Pulmonology Practice Questions

Q: Which of the following best describes the arterial blood gas findings in type II respiratory failure?

Low pO2 and high pCO2. ***Low pO2 and high pCO2*** - Type II respiratory failure is characterized by **hypoxemia** (low pO2) and **hypercapnia** (high pCO2), indicating a failure of both oxygenation and ventilation [1]. - This condition arises when the respiratory system cannot adequately remove carbon dioxide, leading to its accumulation in the blood [2]. *Low pO2 and low pCO2* - This pattern would typically suggest **compensated metabolic acidosis** or a response to profound hypoxemia with hyperventilation, not primary respiratory failure. - While there is hypoxemia, the low pCO2 indicates efficient or excessive CO2 removal, which is contrary to the definition of type II respiratory failure. *Normal pO2 and high pCO2* - A normal pO2 with high pCO2 is unlikely in true respiratory failure, as **hypoxemia** is a defining feature of any respiratory failure type [1]. - Isolated hypercapnia without hypoxemia would suggest a unique form of ventilation-perfusion mismatch that is not characteristic of respiratory failure. *Low pO2 and normal pCO2* - This description aligns with **Type I respiratory failure**, which is characterized by **hypoxemia** without significant hypercapnia or with normal pCO2 [1]. - In Type I, the primary issue is impaired oxygenation, while CO2 removal (ventilation) might still be adequate [1].

Q: Which of the following conditions is least likely to cause pneumothorax?

Bronchopulmonary Aspergillosis. ***Bronchopulmonary Aspergillosis*** - Allergic bronchopulmonary aspergillosis (ABPA) is a hypersensitivity reaction to *Aspergillus* species, primarily causing **bronchospasm**, **mucus plugging**, and **bronchiectasis**, rarely leading to pneumothorax [1]. - While it can cause significant lung damage, **pneumothorax** is not a characteristic or common complication, unlike the other conditions listed. *Marfan syndrome* - Patients with **Marfan syndrome** have connective tissue abnormalities, including those affecting the pleura and lung parenchyma. - This predisposition can lead to the formation of **apical blebs and bullae**, which are prone to rupture and cause **spontaneous pneumothorax** [2]. *Assisted ventilation* - **Positive pressure ventilation**, especially with high pressures or volumes, can cause barotrauma or volutrauma to the lungs [2]. - This can lead to alveolar rupture, resulting in **pneumothorax**, particularly in patients with pre-existing lung disease or those requiring high ventilatory support. *Eosinophilic granuloma* - Also known as **pulmonary Langerhans cell histiocytosis**, this condition involves the infiltration of the lungs by Langerhans cells. - It often leads to the formation of **cysts and nodules**, which can rupture and cause recurrent **spontaneous pneumothorax**.

Q: The most common cause of lung abscess is:

Aspiration. **Aspiration** - **Aspiration of oropharyngeal secretions** containing anaerobic bacteria is the most common mechanism leading to lung abscess formation. [1] - This often occurs in individuals with **impaired consciousness** (e.g., due to alcohol intoxication, stroke, seizures), dysphagia, or poor dental hygiene. [1] *Hematogenous spread from distant site* - While possible, **hematogenous spread** (e.g., from endocarditis or septic thrombophlebitis) is a less common cause of lung abscess compared to aspiration. - This typically results in **multiple, diffuse abscesses**, rather than a single, large one. *Direct contact* - **Direct contact** or extension from an adjacent infection (e.g., empyema) can cause lung involvement, but it is not the most frequent etiology of primary lung abscess. - This refers to the spread from a contiguous thoracic infection invading the lung parenchyma. *Lymphatic spread* - **Lymphatic spread** is a rare cause of lung abscess and is more typically associated with the dissemination of malignancy or certain fungal infections rather than bacterial abscess formation. - The lymphatic system primarily drains fluid and immune cells, not typically leading to focal pus collections.

Q: A 40-year-old man presented with repeated episodes of bronchospasm and hemoptysis. Chest X-ray revealed perihilar bronchiectasis. The most likely diagnosis is

Bronchopulmonary aspergillosis. ***Bronchopulmonary aspergillosis*** - **Allergic bronchopulmonary aspergillosis (ABPA)** is characterized by **bronchospasm**, recurrent fleeting pulmonary infiltrates, and **hemoptysis** in patients with asthma or cystic fibrosis. - The chest X-ray findings of **perihilar bronchiectasis** are a hallmark of ABPA, resulting from airway damage caused by the allergic response to *Aspergillus fumigatus*. *Sarcoidosis* - Sarcoidosis is a **granulomatous disease** that typically presents with non-caseating granulomas, often affecting the lungs, lymph nodes, eyes, and skin. [1] - While it can cause respiratory symptoms, **bronchiectasis** and **hemoptysis** are not typical primary features; more common findings include bilateral hilar lymphadenopathy and interstitial lung disease. [1] *Idiopathic pulmonary fibrosis* - Idiopathic pulmonary fibrosis (IPF) is a **chronic, progressive interstitial lung disease** characterized by progressive scarring of the lung tissue. [2] - While IPF causes respiratory symptoms like dyspnea and cough, it does not typically present with recurrent **bronchospasm**, **hemoptysis**, or **perihilar bronchiectasis**. [2] *Extrinsic allergic alveolitis* - Extrinsic allergic alveolitis, also known as **hypersensitivity pneumonitis**, is an immune-mediated lung disease caused by exposure to various inhaled antigens. - It typically presents with flu-like symptoms, cough, and dyspnea, and while it can cause interstitial lung disease, **bronchospasm** and **bronchiectasis** are not characteristic features.

