Pulmonary Vascular Diseases — MCQs
Drug not used in pulmonary hypertension is:
Which of the following is the most significant risk factor for pulmonary embolism?
A patient develops pulmonary thromboembolism most commonly due to what?
Which of the following is not typically seen on a chest X-ray in pulmonary artery hypertension?
Heart failure cells are seen in -
Which of the following conditions is LEAST likely to cause peripheral edema?
Pulmonary embolism is seen in all except?
Most common cause of idiopathic interstitial pneumonia is
A CT scan shows the 'crazy paving' pattern in both lungs. Which bronchoalveolar lavage finding would confirm pulmonary alveolar proteinosis?
The perinatal complications of a diabetic pregnancy include : 1. Small for Gestational Age baby 2. Stillbirth 3. Hypoglycaemia 4. Respiratory distress syndrome Select the correct answer from the code given below :
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: 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 3: A patient develops pulmonary thromboembolism most commonly due to what?
- A. Deep Vein Thrombosis (DVT) (Correct Answer)
- B. Chronic Venous Hypertension
- C. Disseminated intravascular coagulation (DIC)
- D. Inherited Thrombophilia
Explanation: ***Deep Vein Thrombosis (DVT)*** - **Deep vein thrombosis (DVT)** is the most common cause of pulmonary thromboembolism, as clots from deep veins, typically in the legs, travel to the lungs [1]. - The initial clot formation in DVT is often multifactorial, involving elements of **Virchow's triad** (venous stasis, endothelial injury, and hypercoagulability) [1]. *Chronic Venous Hypertension* - **Chronic venous hypertension** results from sustained high pressure in leg veins, leading to symptoms like edema, skin changes, and ulcers, but does not directly cause emboli. - It's a consequence of venous insufficiency and doesn't involve the formation of typical occlusive thrombi that can embolize to the pulmonary arteries. *Disseminated intravascular coagulation (DIC)* - **Disseminated intravascular coagulation (DIC)** is a severe, systemic condition characterized by widespread activation of coagulation, leading to microthrombi formation and consumption of clotting factors, often resulting in bleeding. - While small thrombi can form, the primary manifestation is diffuse bleeding, and the thrombi are usually diffuse microvascular clots rather than large, embolizing thrombi to the pulmonary arteries. *Inherited Thrombophilia* - **Inherited thrombophilias** are genetic predispositions to excessive clotting and are risk factors for DVT, but they are not the direct cause of pulmonary embolism. - They increase the likelihood of developing DVT, which then *in turn* can lead to pulmonary embolism [1].
Question 4: Which of the following is not typically seen on a chest X-ray in pulmonary artery hypertension?
- A. Enlargement of central arteries
- B. Peripheral pruning
- C. Narrowing of central arteries (Correct Answer)
- D. None of the options
Explanation: ***Narrowing of central arteries*** - **Pulmonary artery hypertension** is characterized by the **enlargement of the central pulmonary arteries** due to increased pressure. - **Narrowing of central arteries** would contradict the hemodynamic changes seen in pulmonary hypertension. - This is the finding that is **NOT typically seen**, making this the correct answer. *Enlargement of central arteries* - This is a **hallmark radiographic finding** in pulmonary hypertension, reflecting the **dilatation of the main and proximal pulmonary arteries** due to increased pressure. - The **pulmonary artery segment becomes prominent**, often appearing convex on the left heart border. *Peripheral pruning* - This refers to the **abrupt tapering and loss of peripheral pulmonary vascular markings**, indicating reduced blood flow to the distal lung parenchyma. - It is a **common finding in advanced pulmonary hypertension**, as the distal vessels constrict and become obliterated. *None of the options* - This is incorrect since **narrowing of central arteries** is clearly not a typical finding in pulmonary hypertension.
