Cardiac Pathology — MCQs

Cardiac Pathology Indian Medical PG Practice Questions and MCQs

Question 241: Irreversible injury in myocardium occurs at ?

A. 30 minutes (Correct Answer)
B. 5 hours
C. 1 minute
D. 1 hour

Explanation: ***30 minutes*** - Irreversible injury to **myocardial cells** typically begins **at approximately 20-30 minutes of ischemia** [1]. - This time frame represents the critical threshold where cellular damage, including **mitochondrial dysfunction** and **sarcolemmal rupture**, becomes too severe for recovery even with reperfusion [2]. - Beyond this point, cells lose membrane integrity and undergo **coagulative necrosis** [2]. *1 minute* - Myocardial cells can tolerate **ischemia** for a short period, with reversible changes occurring within the first few minutes [4]. - At 1 minute, the injury is still entirely **reversible**, and cells can fully recover if blood flow is restored [5]. - Changes at this stage include depletion of ATP and accumulation of metabolites [5]. *1 hour* - While significant **irreversible damage** has occurred by this time, the onset of irreversibility is earlier, around the 20-30 minute mark [1]. - By 1 hour, a substantial portion of the ischemic myocardium would have undergone **necrosis**, but the critical threshold was crossed 30 minutes earlier [2]. *5 hours* - By 5 hours, nearly all myocardial tissue that was subjected to continuous **ischemia** would have experienced **irreversible injury** and necrosis [3]. - This duration is well beyond the initial window for irreversible changes, indicating extensive and widespread cell death [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 140-142. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 554-556. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 548-550. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 61-62.

Question 242: Vegetations in Libman-Sacks endocarditis are:

A. Large and fragile
B. Small warty along the line of closure of valve
C. Small or medium sized on either or both sides of valve (Correct Answer)
D. Small bland vegetations

Explanation: ***Small or medium sized on either or both sides of valve*** - **Libman-Sacks endocarditis** typically presents with vegetations that are **small to medium in size**, found on either aspect of the valve leaflets [1][2][3]. - These vegetations are **sterile**, non-infectious, and often associated with systemic lupus erythematosus (SLE) [2][3]. *Large and fragile* - Vegetations in Libman-Sacks endocarditis are not typically **large**; they are small or medium [1]. - The term **fragile** is misleading, as the vegetations are not characterized by fragility but by being sturdy yet non-infectious. *Small warty along the line of closure of valve* - While the vegetations are small, they are **not warty** and do not primarily form along the line of closure, which is common in infective endocarditis [1]. - Libman-Sacks vegetations can be found on either side of the valve, unlike warty vegetations [1]. *Small bland vegetations* - Vegetations in Libman-Sacks endocarditis are bland but not solely described as **small and bland**; their presence on either or both sides of the valve is critical [1]. - This option fails to capture the significance of their size and localization in the endocardial lesions associated with SLE. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 568. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 232-233. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 570.

Question 243: Nutmeg liver is associated with which condition?

A. Right sided heart failure (Correct Answer)
B. Increased pulmonary pressure
C. Decreased pulmonary pressure
D. Left sided heart failure

Explanation: ***Right sided heart failure*** - **Nutmeg liver** is a classic finding associated with **congestion** in the liver due to **right-sided heart failure**, leading to the characteristic mottled appearance [1][2]. - **Impaired venous return** from the systemic circulation causes hepatic congestion, resulting in **enlargement and fibrosis** of the liver over time [2]. *Left sided heart failure* - Left-sided heart failure primarily affects the **lungs**, leading to pulmonary congestion rather than hepatic changes. - While it can cause secondary effects on the liver over time, it does not directly cause **nutmeg liver**. *Increased pulmonary pressure* - Increased pulmonary pressure is generally associated with conditions like **pulmonary hypertension**, affecting primarily the **lungs** rather than the liver directly. - It does not lead to the **congestive changes** observed in nutmeg liver [1], which is related to right heart function. *Decreased pulmonary pressure* - Decreased pulmonary pressure would typically improve pulmonary blood flow, therefore having no association with liver congestion. - It does not contribute to the **venous stasis** seen in right heart failure, which is pivotal for nutmeg liver. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, p. 126. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 870-872.

Question 244: Fish mouth stenosis in rheumatic heart disease is due to which of the following mechanisms?

