Cardiac Pathology Practice Questions

Q: 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?

Myxomatous degeneration of the mitral valve. ***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.

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

6 weeks. ***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.

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

Prussian blue. ***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.

Q: Which of the following statements about acute rheumatic fever is false?

Microthrombi in arteriole. ***Microthrombi in arteriole*** - This statement is correct; **microthrombi** are not typically associated with acute rheumatic fever, making this option false. - Acute rheumatic fever primarily involves **immune-mediated processes** rather than direct thrombosis in small vessels [1]. *Focal myocardial fiber necrosis* - In acute rheumatic fever, **focal necrosis** is not a primary characteristic; rather, the condition may show **myocarditis** without extensive necrosis. - Other cardiac manifestations include **Aschoff bodies**, which are collections of immune cells rather than necrotic myocardial tissue [1]. *Aschoff nodule in mycoacardium* - **Aschoff nodules** are pathognomonic for rheumatic fever, occurring in the heart tissue as a result of the autoimmune response [1]. - They are areas of granulomatous inflammation, not typically associated with straightforward necrosis but rather with a reaction to the preceding streptococcal infection [1]. *Lymphocytic myocarditis* - Acute rheumatic fever can lead to **lymphocytic infiltration** in the myocardium, but describing it as myocarditis simplifies the broader range of findings seen in the disease [1]. - The involvement often includes a mixed inflammatory infiltrate, not solely lymphocytic [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 566-567.

Q: Flat vegetations in valve pockets due to deposition on previously normal valve surfaces are characteristic of:

Non-bacterial thrombotic endocarditis (NBTE). ***Rheumatic heart disease*** - Characterized by **flat vegetations** on heart valves, known as **Aschoff bodies**, which represent the sequelae of rheumatic fever [1]. - Vegetations in this condition occur due to **non-endothelial attachment**, leading to valve damage and dysfunction . *Rheumatic heart disease* - This is a repeat nd does not provide a different context, hence it is incorrect. - Must include distinguishing clinical features or findings that clearly differentiate it from other listed conditions. *Infective endocarditis* - Characterized by **irregular, bulky vegetations** on valves due to microbial infection, differentiating from the flatter vegetations seen in rheumatic heart disease [1]. - Often associated with **systemic symptoms** such as fever and embolic phenomena, which are not present here. *Non-bacterial thrombotic endocarditis (NBTE)* - Typically presents with **small vegetations** that may also be flat, but are usually found in the context of a malignancy or systemic disease [1]. - These vegetations are primarily **non-infectious**, i.e., not due to current infection, unlike in infective endocarditis. **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. The Heart, p. 566.

Q: Which among the following is true about non-bacterial thrombotic endocarditis (NBTE)?

Does not elicit an inflammatory reaction. ***Vegetations elicit inflammatory reaction*** - In non-bacterial thrombotic embolism (NBTE), **vegetations do not provoke a significant inflammatory response** compared to infectious endocarditis. - The vegetations seen in NBTE are typically **non-destructive**, lacking the classic inflammatory signs. *Non invasive in nature* - While NBTE is often associated with underlying malignancy and can present similarly to infective endocarditis, it does not undergo the same **invasive changes**. - This statement is misleading since although the lesions are non-infectious, they can still cause significant **embolic phenomena**. *Thrombi on the leaflets of the cardiac valves* - NBTE is characterized by **sterile vegetations** on heart valves, as opposed to **thrombi**, which are clots formed by platelets and fibrin [1]. - These vegetations attach to **valve surfaces** without causing the same level of damage seen in bacterial endocarditis [1]. *Marantic endocarditis* - This term is often used interchangeably with NBTE, describing the presence of **non-bacterial vegetations** related to states of hypercoagulability, particularly in malignancy. - While NBTE does have marantic features, this oes not accurately depict a false statement about the characteristics of NBTE. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 568.

Q: What is the approximate time at which the quantity of ATP within ischemic cardiac myocytes is reduced to 10% of the original?

10 minutes. ***40 minutes*** - Research indicates that ATP levels in ischemic cardiac myocytes can be reduced to 10% of the original within approximately **40 minutes** of sustained ischemia. - This depletion directly leads to severe **metabolic dysfunction** and contributes to **cardiac cell injury**. *10 minutes* - Within this time frame, ATP levels have not yet dropped significantly, typically remaining above 50% of the original concentration. - Early ischemic changes may begin within minutes, but profound depletion occurs later. *20 minutes* - At 20 minutes of ischemia, ATP levels are still generally above **20-30%**, not yet reaching the critical depletion point of 10% [1]. - The heart can still sustain some function and viability during this period [1]. *<2 minutes* - Ischemia lasts too briefly for ATP levels to significantly decline; any effects at this stage are usually minimal. - Cells can maintain ATP levels and function quite well for several minutes before noticeable depletion occurs. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 554-556.