Q: Which of the following is NOT a characteristic feature of sarcoidosis?

Erythema marginatum. ***Erythema marginatum*** - This is a hallmark feature of **acute rheumatic fever**, characterized by a pink-red rash with raised borders and central clearing. - It is **not associated with sarcoidosis**, a multi-system granulomatous disease [1]. *Panda sign* - The **"Panda sign"** refers to increased uptake in the lacrimal and parotid glands on a gallium scan, a finding consistent with sarcoidosis. - This sign indicates **lymphocytic infiltration** of these glands, a common manifestation of the disease. *Egg shell calcification* - **Eggshell calcification** can be seen in the hilar or mediastinal lymph nodes in sarcoidosis, though it is more classically associated with **silicosis** [2]. - It represents calcification occurring in the periphery of a lymph node. *Hilar lymphadenopathy* - **Bilateral hilar lymphadenopathy** is the most common radiological finding in sarcoidosis, present in up to 90% of cases [1]. - It is often asymptomatic and detected on a routine chest X-ray [1].

Q: Which statement is true regarding pneumothorax?

Absent breath sounds. ***Absent breath sounds*** * **Complete absence of breath sounds** on the affected side is a hallmark sign of a pneumothorax, indicating collapsed lung tissue and air in the pleural space. * Air in the pleural space attenuates sound transmission, leading to a significant reduction or **absence of vesicular breath sounds** [2]. *Decreased percussion note* * A pneumothorax typically leads to a **hyperresonant percussion note** due to the presence of air in the pleural space. * A decreased or dull percussion note is usually associated with conditions like **pleural effusion** or consolidation [3]. *Always needs chest tube insertion* * **Small, stable pneumothoraces** can often be managed with observation and oxygen, especially if the patient is asymptomatic. * Chest tube insertion is reserved for **larger pneumothoraces**, symptomatic patients, or those with tension pneumothorax [1]. *Tracheal tug* * **Tracheal deviation**, not tracheal tug, can be a sign of a **tension pneumothorax**, where the trachea is pushed away from the affected side [1]. * Tracheal tug, or upward movement of the trachea with inspiration, is more indicative of **severe airway obstruction** or respiratory distress.

Q: Which of the following is NOT a contributing factor to pulmonary hypertension in COPD?

Bronchoconstriction. ***Bronchoconstriction*** - While common in COPD, **bronchoconstriction primarily increases airway resistance** and affects airflow, not directly pulmonary vascular pressure. - It does not directly cause the **remodeling** or **vasoconstriction** of pulmonary arteries that leads to sustained pulmonary hypertension. *Hypoxia* - **Chronic alveolar hypoxia** in COPD is a major driver of pulmonary hypertension by causing **pulmonary vasoconstriction**. - It also contributes to vascular remodeling, leading to sustained increases in pulmonary vascular resistance. *Pulmonary vasoconstriction* - **Hypoxia-induced pulmonary vasoconstriction** [1] is a primary and immediate response in the lungs that leads to increased pulmonary arterial pressure. - Over time, chronic vasoconstriction contributes to **vascular remodeling**, further exacerbating pulmonary hypertension. *High lung volume* - The **hyperinflation** characteristic of COPD can compress pulmonary capillaries and small vessels [2], leading to increased pulmonary vascular resistance. - This extrinsic compression contributes mechanically to the elevated pulmonary pressures seen in these patients.

Q: Pulmonary embolism is most commonly caused by:

Deep vein thrombosis (DVT) of the leg. ***Deep vein thrombosis (DVT) of the leg*** - **Deep vein thrombosis (DVT)** in the leg is the most common source of emboli that travel to the lungs, leading to pulmonary embolism [1]. - The thrombus breaks off from the deep veins, typically in the **lower extremities**, and propagates through the venous system to the pulmonary arteries [1]. *Increased pulmonary pressure (a consequence of PE)* - **Increased pulmonary pressure** is a physiological consequence of a significant pulmonary embolism, as blood flow is obstructed, but it is not the cause of the embolism itself. - This option describes a **downstream effect**, rather than the origin of the embolus. *Fat embolism from pelvic fracture* - **Fat embolisms** can occur after long bone fractures (especially pelvic or femur fractures) and surgeries, but they are a less common cause of PE compared to DVT. - While they can lead to pulmonary symptoms, the mechanism involves **fat globules** entering the circulation, distinct from a thrombus. *Cardiac emboli from heart disease* - **Cardiac emboli** typically originate from the heart (e.g., from atrial fibrillation, mural thrombi after myocardial infarction, or valvular disease) and usually cause **systemic emboli** leading to strokes or limb ischemia. - While rare, paradoxal emboli can occur via a patent foramen ovale but are not the leading cause of "pulmonary" embolism.