A. Calcification and fibrosis bridging across valvular commissures (Correct Answer)
B. Fibrinoid necrosis
C. Acute inflammation leading to valvular damage
D. Myxomatous degeneration of the valve, which can occur in rheumatic heart disease

Explanation: ***Calcification and fibrosis bridging across valvular commissures*** - In rheumatic heart disease, **calcification and fibrosis** occur as a result of chronic inflammation, leading to **stenosis** of the mitral valve, often described as "fish mouth" appearance [1]. - This mechanism is due to **post-inflammatory scarring** that restricts opening and closing of the valve, characteristic of chronic rheumatic changes [1][2]. *Myxomatous degeneration of the valve* - Myxomatous degeneration primarily affects the **mitral valve** and may cause **prolapse**, but it does not lead to **stenosis**. - This process involves **thinning and elongation** of the valve leaflets, contrasting with the fibrotic changes seen in rheumatic heart disease. *Acute inflammation leading to valvular damage* - Acute inflammation due to **rheumatic fever** typically causes **valvulitis**, not chronic stenosis, which is a late consequence of chronic damage. - This mechanism leads to **valvular regurgitation** rather than stenosis, hence it's not associated with "fish mouth" stenosis. *Fibrinoid necrosis* - Fibrinoid necrosis is seen in **acute rheumatic fever** but does not directly cause **valvular stenosis**; it represents an acute inflammatory response. - This is more related to **immune complex deposition** rather than the chronic fibrotic changes leading to fish mouth morphology in rheumatic heart disease. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 566-567. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 293-294.

Question 245: All of the following are true about rheumatic fever/rheumatic heart disease except:

A. Presence of Anitschkow cells is pathognomonic
B. MacCallum plaques are commonly seen in left atrium
C. Mitral stenosis is evident in the early stage of the disease (Correct Answer)
D. Mitral valve is most commonly affected

Explanation: ***Mitral stenosis is evident in the early stage of the disease*** - **Mitral stenosis** is typically a **late complication** of rheumatic heart disease [1], developing **years or even decades** after the initial acute rheumatic fever. - The **early stages** of rheumatic heart disease are characterized by **mitral regurgitation** (and sometimes aortic regurgitation) due to **acute inflammation** and **valvulitis** causing incomplete valve closure. - Stenosis develops only after **repeated inflammatory episodes** lead to **fibrosis, calcification**, and **fusion of commissures** [1]. - This is clearly **FALSE** and is the correct answer to this "except" question. *Presence of Anitschkow cells is pathognomonic* - **Anitschkow cells** (caterpillar cells) are highly **characteristic histiocytes** with elongated nuclei seen in **Aschoff bodies** of rheumatic fever [1]. - They are considered **virtually pathognomonic** in the appropriate clinical context of rheumatic carditis [1]. - While theoretically they might be seen in other conditions, their presence in myocardial Aschoff bodies is **diagnostically specific** for rheumatic fever. - This statement is considered **TRUE** for examination purposes. *MacCallum plaques are commonly seen in left atrium* - **MacCallum plaques** are areas of **fibrous thickening** of the left atrial endocardium, typically on the **posterior wall** near the mitral valve. - These result from **regurgitant jet lesions** from the damaged mitral valve. - This is a **TRUE** statement and a classic pathological finding in rheumatic heart disease. *Mitral valve is most commonly affected* - The **mitral valve** is the most frequently affected valve in **rheumatic heart disease** (75-80% of cases) [1]. - The **aortic valve** is second most common, while tricuspid and pulmonary valves are rarely affected [1]. - This is a **TRUE** statement. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 566-567.

Question 246: What is the most common primary neoplasm of the heart in adults?

A. Lipoma
B. Myxoma (Correct Answer)
C. Papillary fibroelastoma
D. Rhabdomyoma

Explanation: ***Myxoma*** - It is the most common **primary cardiac neoplasm** in adults [1][2], typically located in the **left atrium** [1][2]. - Myxomas can cause **obstruction** and **systemic embolization** [1][2], presenting with symptoms like dyspnea and syncope. *Papillary fibroelastoma* - This tumor is less common and usually occurs on the heart's **valves**, often causing **embolic events** but not classified as the most common. - It is generally **asymptomatic** unless it causes significant obstruction or embolism. *Lipoma* - While lipomas are common **benign tumors** [2], they make up a smaller percentage of cardiac tumors and usually do not present with **distinct symptoms** as myxomas do. - These tumors are typically **asymptomatic** and found incidentally during imaging. *Rhabdomyoma* - This is more often seen in **children** [2], particularly associated with **tuberous sclerosis**, making it uncommon in adults. - Rhabdomyomas are also **benign**, but its incidence is notably lower compared to myxomas in the adult population. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 583-584. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 304-306.

Question 247: At what time is significant fibrous scar formation complete in myocardial infarction?

A. 6 weeks (Correct Answer)
B. 6 months
C. 6 days
D. 30 days

Explanation: ***6 weeks*** - By **6 weeks**, the necrotic myocardium has been completely removed and replaced by dense fibrous scar tissue [1], which is structurally strong but non-contractile. - This phase marks the completion of the healing process, with the scar being fully formed and mature. *6 months* - While the scar tissue continues to remodel and strengthen over time, **significant fibrous scar formation** is already complete by 6 weeks [1]. - By 6 months, the scar is fully mature and stabilized, but the initial robust scar formation phase has long passed. *6 days* - At **6 days**, the myocardial infarction is primarily characterized by the initial stages of **granulation tissue formation** [2] and the ongoing removal of necrotic debris. - Significant **fibrous scar formation** has not yet occurred, as the tissue is still highly cellular and vascular. *30 days* - By **30 days (4 weeks)**, a well-developed **collagenous scar** is present, but it is still undergoing remodeling and strengthening. - While a scar is present, it is not yet as dense or as mature as the scar seen at 6 weeks, which is considered the time of significant fibrous scar formation [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 552-554. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552.

