Cardiac Pathology Practice Questions

Q: Which of the following is not seen in the early phase of myocardial infarction on microscopy?

Fibrosis. **Explanation:** The correct answer is **Fibrosis**. Myocardial infarction (MI) follows a predictable chronological sequence of morphological changes [1]. Fibrosis represents the final stage of the healing process, where dead myocytes are replaced by a collagenous scar. This process typically begins around **2 weeks** post-infarction and can take up to **2 months** to complete [2]. Therefore, it is never seen in the "early phase" (the first few days) of an MI. **Analysis of Incorrect Options:** * **Coagulation Necrosis:** This is the hallmark of irreversible ischemic injury in the heart [1]. It typically becomes visible under light microscopy within **4–12 hours**. Features include "wavy fibers" and loss of nuclei (karyolysis) [1]. * **Edema:** This occurs very early (within **4–12 hours**) as a result of vascular leakage and cell membrane failure following ischemic injury [1]. * **Hemorrhage:** Microvascular injury during the acute phase leads to the extravasation of red blood cells into the interstitium, often seen alongside the early neutrophilic infiltrate (**12–24 hours**) [1]. **NEET-PG High-Yield Pearls:** * **0–30 mins:** Reversible injury; no light microscopy (LM) changes [1]. * **4–12 hours:** First visible LM changes (Coagulation necrosis, edema, hemorrhage) [1]. * **1-3 days:** Peak of **Neutrophilic infiltration** (highest risk of fibrinous pericarditis) [1]. * **3–7 days:** Macrophage infiltration and beginning of **Granulation tissue** (highest risk of free wall rupture/ventricular septal defect) [1]. * **10 days–2 weeks:** Well-established granulation tissue [2]. * **>2 months:** Dense collagenous **Fibrosis/Scarring** [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. 552-554.

Q: A female with a history of recurrent rheumatic fever is on prophylactic penicillin therapy. Which heart valve is least commonly affected in chronic rheumatic heart disease?

Pulmonary valve. **Explanation:** Chronic Rheumatic Heart Disease (RHD) is a sequela of acute rheumatic fever characterized by permanent deformity of the heart valves [1]. The frequency of valvular involvement is directly related to the **hemodynamic stress** (pressure) experienced by the valves in the left side of the heart compared to the right. **1. Why the Pulmonary Valve is Correct:** The **Pulmonary valve** is the least commonly affected valve in RHD. This is because the right-sided chambers operate under significantly lower pressures than the left-sided chambers. Isolated pulmonary involvement is almost never seen; it typically only occurs in the context of severe multi-valvular disease involving the mitral and aortic valves. **2. Analysis of Incorrect Options:** * **Mitral Valve (Option A):** This is the **most common** valve affected in RHD (involved in nearly 95-100% of cases) [2]. The high pressure in the left ventricle during systole subjects the mitral valve to significant mechanical stress, leading to commissural fusion and "fish-mouth" stenosis. * **Aortic Valve (Option B):** This is the **second most common** valve affected. It is usually involved along with the mitral valve, though isolated aortic involvement can occur (more common in males). * **Tricuspid Valve (Option C):** While less common than left-sided valves, it is affected more frequently than the pulmonary valve [3]. It is almost always associated with concomitant mitral or aortic disease. **Clinical Pearls for NEET-PG:** * **Order of frequency:** Mitral > Aortic > Tricuspid > Pulmonary (M > A > T > P). * **Most common lesion:** Mitral Stenosis (MS) is the hallmark of chronic RHD [2]. * **Pathognomonic finding:** Aschoff bodies (in the acute phase); "Fish-mouth" or "Button-hole" appearance (in chronic MS). * **MacCallum’s Patch:** An area of endocardial thickening usually found in the posterior wall of the left atrium due to regurgitant jets.

Q: Which artery is most commonly involved in Myocardial Infarction (MI)?

