Pulmonary Vascular Diseases — MCQs
Drug not used in pulmonary hypertension is:
All are causes of pulmonary hypertension except which of the following?
Which of the following is not associated with pulmonary arterial hypertension?
Pulmonary embolism is most commonly produced by which of the following?
Which of the following is the most significant risk factor for pulmonary embolism?
Best predictor of mortality in pulmonary embolism?
A 50-year-old patient presents with dyspnea, edema, and an elevated JVP. Which condition is most likely?
Pulmonary embolism is most commonly caused by:
All of the following are features of interstitial lung disease except which one?
Irreversible obstructive lung function is seen in which of the following conditions?
Pulmonary Vascular Diseases Indian Medical PG Practice Questions and MCQs
Question 1: Drug not used in pulmonary hypertension is:
- A. Endothelin receptor antagonist
- B. Prostacyclin
- C. Alpha blocker (Correct Answer)
- D. Calcium channel blocker
Explanation: ***Alpha blocker*** - Alpha-blockers primarily cause **systemic vasodilation** [1] and are not indicated for the specific pulmonary vascular remodeling and vasoconstriction seen in pulmonary hypertension. [2] - Their use could lead to an undesirable drop in **systemic blood pressure** [3] without adequately addressing the pulmonary arterial pressure. *Calcium channel blocker* - **Calcium channel blockers** (namely **dihydropyridines** like nifedipine and amlodipine) are used in a small subset of pulmonary hypertension patients who are **vasoreactive** on acute testing. - They work by relaxing pulmonary arterial smooth muscle, reducing **pulmonary vascular resistance**. *Endothelin receptor antagonist* - **Endothelin receptor antagonists** (e.g., bosentan, ambrisentan) block the effects of **endothelin-1**, a potent vasoconstrictor and smooth muscle proliferator involved in pulmonary hypertension. - They improve hemodynamics, exercise capacity, and clinical outcomes by preventing **vasoconstriction** and **vascular remodeling**. *Prostacyclin* - **Prostacyclin analogs** (e.g., epoprostenol, treprostinil) are potent **vasodilators** and inhibitors of platelet aggregation. - They are highly effective in treating severe pulmonary hypertension by relaxing pulmonary arteries and preventing **thrombosis**.
Question 2: All are causes of pulmonary hypertension except which of the following?
- A. High altitude
- B. Fenfluramine
- C. Morbid obesity
- D. Hyperventilation (Correct Answer)
Explanation: ***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.
Question 3: Which of the following is not associated with pulmonary arterial hypertension?
- A. Cor - pulmonale
- B. Left ventricular hypertrophy (Correct Answer)
- C. Mitral Stenosis
- D. Interstitial lung disease
Explanation: ***Left ventricular hypertrophy*** - **Left ventricular hypertrophy** is typically caused by conditions that increase the workload on the left ventricle, such as **systemic hypertension** or **aortic stenosis** [1]. - Pulmonary arterial hypertension directly affects the **pulmonary vasculature**, leading to increased pressure in the pulmonary circuit and ultimately right heart strain, not left ventricular hypertrophy. *Cor pulmonale* - **Cor pulmonale** is defined as **right ventricular enlargement** secondary to lung disease or pulmonary vascular disease. - Pulmonary arterial hypertension increases the afterload on the right ventricle, causing it to dilate and hypertrophy, eventually leading to **right heart failure** (cor pulmonale) [2]. *Mitral Stenosis* - **Mitral stenosis** causes an obstruction to blood flow from the left atrium to the left ventricle, leading to increased pressure in the left atrium and pulmonary veins. - This elevated pressure can be transmitted backward into the pulmonary arteries, leading to **pulmonary arterial hypertension** [3]. *Interstitial lung disease* - **Interstitial lung disease** (ILD) can lead to destruction and remodeling of the pulmonary capillaries, increasing pulmonary vascular resistance [2]. - This increased resistance causes the pulmonary arterial pressure to rise, resulting in **pulmonary arterial hypertension**.
Question 4: Pulmonary embolism is most commonly produced by which of the following?
- A. Trauma
- B. Atherosclerosis
- C. No significant cause
- D. Thrombosis of lower limb veins (Correct Answer)
Explanation: ***Thrombosis of lower limb veins*** - The vast majority of pulmonary emboli originate from **deep vein thromboses (DVTs)** in the lower extremities, particularly the proximal veins (popliteal, femoral, iliac) [1]. - These clots can detach and travel through the right side of the heart to lodge in the **pulmonary arterial system** [1]. - Many patients with suspected PE will have identifiable proximal thrombus in the leg veins [2]. *Trauma* - While severe trauma can increase the risk of DVT due to immobility and venous stasis, **trauma itself is not the direct cause** of the pulmonary embolism. - Trauma is a risk factor for DVT formation, which then leads to PE, rather than directly producing the embolism. *Atherosclerosis* - Atherosclerosis is a disease of arteries involving plaque formation and can lead to conditions like **myocardial infarction** or **stroke**, but it is not a direct source of pulmonary emboli. - While severe atherosclerosis can be a risk factor for DVT in some cases due to systemic inflammation or reduced mobility, it is not the primary mechanism. *No significant cause* - While up to 50% of deep vein thromboses can be asymptomatic, thereby making their "cause" seem insignificant to the patient, PE always has an underlying cause, most commonly **venous thrombosis** [1]. - PE is a serious medical condition with identifiable risk factors and origins, even if the patient is unaware of the initial thrombotic event.
Question 5: Which of the following is the most significant risk factor for pulmonary embolism?
- A. Protein S deficiency
- B. Malignancy (Correct Answer)
- C. Obesity
- D. Progesterone therapy
Explanation: **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.
Question 6: Best predictor of mortality in pulmonary embolism?
