Pulmonology Practice Questions

Q: Which test is most useful for initial evaluation of suspected pulmonary sarcoidosis?

Bronchoalveolar lavage (BAL). ***Bronchoalveolar lavage (BAL)*** - While other tests provide supportive evidence, **BAL with differential cell count** is crucial for distinguishing sarcoidosis from other interstitial lung diseases by detecting a high CD4/CD8 ratio. - It allows for direct sampling of inflammatory cells and helps to exclude infections, making it a critical step in confirming the diagnosis, often combined with **transbronchial biopsy**, which can be facilitated through endobronchial ultrasound (EBUS) mapping [2]. *Cutaneous skin biopsy* - **Skin biopsies** are useful if there are visible skin lesions (seen in ~5% of patients), which can show non-caseating granulomas supporting sarcoidosis [1]. - However, sarcoidosis often presents without skin involvement, and a skin biopsy would not be the **initial diagnostic test** for suspected pulmonary disease. *Serum angiotensin-converting enzyme (ACE) levels* - Elevated **serum ACE levels** are found in some sarcoidosis patients and can support the diagnosis or monitor disease activity. - However, ACE levels are **not specific** to sarcoidosis and can be normal even in active disease, making it a less reliable primary diagnostic tool. *Chest radiograph (X-ray)* - A **chest X-ray** is often the first imaging study performed and can show findings like **bilateral hilar lymphadenopathy** or interstitial infiltrates, which are highly suggestive of sarcoidosis [1]. - While important for initial suspicion, a chest X-ray does not provide a definitive diagnosis and requires further investigation to confirm sarcoidosis and rule out other causes.

Q: Which is the most common complication of deep vein thrombosis (DVT)?

Pulmonary embolism. ***Pulmonary embolism*** - A **pulmonary embolism (PE)** occurs when a part of a **DVT** dislodges and travels to the lungs, blocking pulmonary arteries [1]. - It is the most serious and common life-threatening complication of **DVT**, with significant morbidity and mortality [1]. *Myocardial infarction (MI)* - **Myocardial infarction** is typically caused by **atherosclerosis** in the coronary arteries, not directly by a DVT. - While DVT and MI share some risk factors, DVT doesn't directly cause a heart attack. *Cerebrovascular accident (CVA)* - A **cerebrovascular accident (stroke)** is usually caused by a clot **originating in the heart** or **carotid arteries**, not typically from a lower extremity DVT. - Only in cases of a **patent foramen ovale** can a DVT cause a paradoxical embolism leading to stroke, which is rare [1]. *Renal failure* - **Renal failure** is a disease of the kidneys and is not a direct or common complication of a **DVT**. - DVTs primarily affect the venous system, and their complications mainly involve distal tissues or the pulmonary circulation.

Q: Which test is most sensitive for screening/detecting pulmonary involvement in sarcoidosis?

Chest X-ray. A **chest X-ray** is the most widely available and often the initial imaging modality performed in suspected sarcoidosis, showing characteristic patterns such as **bilateral hilar lymphadenopathy** [1]. While not confirmatory, its high sensitivity in detecting pulmonary involvement makes it a crucial preliminary diagnostic tool, especially given the frequency of lung involvement in sarcoidosis [1]. *Bronchoalveolar lavage* - **Bronchoalveolar lavage (BAL)** can show **lymphocytosis** with a high CD4/CD8 ratio, which is suggestive but not specific for sarcoidosis. - While supportive, BAL is an invasive procedure and less commonly the **initial diagnostic test** compared to a chest X-ray. *Serum ACE levels* - **Elevated serum angiotensin-converting enzyme (ACE)** levels can be found in sarcoidosis, reflecting granulomatous activity, but are neither sensitive nor specific enough for diagnosis. - ACE levels are elevated in only about **60% of patients** with active sarcoidosis and can be normal even in widespread disease, or elevated in other conditions. *Skin biopsy* - **Skin biopsy** can reveal **non-caseating granulomas** if there are cutaneous manifestations of sarcoidosis, which occur in about 20-30% of patients. - While diagnostic when positive, its use is limited to patients with **visible skin lesions** and it is not a screening test for systemic disease.

Q: A 50-year-old male presents with cyanosis and is diagnosed with chronic obstructive pulmonary disease (COPD). What is the primary mechanism causing his cyanosis?

