Pulmonology Practice Questions

Q: A patient is a known case of acute pancreatitis who develops breathlessness and bilateral basal crepitations on day 4. Oxygen saturation is 84% on room air, and arterial blood gas shows PaO2/FiO2 ratio of 180 mmHg measured on PEEP of 5 cm H2O. Chest X-ray reveals new bilateral opacities not fully explained by collapse or effusions. There is no clinical evidence of cardiac failure or fluid overload to account for the findings. What is the most likely diagnosis?

Acute Respiratory Distress Syndrome (ARDS). ***Acute Respiratory Distress Syndrome (ARDS)*** - Patients with **acute pancreatitis** are at high risk for developing **systemic inflammatory response syndrome (SIRS)**, which can progress to ARDS, characterized by **bilateral pulmonary infiltrates** and severe hypoxemia. - The onset of **breathlessness** and **bilateral basal crepitations** on day 4 in a patient with acute pancreatitis strongly suggests ARDS, indicating severe lung injury and inflammation. *Pulmonary embolism (PE)* - While PE can cause breathlessness, **bilateral basal crepitations** are not a typical primary finding; PE often presents with pleuritic chest pain and localized lung signs. - PE is usually a later complication, and while possible, ARDS is a more common and direct complication of severe acute pancreatitis. *Lung collapse (atelectasis)* - **Atelectasis** can cause breathlessness and localized crackles, but it typically presents as **unilateral** or segmental collapse rather than diffuse bilateral basal crepitations. - While mild atelectasis is common in critically ill patients, it alone would not usually account for the severe respiratory compromise implied by the scenario in the context of acute pancreatitis. *Bilateral pneumonia* - **Bilateral pneumonia** can cause breathlessness and crepitations, but it typically involves fever, purulent sputum, and signs of infection, which are not explicitly mentioned as the primary cause here. - While a possibility, in acute pancreatitis, the systemic inflammatory response is more likely to lead to **non-cardiogenic pulmonary edema** characteristic of ARDS, rather than an immediate primary bacterial pneumonia.

Q: A patient presents with symptoms of wheezing, shortness of breath, and a history of asthma. Which of the following conditions does this most likely signify?

Obstructive lung disease. ***Obstructive lung disease*** - **Wheezing** and **shortness of breath** in a patient with a **history of asthma** are classic signs of airway narrowing, which is characteristic of obstructive lung diseases [1]. - **Asthma** is a prototypical **obstructive lung disease** where inflammation and bronchoconstriction impede airflow, especially during exhalation [2]. *Normal lung function* - This option is incorrect because the patient is experiencing **symptoms** like wheezing and shortness of breath, which indicate **impaired respiratory function**. - **Normal lung function** would involve unobstructed airflow and the absence of such respiratory distress. *Restrictive lung disease* - **Restrictive lung diseases** typically involve reduced lung volumes due to stiffness of the lungs or chest wall, leading to difficulty **inhaling**. - While shortness of breath can be present, **wheezing** is not a primary symptom and the patient's history of asthma strongly points away from a restrictive process [1]. *Both* - The combination of **wheezing** and a history of **asthma** specifically points to an **obstructive process** rather than a blend of both, as asthma's pathology is rooted in airway obstruction [1]. - While some complex lung conditions can have elements of both, the prominent features described here are characteristic of **obstructive lung disease**.

Q: In which of the following conditions is oxygen therapy generally not considered useful?

