Pulmonology Practice Questions

Q: pH 7.24, PaO2 55 mm Hg, PaCO2 55 mm Hg, and HCO3- 30 mEq/L are consistent with which acid-base disorder?

Respiratory acidosis. ***Respiratory acidosis*** - The **low pH (7.24)** indicates acidosis [1]. The **elevated PaCO2 (55 mm Hg)**, which is an acid, is primarily responsible for this drop in pH, indicating a respiratory problem [1]. - The **elevated HCO3- (30 mEq/L)** suggests a **renal compensatory response** to chronic respiratory acidosis, attempting to buffer the excess acid [2]. *Metabolic acidosis* - This would be characterized by a **low pH** and a **low bicarbonate (HCO3-)** level, which is not seen here as HCO3- is elevated [1]. - While there is acidosis, the primary driver is the elevated PaCO2, not a fall in bicarbonate. *Metabolic alkalosis* - This condition would present with a **high pH** and an elevated bicarbonate (HCO3-) level [3]. The given pH is low, indicating acidosis. - The elevated bicarbonate alone is often a **compensatory mechanism** rather than the primary disorder [3]. *Respiratory alkalosis* - This would involve a **high pH** and a **low PaCO2**, indicating hyperventilation [1]. The given pH is low, and PaCO2 is elevated. - This patient is hypoventilating, leading to CO2 retention and acidosis, not alkalosis [1].

Q: A 65-year-old male presents to the emergency department with acute respiratory distress, decreased breath sounds, and stony dullness to percussion on the right side. What is the initial management for this patient?

Thoracentesis of the right chest cavity. ***Thoracentesis of the right chest cavity*** - This patient presents with **acute respiratory distress**, **decreased breath sounds**, and **stony dullness to percussion** on the right side, which are classic signs of a **large pleural effusion**. - **Thoracentesis** (needle aspiration of pleural fluid) is the immediate intervention to relieve pressure on the lung, allow for re-expansion, and improve breathing. - This procedure provides both diagnostic information (analyzing pleural fluid) and therapeutic relief. *Pericardiocentesis* - This procedure is performed to drain fluid from the **pericardial sac** in cases of **cardiac tamponade** (Beck's triad: hypotension, muffled heart sounds, JVP elevation). - The patient's symptoms of decreased breath sounds, dullness to percussion, and unilateral findings point to a **pleural** issue, not a cardiac one. *Echocardiogram* - An **echocardiogram** is an imaging test used to visualize the heart's structure and function and assess for pericardial effusions. - While useful for diagnosis, it is **not an initial management step** to relieve acute respiratory distress caused by a pleural effusion. - In emergency settings with clear clinical signs, **therapeutic intervention takes priority** over diagnostic imaging. *Pericardial window* - A **pericardial window** is a surgical procedure to create an opening in the pericardium, typically for recurrent or loculated pericardial effusions. - This is a **definitive surgical treatment** and not an initial emergency management for acute respiratory distress from pleural pathology.

Q: Blood gas measurements of a patient show the following values: pH 7.2, pCO2 80 mm Hg, and pO2 46 mm Hg. Which of the following could be the most probable diagnosis?

