Cardiac Pathology Practice Questions

Q: The MOST COMMON cause of concentric hypertrophy of left ventricle is?

Hypertension. ***Hypertension*** - Chronic **hypertension** is the most common cause of **pressure overload** on the left ventricle, leading to concentric hypertrophy [1]. - In response to the increased afterload, the ventricular wall thickens uniformly inward, reducing the chamber size while maintaining normal wall stress [2]. - Due to its high prevalence (30-40% of adults), hypertension is epidemiologically the most frequent cause of concentric LVH [1]. *Aortic stenosis* - While **aortic stenosis** is the classic pathological cause of **pressure overload** and concentric hypertrophy [2], **hypertension** is more prevalent in the population. - Aortic stenosis causes fixed outflow obstruction, leading to significant pressure work for the left ventricle. - This is the second most common cause but occurs in only 2-5% of elderly patients. *Mitral stenosis* - **Mitral stenosis** primarily causes pressure overload on the **left atrium** and **pulmonary circulation**, not the left ventricle. - It doesn't typically lead to **left ventricular hypertrophy** directly; instead, it causes left atrial enlargement and right ventricular hypertrophy. *Aortic regurgitation* - **Aortic regurgitation** results in **volume overload** of the left ventricle due to blood flowing back into the chamber during diastole. - This typically leads to **eccentric hypertrophy**, where the chamber dilates and the wall thickens proportionally, rather than concentric hypertrophy [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 560-562. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 536.

Q: Vegetations in Libman-Sacks endocarditis are:

Small or medium sized on either or both sides of valve. ***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.

Q: Nutmeg liver is associated with which condition?

Right sided heart failure. ***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.

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

6 weeks. ***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.

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

Myxoma. ***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.

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.

Question 1

The MOST COMMON cause of concentric hypertrophy of left ventricle is?

Accepted Answer

Hypertension

Answer

Aortic stenosis

Answer

Mitral stenosis

Answer

Aortic regurgitation

Question 2

Vegetations in Libman-Sacks endocarditis are:

Accepted Answer

Small or medium sized on either or both sides of valve

Answer

Large and fragile

Answer

Small warty along the line of closure of valve

Answer

Small bland vegetations

Question 3

Nutmeg liver is associated with which condition?

Accepted Answer

Right sided heart failure

Answer

Increased pulmonary pressure

Answer

Decreased pulmonary pressure

Answer

Left sided heart failure

Question 4

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

Accepted Answer

Calcification and fibrosis bridging across valvular commissures

Answer

Fibrinoid necrosis

Answer

Acute inflammation leading to valvular damage

Answer

Myxomatous degeneration of the valve, which can occur in rheumatic heart disease

Question 5

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

Accepted Answer

Mitral stenosis is evident in the early stage of the disease

Answer

Presence of Anitschkow cells is pathognomonic

Answer

MacCallum plaques are commonly seen in left atrium

Answer

Mitral valve is most commonly affected

Question 6

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

Accepted Answer

6 weeks

Answer

6 months

Answer

6 days

Answer

30 days

Question 7

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

Accepted Answer

Myxoma

Answer

Lipoma

Answer

Papillary fibroelastoma

Answer

Rhabdomyoma

Question 8

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 9

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 10

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

Accepted Answer

Prussian blue

Answer

PAS

Answer

Sudan black

Answer

Oil red O

Cardiac Pathology — MCQs

Cardiac Pathology — MCQs

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