Question 248: The infarcted myocardium is completely replaced by dense fibrous scar tissue, which is typically seen by -

A. 2 weeks
B. 4 weeks
C. 6 weeks (Correct Answer)
D. 10 weeks

Explanation: ***6 weeks*** - At **6 weeks post-myocardial infarction**, significant scar tissue formation occurs as a result of **fibroblast migration and collagen deposition** [1]. - This timeline aligns with the typical process of myocardial healing where **necrotic tissue is replaced** by fibrous tissue, stabilizing the heart wall [2]. *4 weeks* - By **4 weeks**, while some scar formation begins, it is not yet fully established as the healing process typically continues beyond this point [1]. - **Inflammatory infiltrates** and early granulation tissue are still prevalent rather than mature scar tissue at this stage [1]. *2 weeks* - At **2 weeks**, the myocardium is characterized by significant necrosis with ongoing **inflammation** and the presence of **acute phase reactants** [1]. - Scar formation is minimal, and the tissue is still weak and vulnerable to complications like rupture [2]. *10 weeks* - By **10 weeks**, while scar tissue is indeed established, this option indicates a timeline beyond what is typically seen for the initial healing process. - The infarcted area is already fully replaced, making this later timeline less relevant to the immediate post-infarction healing process. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 147-148.

Question 249: A young female patient presents for a routine examination and is found to have a mid-systolic click on auscultation, with no history of rheumatic heart disease. The histopathological examination is most likely to show which of the following?

A. Myxomatous degeneration of the mitral valve (Correct Answer)
B. Fibrinous deposition on the papillary muscle due to infective endocarditis
C. Aschoff nodule associated with rheumatic heart disease
D. Rupture of chordae tendineae leading to acute mitral regurgitation

Explanation: ***Myxomatous degeneration and prolapse of the mitral valve*** - The presence of a **mid-systolic click** in a young female patient is commonly linked to **mitral valve prolapse**, which is characterized by myxomatous degeneration. - Histologically, this condition involves **expansion of the spongiosa** layer due to accumulation of glycosaminoglycans, leading to valve redundancy. *Aschoff nodule on the mitral valve* - Aschoff nodules are associated with **rheumatic fever** [1], but this patient lacks a history of **rheumatic heart disease**. - These nodules are typically found in the myocardium and not specifically on the mitral valve in cases without rheumatic background. *Rupture of chordae tendinae* - While chordae rupture can cause acute mitral valve insufficiency, it is not a primary histopathological finding in an otherwise **asymptomatic young patient**. - This condition usually presents with acute symptoms and is related to **trauma** or severe mitral valve disease, unlike the findings here. *Fibrinous deposition on the tip of papillary muscle* - Fibrinous deposition typically indicates a **reactive process**, such as infective endocarditis, which does not correlate with a mere mid-systolic click. - This finding would not be expected in a routine examination of an otherwise healthy young female with no murmur indicating significant valvular disease. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 566-567.

Question 250: Which of the following is a stain for heart failure cells?

A. PAS
B. Prussian blue (Correct Answer)
C. Sudan black
D. Oil red O

Explanation: ***Prussian blue*** - Heart failure cells are **alveolar macrophages** that have phagocytosed **hemosiderin** (iron-laden pigment) from extravasated red blood cells due to **pulmonary congestion** in heart failure. - The **Prussian blue stain** specifically detects the ferric iron (Fe3+) within hemosiderin, making it the appropriate stain for identifying heart failure cells. *PAS* - **Periodic Acid-Schiff (PAS)** stain detects **carbohydrates** such as glycogen, mucins, and glycoproteins, and is used for conditions like **glycogen storage diseases** or certain fungal infections. - It does not specifically identify iron or hemosiderin, hence it is not used for heart failure cells. *Sudan black* - **Sudan black** is a **lipid stain** used to identify intracellular **lipids** and distinguish between different types of leukemia based on the presence of myeloperoxidase. - It is not designed to detect iron or hemosiderin and thus is not used for heart failure cells. *Oil red O* - **Oil Red O** is another common stain for demonstrating neutral **lipids** and triglycerides in frozen tissue sections. - Like Sudan black, it is a lipid stain and therefore would not be helpful in identifying the iron-laden hemosiderin characteristic of heart failure cells.

Practice by Chapter

Congenital Heart Disease

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Ischemic Heart Disease

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Hypertensive Heart Disease

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Valvular Heart Disease

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Myocarditis and Cardiomyopathies

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Pericardial Disease

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Cardiac Tumors

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Heart Failure Pathophysiology

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Cardiac Transplantation Pathology

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Endocarditis

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