Severe laryngeal obstruction. Directly address the conditions where oxygen therapy is effective or ineffective. ***Severe laryngeal obstruction*** - In cases of **severe laryngeal obstruction**, the primary issue is a mechanical blockage preventing air from reaching the lungs, not impaired gas exchange at the alveolar level [3]. Oxygen therapy alone cannot bypass this physical obstruction. - The immediate and critical intervention for severe laryngeal obstruction is to secure an airway, often through procedures like **intubation** or **tracheostomy**, rather than relying on supplemental oxygen [4]. *Acute asthma exacerbation* - Patients with acute asthma exacerbations often experience **bronchoconstriction** and **airway inflammation**, leading to ventilation-perfusion mismatch and hypoxemia [2]. - Oxygen therapy is crucial in these patients to correct hypoxemia and reduce the work of breathing, improving tissue oxygenation [1]. *Bacterial pneumonia* - **Bacterial pneumonia** causes consolidation and inflammation in the lung parenchyma, impairing gas exchange and leading to hypoxemia [2]. - Oxygen therapy is a standard treatment to maintain adequate arterial oxygen saturation and support respiratory function in patients with pneumonia [1]. *Pulmonary fibrosis* - **Pulmonary fibrosis** involves scarring and thickening of the lung tissue, which impedes the diffusion of oxygen across the alveolar-capillary membrane. - Supplemental oxygen helps overcome this diffusion defect, particularly during exertion, improving hypoxemia and reducing dyspnea [1].

Q: Type IV respiratory failure occurs due to

Hypoperfusion of respiratory muscles. Type IV respiratory failure occurs due to ***Hypoperfusion of respiratory muscles*** - Type IV respiratory failure is specifically defined as **shock-induced respiratory failure** due to inadequate oxygen delivery to the respiratory muscles. - This leads to **respiratory muscle fatigue** and an inability to maintain adequate ventilation, causing both hypoxemia and hypercapnia. *Alveolar flooding* - This condition is characteristic of **Type I respiratory failure** [1], which is primarily hypoxemic and involves impaired oxygenation [2]. - Causes include **pulmonary edema** (cardiogenic or non-cardiogenic ARDS) where fluid fills the alveoli [3]. *Inability to eliminate CO2* - This describes **Type II respiratory failure**, also known as **hypercapnic respiratory failure**, due to inadequate alveolar ventilation [2]. - It results from conditions like **COPD exacerbation**, neuromuscular disorders, or severe airway obstruction, where the primary issue is CO2 retention [1]. *Lung atelectasis* - Leads to **Type I (hypoxemic) respiratory failure** by causing an intrapulmonary shunt, where unventilated parts of the lung are still perfused [2]. - It is the collapse of lung tissue, typically due to **airway obstruction** or compression, but does not directly cause Type IV failure.

Q: In an ICU setting, patients suffering from which respiratory pathology are at risk of CO2 narcosis?

Emphysema. ***Emphysema*** - Patients with **emphysema** often have chronic **CO2 retention** due to impaired gas exchange and reduced expiratory airflow, making them susceptible to CO2 narcosis with supplemental oxygen [4]. - Their **respiratory drive** is primarily cued by hypoxic stimulation, and increasing oxygen can suppress this drive, leading to further CO2 accumulation [1], [4]. *Pneumonia* - While pneumonia can cause respiratory distress, it typically leads to **hypoxemia** rather than hypercapnia in early stages, as ventilation-perfusion mismatch is the primary issue [3]. - Patients with pneumonia are not inherently predisposed to **CO2 narcosis** unless there is severe underlying lung disease or muscle fatigue. *Asthma* - Acute asthma exacerbations mainly cause **bronchoconstriction** and **air trapping**, leading to hypoxemia. Hypercapnia only occurs in severe, life-threatening asthma with significant respiratory muscle fatigue or impending respiratory failure [2]. - Patients with asthma are generally not at chronic risk of **CO2 narcosis** unless in an acute, severe episode and over-oxygenated. *Bronchiectasis* - Bronchiectasis involves **permanent dilation of bronchi** due to chronic infection and inflammation, leading to impaired mucociliary clearance and recurrent infections. - While it can cause chronic respiratory symptoms and hypoxemia, it typically does not directly lead to **CO2 retention** to the extent seen in advanced COPD, unless there is significant co-existing lung parenchymal damage.

Q: Brock's syndrome is associated with which lobe of the lung?