Question 5: Heart failure cells are seen in -
- A. Pulmonary edema (Correct Answer)
- B. Pulmonary infarction
- C. Pulmonary abscess
- D. Pulmonary tuberculosis
Explanation: ***Pulmonary edema*** - Heart failure cells, or **hemosiderin-laden macrophages**, are typically found in the lungs during pulmonary edema due to left-sided heart failure [1]. - This condition leads to **increased pulmonary capillary pressure**, causing leakage of red blood cells into the alveoli, which macrophages then phagocytose [1]. *Pulmonary abscess* - Characterized by a **localized collection of pus** within the lung, typically due to infection, rather than heart failure. - Does not typically involve **hemosiderin-laden macrophages** indicative of chronic pulmonary congestion. *Pulmonary infarction* - Causes **tissue death** due to obstruction of blood flow, leading to necrosis rather than heart failure cells. - Typically presents with **infarcted lung tissue**, showing a different pathological process than seen in heart failure. *PulmonaryTB* - Primarily caused by **Mycobacterium tuberculosis**, leading to cavitary lesions and granulomatous inflammation, not heart failure cells. - The presence of **caseating granulomas** is characterized but does not indicate chronic pulmonary congestion. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 536-538.
Question 6: Which of the following conditions is LEAST likely to cause peripheral edema?
- A. Nephrotic syndrome
- B. Venous insufficiency (Correct Answer)
- C. Congestive heart failure
- D. Hyperthyroidism
Explanation: Venous insufficiency - **Venous insufficiency** is a common cause of peripheral edema due to impaired venous return leading to fluid accumulation in the lower extremities. - It is characterized by **pitting edema**, skin changes, and often associated with varicose veins. *Nephrotic syndrome* - **Nephrotic syndrome** causes generalized edema, including peripheral edema, due to significant **proteinuria** [1] leading to hypoalbuminemia and decreased plasma oncotic pressure. - The reduced oncotic pressure causes fluid to shift from the intravascular space into the interstitial space. *Congestive heart failure* - **Congestive heart failure** leads to peripheral edema primarily due to increased hydrostatic pressure in the capillaries as a result of the heart's inability to pump blood effectively. - This results in fluid extravasation into the interstitial tissues, often presenting as **pitting edema** in the ankles and legs. *Hyperthyroidism* - While **hyperthyroidism** is not a classic cause of significant peripheral edema, some patients can develop **pretibial myxedema**, which is a condition associated with autoimmune thyroid disease. - This form of edema is typically non-pitting and localized, and it is not a direct result of increased hydrostatic or decreased oncotic pressure in the same way as conditions like CHF or nephrotic syndrome.
Question 7: Pulmonary embolism is seen in all except?
- A. Oral contraception
- B. Old age
- C. Fanconi anemia (Correct Answer)
- D. Paroxysmal nocturnal hemoglobinuria
Explanation: ***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.
Question 8: Most common cause of idiopathic interstitial pneumonia is
- A. Idiopathic pulmonary fibrosis (Correct Answer)
- B. Organizing pneumonia
- C. Sarcoidosis
- D. Lipoid pneumonia
Explanation: ***Idiopathic pulmonary fibrosis (IPF)*** - This is the **most common** form of idiopathic interstitial pneumonia, accounting for approximately **50-60% of all IIP cases** - Represents the **most severe** IIP subtype with poor prognosis - Characterized by progressive **usual interstitial pneumonia (UIP) pattern** with fibroblastic foci and honeycombing - Presents with progressive dyspnea, dry cough, and restrictive lung disease *Organizing pneumonia* - While **Cryptogenic Organizing Pneumonia (COP)** is a form of idiopathic interstitial pneumonia, it is **much less common than IPF** [1] - Characterized by **intra-alveolar granulation tissue (Masson bodies)** [1] - Better prognosis and steroid-responsive compared to IPF [1] *Sarcoidosis* - This is **NOT classified as an idiopathic interstitial pneumonia** - It is a separate **multisystem granulomatous disease** with **non-caseating granulomas** - Has a distinct etiology related to altered immune response - Does not belong to the IIP classification system *Lipoid pneumonia* - This is **NOT an idiopathic interstitial pneumonia** - Results from **aspiration of lipid substances** causing exogenous lipoid pneumonia - Has a **known extrinsic cause**, therefore not "idiopathic" - Not part of the IIP classification **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 330-331.