Acute exacerbation of COPD. ***Acute exacerbation of COPD*** - The patient presents with **respiratory acidosis** (pH 7.2, normal 7.35-7.45) and **hypercapnia** (pCO2 80 mm Hg, normal 35-45 mm Hg), combined with severe **hypoxemia** (pO2 46 mm Hg, normal 80-100 mm Hg) [2]. - This pattern is highly indicative of an acute exacerbation of **Chronic Obstructive Pulmonary Disease**, where worsening airflow obstruction leads to inadequate alveolar ventilation and impaired gas exchange; clinical evidence suggests long-term oxygen therapy can decrease mortality in these chronic patients [1]. *Acute bronchospasm* - While acute bronchospasm can cause hypoxemia and hypercapnia, the degree of hypercapnia (pCO2 80 mm Hg) seen here is typically more severe and prolonged than commonly observed in isolated bronchospasm. Indications for assisted ventilation in severe asthma include a rising PaCO2 above 45 mmHg [3]. - Acute bronchospasm would likely result in less pronounced acidosis and more rapid response to bronchodilator therapy, which isn't described. *Pulmonary embolism* - Pulmonary embolism typically causes **hypoxemia** and **hypocapnia** (low pCO2) due to reflex hyperventilation in response to V/Q mismatch, which contradicts the presented blood gas values [2]. - The primary defect in pulmonary embolism is an obstruction of blood flow, not a global ventilation impairment leading to severe hypercapnia. *Chronic pneumonia* - Chronic pneumonia can cause **hypoxemia** due to V/Q mismatch or shunting, but it generally leads to **hypocapnia** or normal pCO2 if the patient is able to compensate by increasing ventilation [2]. - Severe hypercapnia (pCO2 80 mm Hg) with acute acidosis is less typical for uncomplicated chronic pneumonia, unless it's a very advanced or acute severe presentation with respiratory muscle fatigue.

Q: Which of the following structures is not seen on bronchoscopy?

Subcarinal lymph nodes. ***Subcarinal lymph nodes*** - While the **carina** (the division of the trachea into the main stem bronchi) is clearly visible, the **lymph nodes** located beneath it are external to the airway and cannot be directly visualized during a standard bronchoscopy. - Visualization of lymph nodes typically requires imaging studies like CT scans or invasive procedures like **endobronchial ultrasound (EBUS)** with biopsy. *Trachea* - The **trachea** is the main airway tube and is fully visualized during the initial insertion and advancement of the bronchoscope. - Its rings, mucosa, and antegrade lumen are clearly inspected. *Vocal cords* - The **vocal cords** are located in the larynx, superior to the trachea, and are the first structures encountered and assessed during the intubation phase of a bronchoscopy. - Their movement and appearance are routinely checked to ensure proper bronchoscope insertion. *First segmental division of bronchi* - Bronchoscopy allows for the visualization of the **main bronchi** and their subsequent divisions down to the **segmental and subsegmental bronchi**. - The first division branches are readily accessible and are a common area for inspection and biopsy.

Q: Pulmonary embolism is seen in all except?

Fanconi anemia. ***Fanconi anemia*** - **Fanconi anemia** is a genetic disorder characterized by **bone marrow failure**, physical abnormalities, and an increased risk of cancer. - It does **not typically involve an increased risk of pulmonary embolism** as a primary manifestation; instead, its complications relate to cytopenias and malignancy. *Paroxysmal nocturnal hemoglobinuria* - **Paroxysmal nocturnal hemoglobinuria (PNH)** is strongly associated with **thrombosis**, including pulmonary embolism, due to acquired defects in the PIGA gene leading to complement-mediated red blood cell lysis. - The loss of **GPI-anchored proteins** (CD55 and CD59) on blood cells makes them susceptible to complement attack, promoting a prothrombotic state. *Oral contraception* - **Oral contraceptives**, particularly those containing **estrogen**, significantly increase the risk of venous thromboembolism, including pulmonary embolism. - Estrogens increase the synthesis of **clotting factors** and decrease natural anticoagulants. *Old age* - **Advanced age** is a well-established risk factor for **venous thromboembolism (VTE)**, including pulmonary embolism. - This is due to age-related changes such as reduced mobility, increased prevalence of comorbidities, and altered coagulation profiles.

Q: All are causes of pulmonary hypertension except which of the following?

