can result in the **edematous growth** of the nasal mucosa, forming polyps. *Asthma* - While asthma can be comorbid with chronic rhinosinusitis and nasal polyps (all part of **aspirin-exacerbated respiratory disease**), it is not the primary direct cause of nasal polyps itself. - The association of asthma with nasal polyps is more often seen in the context of the **Samter's triad** (aspirin sensitivity, asthma, and nasal polyps). *Cystic fibrosis* - Patients with **cystic fibrosis** commonly develop nasal polyps due to the abnormal mucus production and chronic inflammation secondary to genetic mutations in the **CFTR gene**. - However, while strongly associated, it's not as common a cause in the general population as allergic rhinitis for adult-onset polyps. *None of the options* - This option is incorrect, as allergic rhinitis (and other conditions like cystic fibrosis) are well-known to be associated with nasal polyps.

Question 779: A 25-year-old male with a history of intravenous drug use presents with chest pain and hemoptysis. A chest X-ray shows a 'tram-track' appearance. What is the most likely diagnosis in this context?

A. Pulmonary tuberculosis
B. Pneumonia
C. Pulmonary embolism
D. Bronchiectasis (Correct Answer)

Explanation: ***Bronchiectasis*** - The combination of **intravenous drug use** (a risk factor due to potential septic emboli leading to recurrent infections), **chest pain**, **hemoptysis**, and a **"tram-track" appearance** on chest X-ray is highly suggestive of bronchiectasis [1]. - **"Tram-track" appearance** on chest X-ray indicates bronchial wall thickening and dilatation, characteristic findings in bronchiectasis [1, 3]. *Pulmonary tuberculosis* - While pulmonary tuberculosis can cause hemoptysis and chest pain, the characteristic X-ray finding is typically **cavitation** or **infiltrates**, not a "tram-track" appearance [1, 4]. - Though IV drug use can lead to immunosuppression increasing TB risk, the imaging finding points away from primary TB. *Pneumonia* - Pneumonia typically presents with **lobar or segmental consolidation** on chest X-ray, sometimes with air bronchograms [1]. - A "tram-track" appearance is not characteristic of acute pneumonia, although severe or recurrent pneumonia can contribute to the development of bronchiectasis over time [1]. *Pulmonary embolism* - Pulmonary embolism presents with sudden onset of **dyspnea, pleuritic chest pain**, and sometimes hemoptysis, often linked to risk factors for thrombosis [1]. - Chest X-ray findings in pulmonary embolism are often non-specific or show **Westermark sign** (oligemia) or **Hampton's hump** (wedge-shaped opacity), not "tram-track" signs.

Question 780: In a patient with a severe COPD exacerbation, what is the initial treatment of choice?

A. High-dose corticosteroids
B. Antibiotics
C. Oral corticosteroids
D. Oxygen therapy (Correct Answer)

Explanation: ***Oxygen therapy*** - In a severe **COPD exacerbation**, **hypoxemia** is a primary concern, and **oxygen therapy** is the initial and most critical intervention to maintain adequate tissue oxygenation. - The goal is to achieve an oxygen saturation of **88-92%** to avoid both hypoxemia and hypercapnia due to the blunted hypoxic drive. *High-dose corticosteroids* - While beneficial for reducing inflammation and shortening recovery time, **high-dose corticosteroids** are not the immediate first-line treatment for **life-threatening hypoxemia**. - They typically take several hours to exert their full therapeutic effect and are administered after oxygen therapy has been initiated and stabilized. *Antibiotics* - **Antibiotics** are indicated if there are signs of **bacterial infection**, such as increased sputum purulence or volume, fever, or evidence of pneumonia. - However, they are not the initial treatment for the **acute respiratory distress** caused by the exacerbation itself, as not all exacerbations are bacterial. *Oral corticosteroids* - **Oral corticosteroids** are used for their anti-inflammatory effects in COPD exacerbations but typically after the immediate stabilization of oxygenation. - In severe cases, **intravenous corticosteroids** might be preferred for faster onset and better absorption, but neither form is the very first step in managing acute respiratory failure.

Practice by Chapter

Obstructive Airway Diseases (Asthma, COPD)

Practice Questions

Interstitial Lung Diseases

Practice Questions

Pulmonary Infections

Practice Questions

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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