Left Anterior Descending artery (LAD). **Explanation:** The **Left Anterior Descending artery (LAD)** is the most common site of coronary artery occlusion [1], accounting for approximately **40-50%** of all Myocardial Infarctions. Known clinically as the **"Widow Maker,"** the LAD supplies the anterior wall of the left ventricle, the apex, and the anterior two-thirds of the interventricular septum. Its high susceptibility to atherosclerosis is attributed to its anatomical course and the high hemodynamic stress it endures. **Analysis of Options:** * **Left Anterior Descending (LAD):** Correct. It is the most frequently involved vessel, followed by the RCA and then the LCX [1]. * **Right Coronary Artery (RCA):** Incorrect. It is the second most common (30-40%), typically resulting in Inferior Wall MI [3]. * **Left Circumflex artery (LCX):** Incorrect. It is the third most common (15-20%), usually causing Lateral Wall MI. * **Diagonal branch of LAD:** Incorrect. While branches can be involved, the main trunk of the LAD is the primary site of significant occlusion in standard epidemiological data. **High-Yield Clinical Pearls for NEET-PG:** 1. **ECG Correlation:** LAD occlusion typically presents with ST-elevation in leads **V1 to V4** (Anterior Wall MI) [2]. 2. **Septal Involvement:** Since the LAD supplies the bundle branches, an occlusion can lead to new-onset **Right Bundle Branch Block (RBBB)** or fascicular blocks. 3. **Papillary Muscle Rupture:** While more common in RCA/LCX infarcts (posteromedial muscle), LAD occlusion can occasionally cause rupture of the anterolateral papillary muscle. 4. **Order of Frequency:** LAD (45%) > RCA (35%) > LCX (15%).

Q: What is the most common type of pericarditis seen in tuberculosis?

Constrictive. **Explanation:** The correct answer is **Constrictive Pericarditis**. **Why it is correct:** Tuberculosis (TB) is the most common cause of constrictive pericarditis in developing countries. Pathologically, TB causes a chronic inflammatory response characterized by granulomatous inflammation. Over time, the healing process involves extensive **fibrosis and calcification** of the pericardium [1]. This results in a rigid, "shell-like" casing (concretio cordis) that prevents the heart from expanding during diastole, leading to the clinical features of constriction. **Why the other options are incorrect:** * **Hemorrhagic:** While TB can occasionally cause bloody effusions, hemorrhagic pericarditis is most classically associated with **malignancy** (metastatic spread) or post-cardiac surgery [1]. * **Fibrinous:** This is characterized by a "bread and butter" appearance and is most commonly seen in **Acute Myocardial Infarction** (Dressler syndrome) or Uremia. * **Serofibrinous:** This is the most common type of *acute* pericarditis overall, often seen in viral infections or Rheumatic Fever. While TB may start as a serofibrinous exudate, its hallmark and most definitive presentation in pathology exams is the progression to **constriction** [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Imaging:** Chest X-ray may show a "calcified ring" around the heart. * **Clinical Sign:** **Kussmaul’s sign** (paradoxical rise in JVP during inspiration) and a **Pericardial Knock** (early diastolic sound) are classic findings. * **Treatment:** Surgical pericardiectomy is the definitive treatment for symptomatic constrictive pericarditis. * **Gold Standard:** Cardiac catheterization showing the "Square root sign" (dip-and-plateau pattern) in ventricular pressure tracings. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 582-583.

Q: Which of the following conditions is not a single gene disorder?