Question 9: A CT scan shows the 'crazy paving' pattern in both lungs. Which bronchoalveolar lavage finding would confirm pulmonary alveolar proteinosis?
- A. Milky fluid with PAS-positive material (Correct Answer)
- B. Hemosiderin-laden macrophages
- C. Eosinophilia >25%
- D. CD4/CD8 ratio >3.5
Explanation: ***Milky fluid with PAS-positive material*** - A **milky, turbid bronchoalveolar lavage (BAL) fluid** is characteristic of **pulmonary alveolar proteinosis (PAP)** due to the accumulation of lipoproteinaceous material [1]. - **Periodic Acid-Schiff (PAS) staining** confirms the presence of this **glycoprotein-rich surfactant material**, which reacts positively [1]. *Hemosiderin-laden macrophages* - These are indicative of **pulmonary hemorrhage**, not PAP. - They are commonly seen in conditions like **Goodpasture syndrome** or **idiopathic pulmonary hemosiderosis**. *Eosinophilia >25%* - Significant **eosinophilia in BAL fluid** is a hallmark of **eosinophilic pneumonia**, a different interstitial lung disease. - It suggests an **allergic or hypersensitivity reaction** in the lungs. *CD4/CD8 ratio >3.5* - An **elevated CD4/CD8 ratio** in BAL fluid is highly suggestive of **sarcoidosis**, a granulomatous inflammatory disease. - This ratio reflects the **lymphocyte population** in the alveoli, not lipoproteinaceous accumulation. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 703-705.
Question 10: The perinatal complications of a diabetic pregnancy include : 1. Small for Gestational Age baby 2. Stillbirth 3. Hypoglycaemia 4. Respiratory distress syndrome Select the correct answer from the code given below :
- A. 1 and 2 only
- B. 1 and 4 only
- C. 1 and 3 only
- D. 2 and 3 only (Correct Answer)
Explanation: ***2 and 3 only*** - **Stillbirth** is a major perinatal complication of diabetic pregnancy due to placental insufficiency, fetal hyperglycemia, and maternal ketoacidosis, occurring in up to 2-5% of poorly controlled cases. - **Neonatal hypoglycemia** occurs in 25-40% of infants of diabetic mothers due to fetal hyperinsulinemia. After delivery, the sudden withdrawal of maternal glucose supply while fetal insulin levels remain elevated leads to profound hypoglycemia within 1-2 hours of birth. - While **respiratory distress syndrome (RDS)** is also a recognized complication (due to delayed surfactant production from hyperinsulinemia), this question focuses on the most characteristic and immediate life-threatening perinatal complications requiring urgent monitoring and intervention. *1 and 2 only* - **Small for Gestational Age (SGA)** is NOT a typical complication of diabetic pregnancy. The classic presentation is **macrosomia** (Large for Gestational Age) due to fetal hyperinsulinemia driving increased glucose uptake and fat deposition. - SGA may occur in pre-gestational diabetes with severe vasculopathy, but this represents a minority of cases and is not the typical pattern. *1 and 4 only* - **Small for Gestational Age** is incorrect for the reasons stated above - diabetic pregnancies characteristically produce macrosomic infants, not growth-restricted ones. - **Respiratory distress syndrome** is indeed a complication, but the inclusion of the incorrect statement 1 makes this option wrong. *1 and 3 only* - **Small for Gestational Age** is fundamentally inconsistent with the pathophysiology of diabetic pregnancy, which involves fetal hyperglycemia and hyperinsulinemia leading to excessive growth. - **Hypoglycemia** is correct, but this option is invalidated by the inclusion of SGA.
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