Chronic hypoxemia. ***Chronic hypoxemia*** - **Chronic hypoxemia** is a hallmark of severe COPD, leading to insufficient oxygen in the arterial blood, which is the direct cause of cyanosis. [1] - The body compensates for ongoing hypoxemia by increasing **red blood cell production (polycythemia)**, which, when deoxygenated, becomes more visible as a bluish discoloration of the skin and mucous membranes. *Low cardiac output* - While low cardiac output can impair tissue oxygen delivery, it typically presents with signs of **poor perfusion** (e.g., cool extremities, altered mental status) rather than primary cyanosis in the absence of severe respiratory compromise. - In COPD, the primary issue is impaired gas exchange in the lungs, not usually a profound cardiac dysfunction leading to cyanosis, unless comorbid heart failure is present. *Carbon monoxide poisoning* - **Carbon monoxide (CO)** binds to hemoglobin with a much higher affinity than oxygen, forming carboxyhemoglobin, which is bright red. [3] - This typically leads to a **cherry-red appearance** rather than cyanosis, even in the presence of severe tissue hypoxia. [2] *Right-to-left shunt* - A **right-to-left shunt** allows deoxygenated blood to bypass the lungs and enter the systemic circulation, causing hypoxemia and cyanosis. [1] - While shunting can occur in severe COPD (e.g., due to ventilation-perfusion mismatch), the primary mechanism for generalized chronic cyanosis in COPD is the overall failure of the lungs to adequately oxygenate blood, classifying it as **chronic hypoxemia** rather than a specific anatomical shunt.

Q: A 55-year-old male with a history of bronchiectasis presents with acute onset of massive hemoptysis. What is the most appropriate immediate intervention?

Bronchoscopy. ***Bronchoscopy*** - **Bronchoscopy** is the immediate and most appropriate intervention for **massive hemoptysis** to localize the bleeding site, achieve hemostasis (e.g., with balloon tamponade), and protect the airway. - In a patient with **bronchiectasis**, damaged airways are prone to bleeding, making precise localization and control critical [1], [2]. *Thoracotomy* - **Thoracotomy** is a surgical procedure typically reserved for cases where bronchoscopic interventions fail to control life-threatening hemorrhage or when the bleeding source is inoperable via bronchoscopy. - It is a more invasive option and not the first-line immediate intervention for acute management. *Intravenous corticosteroids* - **Intravenous corticosteroids** are used to reduce inflammation in certain pulmonary conditions, but they do not directly address acute bleeding in massive hemoptysis. - They would not be an immediate intervention for stopping active hemorrhage and might even have adverse effects in an acutely ill patient. *Antibiotics* - **Antibiotics** treat bacterial infections, which can sometimes trigger hemoptysis, particularly in bronchiectasis. - While an infection might be an underlying cause, antibiotics alone will not stop **massive hemoptysis** acutely and are secondary to airway management and hemorrhage control [1].

Q: A 55-year-old male presents with chronic cough and dyspnea. He has a 40-pack-year smoking history. His chest CT shows emphysematous changes. What is the most appropriate pharmacologic management?

Long-acting beta-agonists. ***Long-acting beta-agonists*** - **Long-acting beta-agonists (LABAs)** are a cornerstone of COPD management, providing sustained bronchodilation to improve airflow and reduce symptoms like dyspnea and cough in patients with **emphysema and a smoking history**. [1] - They are recommended for regular use to improve lung function, reduce exacerbation frequency, and enhance quality of life in patients with **stable COPD**. [1] *Inhaled corticosteroids* - **Inhaled corticosteroids (ICS)** are generally reserved for patients with severe COPD (FEV1 < 50% predicted) and a history of frequent exacerbations, especially if they have features of asthma-COPD overlap or high eosinophil counts, which are not specified here. - While they can reduce exacerbations, their long-term monotherapy in COPD is discouraged due to potential side effects like pneumonia, and they are typically added to bronchodilators, not used as first-line monotherapy. *IV antibiotics* - **Intravenous antibiotics** are indicated for acute bacterial exacerbations of COPD, especially in severe cases or hospitalizations, to target bacterial infections. - There is no mention of an acute exacerbation, fever, increased purulent sputum, or other signs of infection that would warrant immediate antibiotic therapy in this chronic presentation. *Short-acting beta-agonists* - **Short-acting beta-agonists (SABAs)** like albuterol provide quick relief of bronchodilation but have a short duration of action, making them suitable as **rescue medications** for acute symptom relief. [1] - They are not appropriate for chronic, daily management as first-line monotherapy in stable COPD due to their limited duration of effect and high frequency of use required, which contrasts with the need for sustained symptom control. [1]

Q: Which of the following is the most common cause of hemoptysis in developed countries?

Bronchitis. ### Bronchitis - **Acute and chronic bronchitis** are the **most common causes of hemoptysis** in developed countries due to inflammation and irritation of the bronchial mucosa, leading to coughing and rupture of superficial blood vessels [3]. - The hemoptysis is typically **mild to moderate**, often described as blood-streaked sputum. *Pulmonary embolism* - While pulmonary embolism can cause hemoptysis, it is usually associated with **pulmonary infarction** and is **less common** than bronchitis as a cause of hemoptysis [1]. - Patients typically present with sudden onset **dyspnea**, **pleuritic chest pain**, and sometimes **tachycardia** or **hypoxia** [1]. *Lung cancer* - **Lung cancer** is a significant cause of hemoptysis, especially in **smokers** over 40 years old, but it is **not the most common cause overall** [2]. - Hemoptysis due to lung cancer can range from **streaky sputum to massive hemorrhage**, often accompanied by weight loss, persistent cough, and dyspnea [3]. *Tuberculosis* - **Tuberculosis** is a prominent cause of hemoptysis, particularly in **endemic regions** and among specific risk groups (e.g., immunocompromised individuals). - While important globally, it is **less common as the primary cause** in developed countries compared to bronchitis, and typically presents with chronic cough, fever, night sweats, and weight loss.