Q: Which of the following statements about pulmonary embolism is false?

Most commonly presents within 2 weeks. Most commonly presents within 2 weeks - This statement is **false** because while pulmonary embolism can occur at any time, its onset is not restricted to or "most commonly presents" within a two-week period. - The timing of presentation can vary widely depending on the predisposing factors and the specific event leading to the embolus formation and migration. *Dyspnea is the most common symptom* - **Dyspnea** (shortness of breath) is indeed the **most frequent symptom** reported by patients experiencing pulmonary embolism. - This symptom often occurs acutely and can range from mild to severe, correlating with the size and location of the embolism. *Pulmonary embolism often arises from deep vein thrombosis in the legs.* - The vast majority of **pulmonary emboli (PEs)** originate from **deep vein thromboses (DVTs)**, particularly those located in the large veins of the legs and pelvis [1, 2]. - These clots can detach and travel through the venous system to the heart and then into the pulmonary arteries [2]. *Longer survival time generally indicates a better chance of recovery.* - Patients who survive longer after a pulmonary embolism are more likely to have received timely treatment and may have experienced a less severe embolic event or have better underlying health. - Prolonged survival after the initial acute phase suggests the patient has overcome the immediate life-threatening aspects and is on the path to recovery, potentially with less long-term sequelae.

Q: Hamman's sign is seen in:

Pneumomediastinum. ***Pneumomediastinum*** - **Hamman's sign** is a classic auscultatory finding in pneumomediastinum, characterized by **crunching, bubbling, or clicking sounds synchronized with the heartbeat**. - These sounds are heard due to the presence of **air in the mediastinum** being displaced by the contracting heart. *Pericardial effusion* - **Pericardial effusion** involves fluid accumulation around the heart, which typically causes muffled heart sounds and, in severe cases, signs of **cardiac tamponade**. - It does not produce the characteristic **crunching sound** associated with Hamman's sign. *Superior vena cava obstruction* - **Superior vena cava obstruction** is characterized by symptoms like **facial swelling**, **distended neck veins**, and dyspnea due to impaired venous return. - It does not lead to the presence of air in the mediastinum or the specific auscultatory findings of Hamman's sign. *Thyrotoxicosis* - **Thyrotoxicosis** is a hypermetabolic state with symptoms such as **tachycardia**, palpitations, and heat intolerance. - While it affects the cardiovascular system, it does not involve the presence of air in the mediastinum or the development of Hamman's sign.

Question 1

Which of the following best describes the arterial blood gas findings in type II respiratory failure?

Accepted Answer

Low pO2 and high pCO2

Answer

Low pO2 and low pCO2

Answer

Normal pO2 and high pCO2

Answer

Low pO2 and normal pCO2

Question 2

Which of the following conditions is least likely to cause pneumothorax?

Accepted Answer

Bronchopulmonary Aspergillosis

Answer

Marfan syndrome

Answer

Assisted ventilation

Answer

Eosinophilic granuloma

Question 3

The most common cause of lung abscess is:

Accepted Answer

Aspiration

Answer

Lymphatic spread

Answer

Hematogenous spread from distant site

Answer

Direct contact

Question 4

A 40-year-old man presented with repeated episodes of bronchospasm and hemoptysis. Chest X-ray revealed perihilar bronchiectasis. The most likely diagnosis is

Accepted Answer

Bronchopulmonary aspergillosis

Answer

Sarcoidosis

Answer

Idiopathic pulmonary fibrosis

Answer

Extrinsic allergic alveolitis

Question 5

Which of the following is NOT a characteristic feature of sarcoidosis?

Accepted Answer

Erythema marginatum

Answer

Panda sign

Answer

Egg shell calcification

Answer

Hilar lymphadenopathy

Question 6

Which statement is true regarding pneumothorax?

Accepted Answer

Absent breath sounds

Answer

Decreased percussion note

Answer

Tracheal tug

Answer

Always needs chest tube insertion

Question 7

Which of the following is NOT a contributing factor to pulmonary hypertension in COPD?

Accepted Answer

Bronchoconstriction

Answer

High lung volume

Answer

Hypoxia

Answer

Pulmonary vasoconstriction

Question 8

Pulmonary embolism is most commonly caused by:

Accepted Answer

Deep vein thrombosis (DVT) of the leg

Answer

Fat embolism from pelvic fracture

Answer

Cardiac emboli from heart disease

Answer

Increased pulmonary pressure (a consequence of PE)

Question 9

Which of the following statements about pulmonary embolism is false?

Accepted Answer

Most commonly presents within 2 weeks

Answer

Pulmonary embolism often arises from deep vein thrombosis in the legs.

Answer

Dyspnea is the most common symptom

Answer

Longer survival time generally indicates a better chance of recovery.

Question 10

Hamman's sign is seen in:

Accepted Answer

Pneumomediastinum

Answer

Pericardial effusion

Answer

Superior vena cava obstruction

Answer

Thyrotoxicosis

Pulmonology — MCQs

Pulmonology — MCQs

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