- A. Arterial hypoxemia
- B. Chest pain severity
- C. Right ventricular strain (Correct Answer)
- D. D-dimer level
Explanation: ***Right ventricular strain*** - **Right ventricular (RV) strain** is the *best predictor of mortality* in pulmonary embolism (PE) because it indicates the severity of the hemodynamic compromise caused by the increased afterload on the right heart due to the clot [1]. - RV dysfunction, visualized on **echocardiogram** or **CT angiography**, signifies an increased risk of cardiogenic shock and death [2]. *Arterial hypoxemia* - While **hypoxemia** is common in PE and reflects impaired gas exchange, it is not the *most immediate or direct predictor of mortality* compared to RV strain [1]. - The degree of hypoxemia can vary and may not always correlate directly with the *hemodynamic impact* of the PE on the heart. *Chest pain severity* - **Chest pain** is a frequent symptom of PE (often pleuritic), but its *severity does not directly correlate with the embolic burden or the risk of death*. - Many patients with large, life-threatening PEs may have *mild or atypical chest pain*. *D-dimer level* - An elevated **D-dimer** is a useful diagnostic marker to *rule out PE* when negative, but its *predictive value for mortality after a confirmed diagnosis is limited*. - A *high D-dimer* indicates fibrinolysis but does not specifically quantify the mechanical obstruction or its *hemodynamic consequences* on the heart.
Question 7: A 50-year-old patient presents with dyspnea, edema, and an elevated JVP. Which condition is most likely?
- A. Right heart failure (Correct Answer)
- B. Left heart failure
- C. Pneumonia
- D. Asthma
Explanation: ***Right heart failure*** - **Dyspnea**, **edema** (often peripheral), and an **elevated jugular venous pressure (JVP)** are classical signs of right heart failure due to systemic venous congestion [1]. - The inability of the right ventricle to pump blood efficiently leads to blood backing up in the systemic circulation [3]. *Left heart failure* - While it can cause dyspnea, left heart failure primarily leads to **pulmonary congestion** (e.g., crackles, orthopnea) and is less directly associated with prominent peripheral edema and elevated JVP as initial prominent symptoms [2]. - An elevated JVP and significant peripheral edema in left heart failure typically indicate progression to **biventricular failure** [1]. *Pneumonia* - Pneumonia typically presents with acute symptoms like **fever, cough with sputum, pleuritic chest pain**, and localized lung findings, rather than chronic dyspnea, edema, and elevated JVP. - It’s an **infectious lung condition**, not primarily a circulatory disorder causing systemic congestion. *Asthma* - Asthma is a **reversible obstructive airway disease** characterized by episodic **wheezing, cough, and shortness of breath** due to bronchospasm [4]. - It does not typically cause edema or an elevated JVP.
Question 8: Pulmonary embolism is most commonly caused by:
- A. Deep vein thrombosis (DVT) of the leg (Correct Answer)
- B. Fat embolism from pelvic fracture
- C. Cardiac emboli from heart disease
- D. Increased pulmonary pressure (a consequence of PE)
Explanation: ***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.
Question 9: All of the following are features of interstitial lung disease except which one?
- A. Digital clubbing
- B. Coarse crepitations heard on auscultation.
- C. Early productive cough (Correct Answer)
- D. Exertional dyspnea
Explanation: ***Early productive cough*** - Interstitial lung diseases (ILDs) typically cause a **dry, non-productive cough** [1] due to inflammation and fibrosis in the lung parenchyma, rather than significant mucus production. - A productive cough is more characteristic of **bronchial diseases** like bronchitis or bronchiectasis, where there is an increase in mucus secretion. *Exertional dyspnea* - **Exertional dyspnea** is a hallmark symptom of ILDs [1], as the stiffened, fibrotic lungs struggle to expand and efficiently transfer oxygen during physical activity [2]. - This symptom progressively worsens as the disease advances, limiting the patient's exercise capacity. *Digital clubbing* - **Digital clubbing** (thickening of the distal phalanges with increased convexity of the nail) is a common sign in many chronic lung diseases, including various forms of ILD [1]. - It reflects prolonged hypoxemia and is frequently seen in conditions like **idiopathic pulmonary fibrosis**. *Coarse crepitations heard on auscultation* - **Coarse crepitations** (also described as Velcro-like crackles) are a characteristic auscultatory finding in ILDs [1], particularly at the lung bases. - These sounds are thought to result from the sudden opening of collapsed airways and alveoli during inspiration in fibrotic lungs.
Question 10: Irreversible obstructive lung function is seen in which of the following conditions?
- A. Asthma
- B. COPD (Correct Answer)
- C. Pleural effusion
- D. Kyphoscoliosis
Explanation: ***COPD*** - **Chronic Obstructive Pulmonary Disease** (COPD) is characterized by **persistent airflow limitation** that is not fully reversible [3]. - This irreversibility is due to structural changes in the airways and parenchyma, including **emphysema** and **chronic bronchitis** [2]. *Asthma* - Asthma is characterized by **reversible airway obstruction** and hyperresponsiveness, often triggered by allergens or irritants [4]. - While it can be severe, the key distinguishing feature is that the airway limitation can be significantly reversed with bronchodilator treatment [1]. *Pleural effusion* - A pleural effusion involves the **accumulation of fluid in the pleural space**, which is outside the lung tissue. - This condition causes **restrictive lung disease** by compressing the lung, rather than obstructing the airways from within, and is usually treatable by drainage. *Kyphoscoliosis* - **Kyphoscoliosis** is a skeletal deformity of the spine that restricts lung expansion, leading to **restrictive lung disease**. - It does not directly cause an obstructive pattern within the airways, but rather impairs the mechanical ability of the lungs to inflate.
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