Hyperventilation. ***Hyperventilation*** - **Hyperventilation** leads to a decrease in arterial carbon dioxide (PaCO2), causing **respiratory alkalosis** [1]. - This alkalosis induces **pulmonary vasodilation**, which tends to decrease rather than increase pulmonary arterial pressure. *Morbid obesity* - **Morbid obesity** often leads to **obesity hypoventilation syndrome (OHS)**, characterized by chronic hypoxemia and hypercapnia. - The resulting **chronic hypoxemia** causes sustained pulmonary vasoconstriction, leading to pulmonary hypertension. *High altitude* - Living at **high altitude** exposes individuals to **chronic hypoxia** due to lower atmospheric partial pressure of oxygen [3]. - This triggers **hypoxic pulmonary vasoconstriction** as a physiological response, which over time can remodel the pulmonary vasculature and lead to pulmonary hypertension [2]. *Fenfluramine* - **Fenfluramine** is an appetite suppressant that was historically linked to the development of pulmonary hypertension. - It causes an increase in pulmonary vascular resistance through various mechanisms, including enhancing the release and inhibiting the reuptake of **serotonin**, a potent pulmonary vasoconstrictor.

Q: Which of the following is the most significant risk factor for pulmonary embolism?

Malignancy. **Malignancy** - **Malignancy** significantly increases the risk of pulmonary embolism due to a hypercoagulable state often induced by tumor cells producing procoagulant factors and inflammatory cytokines. [1] - Cancer patients are at a 4-7 times higher risk of venous thromboembolism (VTE) compared to the general population, making it a leading cause of death in this group. [1] *Protein S deficiency* - **Protein S deficiency** is a genetic **thrombophilia** that increases the risk of clotting, but it is less common and, on its own, generally carries a lower overall population attributable risk for PE than malignancy. - While it predisposes to recurrent VTE, it does not represent the most significant risk factor in the general context of PE etiologies. *Obesity* - **Obesity** is a risk factor for pulmonary embolism, as it is associated with chronic inflammation, endothelial dysfunction, and impaired fibrinolysis, all of which promote a prothrombotic state. - However, the increased risk associated with obesity is generally moderate compared to the profound prothrombotic effects of malignancy. *Progesterone therapy* - **Progesterone therapy**, particularly in the context of oral contraceptives or hormone replacement therapy, can increase the risk of VTE, including PE. - This effect is primarily due to changes in clotting factors, but the overall risk increase is typically less pronounced compared to the highly procoagulant state associated with active cancer.

Q: Which condition is associated with the development of a bovine cough?

Tracheitis. ***Tracheitis*** - **Tracheitis** involves inflammation of the trachea, which can lead to a characteristic **bovine cough** due to irritation and narrowing of the airway [3]. - The cough is often **deep, harsh**, and **nonproductive**, resembling the sound made by a cow [2]. *Acute epiglotitis* - Acute epiglottitis typically presents with a **muffled voice**, **stridor**, and **difficulty swallowing**, not a bovine cough [2]. - It is an emergent condition due to potential **airway obstruction** at the level of the epiglottis. *Laryngeal adenoidectomy* - Laryngeal adenoidectomy is not a recognized medical procedure; adenoids are located in the **nasopharynx**. - A laryngeal procedure would affect the voice but is not associated with a **bovine cough** [1]. *Antibiotics* - Antibiotics are a **treatment** for bacterial infections, not a condition that causes a bovine cough. - They are used to address the underlying bacterial cause of conditions like **bacterial tracheitis**.

Q: Superior sulcus tumor of the lungs characteristically presents with:

Pancoast syndrome. ***Pancoast syndrome*** - A **superior sulcus tumor**, specifically a Pancoast tumor, is defined by its characteristic presentation as **Pancoast syndrome**. - This syndrome includes a constellation of symptoms resulting from the tumor's invasion of surrounding structures, such as the **brachial plexus**, **cervical sympathetic chain**, and **vertebral bodies**. *Horner's syndrome* - **Horner's syndrome** is a *component* of Pancoast syndrome, caused by the tumor's invasion of the **cervical sympathetic chain**. - While it's a key feature, it doesn't encompass the entire clinical presentation of a superior sulcus tumor, which also includes shoulder and arm pain due to brachial plexus involvement. *Breathlessness* - **Shortness of breath** is a general symptom of many lung conditions, including central lung tumors [1], but it is **not characteristic** of a superior sulcus tumor's typical presentation. - Superior sulcus tumors are located peripherally at the lung apex and often present with local invasive symptoms rather than respiratory distress unless very advanced [2]. *Hemoptysis* - **Hemoptysis** (coughing up blood) is more commonly associated with tumors invading central airways or large vessels [1], but it is **not a characteristic initial presentation** of a superior sulcus tumor. - The location of a superior sulcus tumor in the lung apex makes bleeding into the airways less likely as a primary symptom.