Dilated cardiomyopathy. **Explanation** The correct answer is **Dilated Cardiomyopathy (DCM)**. In the context of genetic inheritance, a **single-gene (monogenic) disorder** is caused by a mutation in one specific gene. While DCM can be familial (occurring in 30-50% of cases), it is predominantly considered a **genetically heterogeneous** and often **multifactorial** condition [1]. It can be triggered by a wide array of non-genetic factors including viral myocarditis, toxins (alcohol, chemotherapy), nutritional deficiencies, and pregnancy [1]. Even when genetic, it often involves complex interactions between multiple loci or environmental triggers, unlike the classic monogenic patterns seen in the other options. **Analysis of Incorrect Options:** * **Hypertrophic Cardiomyopathy (HCM):** This is the quintessential single-gene disorder of the heart, usually inherited in an **Autosomal Dominant** pattern [2]. It is primarily a "disease of the sarcomere," commonly involving mutations in the *MYH7* or *MYBPC3* genes [2]. * **Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC):** This is a monogenic "disease of the desmosome." It is typically Autosomal Dominant, involving genes like *PKP2* (Plakophilin-2). * **Mitral Valve Prolapse (MVP):** While often sporadic, familial MVP is recognized as a monogenic trait (e.g., *DZIP1* gene) or associated with single-gene connective tissue disorders like Marfan Syndrome (*FBN1*). **NEET-PG High-Yield Pearls:** * **HCM:** Most common cause of sudden cardiac death (SCD) in young athletes. * **DCM:** The most common indication for cardiac transplantation. * **ARVC:** Characterized by fibrofatty replacement of the right ventricular myocardium; look for the **Epsilon wave** on ECG. * **Naxos Disease:** An autosomal recessive variant of ARVC associated with woolly hair and palmoplantar keratoderma (mutation in *JUP* gene).

Question 1

Vegetations on the undersurface of Aortic and Mitral (A.V.) valves are found in which condition?

Accepted Answer

Libman-Sacks endocarditis

Answer

Acute rheumatic fever

Answer

Non-bacterial thrombotic endocarditis

Answer

Chronic rheumatic carditis

Question 2

Which of the following is not seen in the early phase of myocardial infarction on microscopy?

Accepted Answer

Fibrosis

Answer

Coagulation necrosis

Answer

Edema

Answer

Hemorrhage

Question 3

A female with a history of recurrent rheumatic fever is on prophylactic penicillin therapy. Which heart valve is least commonly affected in chronic rheumatic heart disease?

Accepted Answer

Pulmonary valve

Answer

Mitral valve

Answer

Aortic valve

Answer

Tricuspid valve

Question 4

Which artery is most commonly involved in Myocardial Infarction (MI)?

Accepted Answer

Left Anterior Descending artery (LAD)

Answer

Right Coronary Artery (RCA)

Answer

Left Circumflex artery (LCX)

Answer

Diagonal branch of LAD

Question 5

Cardiac involvement in carcinoid syndrome is characterized by which of the following?

Accepted Answer

Intimal fibrosis of the right ventricle, tricuspid valve, and pulmonary valve

Answer

Calcification of the tricuspid valve

Answer

Common involvement of the major blood vessels

Answer

Equal involvement of both sides of the heart

Question 6

Which autopsy finding is characteristic after 12 hours in a case of death due to myocardial infarction?

Accepted Answer

Coagulative necrosis

Answer

Caseous necrosis

Answer

Fat necrosis

Answer

Liquefactive necrosis

Question 7

Infarcts involving which part of the myocardium cause aneurysm as a post-myocardial infarction complication?

Accepted Answer

Anterior transmural MI

Answer

Posterior transmural MI

Answer

Subendocardial MI

Answer

Inferior wall MI

Question 8

What is the characteristic cardiac lesion in SLE?

Accepted Answer

Verrucous endocarditis

Answer

Pericarditis

Answer

Myocardial fibrosis

Answer

Valvular incompetence

Question 9

What is the most common type of pericarditis seen in tuberculosis?

Accepted Answer

Constrictive

Answer

Hemorrhagic

Answer

Fibrinous

Answer

Serofibrinous

Question 10

Which of the following conditions is not a single gene disorder?

Accepted Answer

Dilated cardiomyopathy

Answer

Arrhythmogenic right ventricular cardiomyopathy

Answer

Hypertrophic cardiomyopathy

Answer

Mitral valve prolapse

Cardiac Pathology — MCQs

Cardiac Pathology — MCQs

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