Q: A 60-year-old male presents with sudden onset of pleuritic chest pain and dyspnea. Chest X-ray shows a wedge-shaped opacity in the lung. What is the most likely diagnosis?

Pulmonary embolism. ***Pulmonary embolism*** - The sudden onset of **pleuritic chest pain** and **dyspnea** in a 60-year-old closely aligns with a pulmonary embolism. - A **wedge-shaped opacity** on chest X-ray, known as a **Hampton's hump**, is a classic but rare finding in pulmonary embolism, representing an area of pulmonary infarction. *Pneumonia* - While pneumonia can cause **pleuritic chest pain** and **dyspnea**, its onset is usually more gradual, and it's frequently accompanied by fever, cough with sputum, and signs of infection. - Chest X-rays in pneumonia typically show **lobar consolidation** or infiltrates rather than a distinct wedge-shaped opacity. *Lung cancer* - Lung cancer usually presents with **chronic symptoms** such as persistent cough, weight loss, and hemoptysis, developing over months to years. - While a mass or nodule could appear on X-ray, a **sudden onset** of severe pleuritic pain is not typical, nor is a distinct wedge-shaped opacity. *Pneumothorax* - A pneumothorax presents with **sudden pleuritic chest pain** and **dyspnea**, similar to a pulmonary embolism. - However, a chest X-ray would show the **absence of lung markings** in the affected area and a **collapsed lung**, not a wedge-shaped opacity.

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

Acute bronchitis. ***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.

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

Pulmonary hypertension leading to right-sided heart failure. 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 1

Which test is most useful for initial evaluation of suspected pulmonary sarcoidosis?

Accepted Answer

Bronchoalveolar lavage (BAL)

Answer

Cutaneous skin biopsy

Answer

Serum angiotensin-converting enzyme (ACE) levels

Answer

Chest radiograph (X-ray)

Question 2

Which is the most common complication of deep vein thrombosis (DVT)?

Accepted Answer

Pulmonary embolism

Answer

Myocardial infarction (MI)

Answer

Cerebrovascular accident (CVA)

Answer

Renal failure

Question 3

Which test is most sensitive for screening/detecting pulmonary involvement in sarcoidosis?

Accepted Answer

Chest X-ray

Answer

Bronchoalveolar lavage

Answer

Serum ACE levels

Answer

Skin biopsy

Question 4

A 50-year-old male presents with cyanosis and is diagnosed with chronic obstructive pulmonary disease (COPD). What is the primary mechanism causing his cyanosis?

Accepted Answer

Chronic hypoxemia

Answer

Low cardiac output

Answer

Carbon monoxide poisoning

Answer

Right-to-left shunt

Question 5

A 55-year-old male with a history of bronchiectasis presents with acute onset of massive hemoptysis. What is the most appropriate immediate intervention?

Accepted Answer

Bronchoscopy

Answer

Thoracotomy

Answer

Intravenous corticosteroids

Answer

Antibiotics

Question 6

A 55-year-old male presents with chronic cough and dyspnea. He has a 40-pack-year smoking history. His chest CT shows emphysematous changes. What is the most appropriate pharmacologic management?

Accepted Answer

Long-acting beta-agonists

Answer

Inhaled corticosteroids

Answer

IV antibiotics

Answer

Short-acting beta-agonists

Question 7

Which of the following is the most common cause of hemoptysis in developed countries?

Accepted Answer

Bronchitis

Answer

Pulmonary embolism

Answer

Lung cancer

Answer

Tuberculosis

Question 8

A 60-year-old male presents with sudden onset of pleuritic chest pain and dyspnea. Chest X-ray shows a wedge-shaped opacity in the lung. What is the most likely diagnosis?

Accepted Answer

Pulmonary embolism

Answer

Pneumonia

Answer

Lung cancer

Answer

Pneumothorax

Question 9

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

Accepted Answer

Acute bronchitis

Answer

ACE inhibitors

Answer

GERD

Answer

Chronic bronchitis

Question 10

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

Accepted Answer

Pulmonary hypertension leading to right-sided heart failure

Answer

Decreased hemoglobin concentration

Answer

Increased arterial oxygen saturation

Answer

Venous stasis

Pulmonology — MCQs

Pulmonology — MCQs

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