Pulmonary Vascular Diseases Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Pulmonary Vascular Diseases. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Pulmonary Vascular Diseases Indian Medical PG Question 1: Drug not used in pulmonary hypertension is:
- A. Endothelin receptor antagonist
- B. Prostacyclin
- C. Alpha blocker (Correct Answer)
- D. Calcium channel blocker
Pulmonary Vascular Diseases 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**.
Pulmonary Vascular Diseases Indian Medical PG 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
Pulmonary Vascular Diseases 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.
Pulmonary Vascular Diseases Indian Medical PG 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
Pulmonary Vascular Diseases 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].
Pulmonary Vascular Diseases Indian Medical PG 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
Pulmonary Vascular Diseases 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.
Pulmonary Vascular Diseases Indian Medical PG Question 5: Heart failure cells are seen in -
- A. Pulmonary edema (Correct Answer)
- B. Pulmonary infarction
- C. Pulmonary abscess
- D. Pulmonary tuberculosis
Pulmonary Vascular Diseases 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.
Pulmonary Vascular Diseases Indian Medical PG 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
Pulmonary Vascular Diseases 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.
Pulmonary Vascular Diseases Indian Medical PG Question 7: Pulmonary embolism is seen in all except?
- A. Oral contraception
- B. Old age
- C. Fanconi anemia (Correct Answer)
- D. Paroxysmal nocturnal hemoglobinuria
Pulmonary Vascular Diseases 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.
Pulmonary Vascular Diseases Indian Medical PG Question 8: Most common cause of idiopathic interstitial pneumonia is
- A. Idiopathic pulmonary fibrosis (Correct Answer)
- B. Organizing pneumonia
- C. Sarcoidosis
- D. Lipoid pneumonia
Pulmonary Vascular Diseases 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.
Pulmonary Vascular Diseases Indian Medical PG 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
Pulmonary Vascular Diseases 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.
Pulmonary Vascular Diseases Indian Medical PG 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)
Pulmonary Vascular Diseases 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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