Q: The cells seen after 72 hours in the infarcted area in myocardial infarction are

Macrophages. ***Macrophages*** - After 72 hours in myocardial infarction, **macrophages** will infiltrate the infarcted area to clear cellular debris and promote healing [1][2]. - They play a crucial role in the later stages of **inflammation** and tissue repair following the initial neutrophilic response [1][2]. *Monocytes* - Monocytes circulate in the bloodstream and are different from the tissue-present macrophages, which are the ones actively involved in the healing process post-infarction. - While they do transform into macrophages during inflammation, they are **not the predominant cells** found in the infarcted area after 72 hours [2]. *Lymphocytes* - Lymphocytes are primarily involved in the **adaptive immune response** and are usually present later, after initial inflammation, rather than within the first few days post-infarction. - Their role is less significant in the acute phase of myocardial infarction compared to macrophages and neutrophils. *Neutrophils* - Neutrophils are typically the predominant cells in the early stages (within the first 24-48 hours) of myocardial infarction, responding to acute injury [1][2]. - By 72 hours, their numbers start to decline as macrophages become more prominent in the healing process [1][2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 89. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552.

Q: Earliest light microscopic change in myocardial infarction is:

Waviness of the fibers. ***Waviness of the fibers*** - The earliest light microscopic change in myocardial infarction is **waviness of the fibers**, which occurs within **30 minutes** post-infarction [1]. - This change indicates an initial response to ischemic injury, manifesting as **disruption in the alignment** of muscle fibers. *Coagulative necrosis* - Coagulative necrosis appears later, typically **within a few hours** to days after the onset of infarction, indicating **tissue death** due to lack of blood supply [1]. - This change is characterized by **loss of cellular outlines** and preservation of the overall tissue architecture, which is not the earliest finding. *Phagocytic infiltration* - Phagocytic infiltration, involving macrophages, occurs **days later**, following neutrophilic infiltration, and reflects the body's **cleanup process** post-necrosis. - This response is not seen until the **acute phase** of myocardial injury has progressed further. *Neutrophilic infiltration* - Neutrophilic infiltration generally starts about **4 to 6 hours** after infarction, signifying an inflammatory response but is not the earliest light microscopic change [1]. - This process involves **recruitment of immune cells** to the site of injury, reflecting ongoing damage rather than initial changes [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 548-550.

Question 1

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?

Accepted Answer

Myxomatous degeneration of the mitral valve

Answer

Fibrinous deposition on the papillary muscle due to infective endocarditis

Answer

Aschoff nodule associated with rheumatic heart disease

Answer

Rupture of chordae tendineae leading to acute mitral regurgitation

Question 2

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

Accepted Answer

6 weeks

Answer

2 weeks

Answer

4 weeks

Answer

10 weeks

Question 3

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

Accepted Answer

Prussian blue

Answer

PAS

Answer

Sudan black

Answer

Oil red O

Question 4

Which of the following statements about acute rheumatic fever is false?

Accepted Answer

Microthrombi in arteriole

Answer

Focal myocardial fiber necrosis

Answer

Lymphocytic myocarditis

Answer

Aschoff nodule in myocardium

Question 5

Flat vegetations in valve pockets due to deposition on previously normal valve surfaces are characteristic of:

Accepted Answer

Non-bacterial thrombotic endocarditis (NBTE)

Answer

Infective endocarditis

Answer

Libman-Sacks endocarditis

Answer

Rheumatic heart disease

Question 6

Which among the following is true about non-bacterial thrombotic endocarditis (NBTE)?

Accepted Answer

Does not elicit an inflammatory reaction

Answer

Characterized by small, non-invasive vegetations.

Answer

Associated with hypercoagulable states and systemic diseases

Answer

Commonly associated with malignancy, especially adenocarcinomas.

Question 7

A 50-year-old male presented with signs and symptoms of restrictive heart disease. A right ventricular endomyocardial biopsy revealed deposition of extracellular eosinophilic hyaline material. On transmission electron microscopy, this material is most likely to reveal the presence of:

Accepted Answer

Non-branching filaments of indefinite length

Answer

Weibel-Palade bodies

Answer

Concentric whorls of lamellar structures

Answer

Cross banded fibres with 67 nm periodicity

Question 8

What is the approximate time at which the quantity of ATP within ischemic cardiac myocytes is reduced to 10% of the original?

Accepted Answer

10 minutes

Answer

<2 minutes

Answer

20 minutes

Answer

40 minutes

Question 9

The cells seen after 72 hours in the infarcted area in myocardial infarction are

Accepted Answer

Macrophages

Answer

Neutrophils

Answer

Lymphocytes

Answer

Monocytes

Question 10

Earliest light microscopic change in myocardial infarction is:

Accepted Answer

Waviness of the fibers

Answer

Neutrophilic infiltration

Answer

Phagocytic infiltration

Answer

Coagulative necrosis

Cardiac Pathology — MCQs

Cardiac Pathology — MCQs

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