Middle lobe of the right lung. ***Middle lobe of the right lung*** - **Brock's syndrome** specifically refers to chronic or recurrent collapse/consolidation of the **right middle lobe**. [1] - It is often caused by **bronchial obstruction** due to compression from enlarged lymph nodes or recurrent infections. [2] *Lower lobe of the right lung* - While other conditions can affect the **right lower lobe**, it is not specifically associated with Brock's syndrome. - Collapse or consolidation in this lobe would typically be referred to by its anatomical location rather than this eponymous syndrome. *Upper lobe of the left lung* - Conditions affecting the **left upper lobe** have distinct etiologies and are not designated as Brock's syndrome. [3] - This lobe is frequently affected in **tuberculosis** and other specific pathologies. *Lower lobe of the left lung* - The **left lower lobe** is a common site for various pulmonary pathologies but not for Brock's syndrome. - Its involvement typically points towards different diagnostic considerations.

Q: What is the most common cause of death in a patient with chronic bronchiectasis?

Infection. ***Infection*** - Chronic bronchiectasis creates a favorable environment for **bacterial colonization** and recurrent infections due to impaired mucociliary clearance and dilated, damaged airways. [1] - These infections, often by **Pseudomonas aeruginosa** or **Haemophilus influenzae**, can lead to acute exacerbations, progressive lung damage, and ultimately **respiratory failure** or overwhelming sepsis, which are common causes of death. [1], [2] *Right-sided heart failure* - **Cor pulmonale**, or right-sided heart failure, can develop as a complication of severe bronchiectasis due to **pulmonary hypertension** from chronic hypoxemia and vascular remodeling. - While it contributes to morbidity and mortality, it is not the most common direct cause of death; the underlying lung disease and subsequent infections are usually the primary drivers. *Hemoptysis* - **Severe hemoptysis** can occur in bronchiectasis due to erosion of inflamed bronchial arteries, which can be life-threatening if massive. [2], [3] - Although it is a serious complication and can be fatal, it is not the most frequent cause of death compared to the cumulative effect of chronic infections and progressive respiratory decline. *Carcinoma* - While patients with chronic lung conditions, including bronchiectasis, may have an **increased risk of lung cancer**, it is not the most common cause of death directly attributable to bronchiectasis itself. [3] - The direct and immediate threats to life in bronchiectasis are typically related to **exacerbations, infections, and respiratory failure**.

Q: Which tool objectively assesses the risk of adverse outcomes in a patient with pneumonia?

CURB - 65 criteria. ***CURB - 65 criteria*** - The **CURB-65 criteria** is a validated tool for assessing the **severity of pneumonia** and predicting adverse outcomes such as mortality, need for intensive care, and length of hospital stay [1]. - It assesses **Confusion, Urea >7 mmol/L, Respiratory rate ≥30 breaths/min, Blood pressure <90 mmHg systolic or ≤60 mmHg diastolic**, and **age ≥65 years**, assigning points that correlate with increasing risk [1]. *Pneumonia severity index [PSI]* - The **Pneumonia Severity Index (PSI)** is another widely used tool, but it is a **more complex** - It involves 20 variables, making it more cumbersome for rapid clinical use compared to CURB-65. *APACHE Score* - The **APACHE (Acute Physiology and Chronic Health Evaluation) Score** is a general measure of disease severity used in **critically ill patients**, not specific to pneumonia. - It predicts **mortality risk** in intensive care unit (ICU) patients across various conditions. *Glasgow scale* - The **Glasgow Coma Scale (GCS)** is used to **assess the level of consciousness** in patients. - It is not a tool for specifically assessing the risk of adverse outcomes in pneumonia, but rather a component that may contribute to a pneumonia severity score.

Q: Which ECG pattern is commonly associated with pulmonary embolism?