Q: In acute pulmonary embolism, which among the following is the most frequent ECG finding?

Sinus tachycardia. ***Sinus tachycardia*** - **Sinus tachycardia** is the most frequent ECG finding in acute pulmonary embolism, seen in up to 40% of cases [1]. - It reflects the body's compensatory response to hypoxemia and decreased cardiac output. *S1Q3T3 pattern* - The classic **S1Q3T3 pattern** (S wave in lead I, Q wave in lead III, inverted T wave in lead III) is specific for acute right heart strain but is only found in approximately 10-20% of cases [1]. - It indicates more significant right ventricular dysfunction and is not the most frequent finding. *P. pulmonale* - **P. pulmonale**, characterized by tall, peaked P waves in leads II, III, and aVF, suggests **right atrial enlargement** due to chronic lung disease or pulmonary hypertension [1]. - While it can be seen in severe, prolonged right heart strain, it is much less common in acute PE than sinus tachycardia. *Right axis deviation* - **Right axis deviation** indicates **right ventricular hypertrophy** or acute right heart strain. - Like the S1Q3T3 pattern, it is a sign of more significant right heart involvement and is not as common as sinus tachycardia in all cases of acute PE [1].

Question 1

pH 7.24, PaO2 55 mm Hg, PaCO2 55 mm Hg, and HCO3- 30 mEq/L are consistent with which acid-base disorder?

Accepted Answer

Respiratory acidosis

Answer

Metabolic acidosis

Answer

Metabolic alkalosis

Answer

Respiratory alkalosis

Question 2

A 65-year-old male presents to the emergency department with acute respiratory distress, decreased breath sounds, and stony dullness to percussion on the right side. What is the initial management for this patient?

Accepted Answer

Thoracentesis of the right chest cavity

Answer

Echocardiogram

Answer

Pericardial window

Answer

Pericardiocentesis

Question 3

Blood gas measurements of a patient show the following values: pH 7.2, pCO2 80 mm Hg, and pO2 46 mm Hg. Which of the following could be the most probable diagnosis?

Accepted Answer

Acute exacerbation of COPD

Answer

Acute bronchospasm

Answer

Pulmonary embolism

Answer

Chronic pneumonia

Question 4

Which of the following structures is not seen on bronchoscopy?

Accepted Answer

Subcarinal lymph nodes

Answer

Trachea

Answer

Vocal cords

Answer

First segmental division of bronchi

Question 5

Pulmonary embolism is seen in all except?

Accepted Answer

Fanconi anemia

Answer

Oral contraception

Answer

Old age

Answer

Paroxysmal nocturnal hemoglobinuria

Question 6

All are causes of pulmonary hypertension except which of the following?

Accepted Answer

Hyperventilation

Answer

High altitude

Answer

Fenfluramine

Answer

Morbid obesity

Question 7

Which of the following is the most significant risk factor for pulmonary embolism?

Accepted Answer

Malignancy

Answer

Protein S deficiency

Answer

Obesity

Answer

Progesterone therapy

Question 8

Which condition is associated with the development of a bovine cough?

Accepted Answer

Tracheitis

Answer

Laryngeal adenoidectomy

Answer

Acute epiglotitis

Answer

Antibiotics

Question 9

Superior sulcus tumor of the lungs characteristically presents with:

Accepted Answer

Pancoast syndrome

Answer

Breathlessness

Answer

Hemoptysis

Answer

Horner's syndrome

Question 10

In acute pulmonary embolism, which among the following is the most frequent ECG finding?

Accepted Answer

Sinus tachycardia

Answer

Right axis deviation

Answer

S1Q3T3 pattern

Answer

P. pulmonale

Pulmonology — MCQs

Pulmonology — MCQs

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