S1Q3T3. S1Q3T3 - The S1Q3T3 pattern is a classic ECG finding in pulmonary embolism (PE), indicating acute right heart strain [1]. - It consists of a prominent S wave in lead I, a Q wave in lead III, and an inverted T wave in lead III [1]. T wave inversion in V1-V4 - While T wave inversions can occur in PE, particularly in the precordial leads, the absence of an S1Q3T3 pattern makes it a less specific indicator compared to S1Q3T3 [1]. - This finding is also common in other conditions like myocardial ischemia or right ventricular hypertrophy. S1Q1T3 - This is not a recognized or common ECG pattern associated with pulmonary embolism. - The specific combination of waves in this pattern does not reflect the typical acute right heart strain seen in PE. S3Q3T1 - This is not a recognized or common ECG pattern associated with pulmonary embolism. - The described complex of waves does not correspond to the physiological changes, such as acute right ventricular overload, that occur during a PE.

Question 1

A 35-year-old woman with a long history of dyspnea, chronic cough, sputum production, and wheezing dies of respiratory failure following a bout of lobar pneumonia. She was not a smoker or an alcoholic. She also has a history of recurrent pulmonary infections since childhood, pancreatic insufficiency, and an elevated sweat chloride test. The lung autopsy is shown in the image. Which underlying condition is most likely associated with the pathologic changes shown?

Accepted Answer

Cystic fibrosis

Answer

Alpha 1 antitrypsin deficiency

Answer

Goodpasture syndrome

Answer

Primary ciliary dyskinesia

Question 2

A patient is a known case of acute pancreatitis who develops breathlessness and bilateral basal crepitations on day 4. Oxygen saturation is 84% on room air, and arterial blood gas shows PaO2/FiO2 ratio of 180 mmHg measured on PEEP of 5 cm H2O. Chest X-ray reveals new bilateral opacities not fully explained by collapse or effusions. There is no clinical evidence of cardiac failure or fluid overload to account for the findings. What is the most likely diagnosis?

Accepted Answer

Acute Respiratory Distress Syndrome (ARDS)

Answer

Lung collapse (atelectasis)

Answer

Pulmonary embolism (PE)

Answer

Bilateral pneumonia

Question 3

A patient presents with symptoms of wheezing, shortness of breath, and a history of asthma. Which of the following conditions does this most likely signify?

Accepted Answer

Obstructive lung disease

Answer

Normal lung function

Answer

Restrictive lung disease

Answer

Both

Question 4

In which of the following conditions is oxygen therapy generally not considered useful?

Accepted Answer

Severe laryngeal obstruction

Answer

Acute asthma exacerbation

Answer

Bacterial pneumonia

Answer

Pulmonary fibrosis

Question 5

Type IV respiratory failure occurs due to

Accepted Answer

Hypoperfusion of respiratory muscles

Answer

Alveolar flooding

Answer

Inability to eliminate CO2

Answer

Lung atelectasis

Question 6

In an ICU setting, patients suffering from which respiratory pathology are at risk of CO2 narcosis?

Accepted Answer

Emphysema

Answer

Pneumonia

Answer

Asthma

Answer

Bronchiectasis

Question 7

Brock's syndrome is associated with which lobe of the lung?

Accepted Answer

Middle lobe of the right lung

Answer

Lower lobe of the right lung

Answer

Upper lobe of the left lung

Answer

Lower lobe of the left lung

Question 8

What is the most common cause of death in a patient with chronic bronchiectasis?

Accepted Answer

Infection

Answer

Hemoptysis

Answer

Carcinoma

Answer

Right-sided heart failure

Question 9

Which tool objectively assesses the risk of adverse outcomes in a patient with pneumonia?

Accepted Answer

CURB - 65 criteria

Answer

Glasgow scale

Answer

APACHE Score

Answer

Pneumonia severity index [PSI]

Question 10

Which ECG pattern is commonly associated with pulmonary embolism?

Accepted Answer

S1Q3T3

Answer

T wave inversion in V1-V4

Answer

S1Q1T3

Answer

S3Q3T1

Pulmonology — MCQs

Pulmonology — MCQs

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