Ischemic Heart Disease — MCQs
A 45-year-old man presents with intermittent pain in the chest, radiating to the left arm, aggravated by exertion, and relieved by rest. What is the most appropriate initial investigation?
What type of necrosis is associated with Myocardial Infarction (MI)?
The cells seen after 72 hours in the infarcted area in myocardial infarction are
Which of the following is not true about atherosclerosis?
Dense collagen deposition replacing inflammatory infiltrate and debris in myocardial tissue is characteristically seen at what duration following myocardial infarction?
Which of the following studies has given coronary risk factors?
What is the histopathological finding 12 hours after ischemic injury to heart?
Which of the following is NOT a risk factor for atherosclerosis?
A 55-year-old male, known smoker, complains of calf pain while walking. He experiences calf pain while walking but can continue walking with effort. Which grade of claudication does this patient fall under?
A concept directed against the development of risk factors of coronary artery disease is -
Ischemic Heart Disease Indian Medical PG Practice Questions and MCQs
Question 1: A 45-year-old man presents with intermittent pain in the chest, radiating to the left arm, aggravated by exertion, and relieved by rest. What is the most appropriate initial investigation?
- A. Chest X-ray
- B. Cardiac enzymes
- C. ECG (Correct Answer)
- D. Echocardiogram
Explanation: ***ECG*** - An **ECG** is the most appropriate initial investigation for suspected **angina pectoris** due to its rapid availability and ability to detect signs of **myocardial ischemia** or infarction [1]. - It can reveal changes such as **ST-segment depression** or elevation, **T-wave inversion**, or pathological Q waves [1]. *Chest X-ray* - A **chest X-ray** is useful for evaluating conditions like **pneumonia**, **pneumothorax**, or **heart failure** (cardiomegaly, pulmonary edema). - It is generally not the first-line diagnostic tool for **ischemic heart disease** as it cannot directly visualize coronary arteries or myocardial ischemia. *Cardiac enzymes* - **Cardiac enzymes** (e.g., troponin, CK-MB) are crucial for diagnosing **acute myocardial infarction** but are typically elevated hours after the onset of chest pain. - While important for confirming an MI, they are not the *initial* investigation for transient, exertion-related chest pain suggestive of **stable angina** [1]. *Echocardiogram* - An **echocardiogram** provides detailed information about **cardiac structure** and function, including **wall motion abnormalities**, valve function, and overall ejection fraction [1]. - While valuable, it is usually performed after an ECG to further evaluate the heart's pumping ability and identify **regional wall motion abnormalities** indicative of ischemia, rather than as the very first step [1].
Question 2: What type of necrosis is associated with Myocardial Infarction (MI)?
- A. Coagulative necrosis (Correct Answer)
- B. Liquefactive necrosis
- C. Caseous necrosis
- D. Fat necrosis
Explanation: ***Coagulative necrosis*** - Myocardial infarction (MI) typically results in **coagulative necrosis**, characterized by the preservation of the outline of the tissue despite cellular death [1]. - It is often associated with **ischemia**, where blood supply is obstructed, leading to cell death while maintaining tissue architecture for a time [1]. *Fat necrosis* - Fat necrosis is typically associated with **trauma** or **inflammation** in fat tissue, often seen in conditions like pancreatitis. - It is characterized by the presence of **necrotic adipocytes** and does not involve the myocardium directly or predominantly. *Caseous necrosis* - Caseous necrosis is often associated with **tuberculosis** infections, where tissue becomes crumbly and cheese-like. - It is not relevant to myocardial infarction, which does not present with the classical **granulomatous inflammation** of caseous necrosis. *Liquefactive necrosis* - Liquefactive necrosis typically occurs in conditions such as **brain infarcts** or bacterial infections leading to **pus formation**, not in MI. - It involves the transformation of tissue into a **liquid viscous mass**, which is not characteristic of myocardial tissue affected by infarction. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552.
Question 3: The cells seen after 72 hours in the infarcted area in myocardial infarction are
- A. Neutrophils
- B. Lymphocytes
- C. Macrophages (Correct Answer)
- D. Monocytes
Explanation: ***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.
Question 4: Which of the following is not true about atherosclerosis?
- A. Deposition of lipids on vessels
- B. It is an inflammatory response to endothelial injury
- C. Always involves small arterioles (Correct Answer)
- D. Necrosis of Vessels
Explanation: ***Does not involve small arterioles*** - Atherosclerosis predominantly affects **large and medium-sized arteries** [1], especially the **aorta**, coronary, and carotid arteries. - Small arterioles are generally not involved; instead, they are more affected in conditions like **hyaline arteriolosclerosis** [2]. *Deposition of lipids on vessels* - This option is true; atherosclerosis involves **accumulation of lipids** in the arterial wall [3][4], including cholesterol. - The buildup of lipids leads to **plaque formation** [3], causing narrowing and potential occlusion of the artery. *It is an inflammatory response to endothelial injury* - This statement is accurate; atherosclerosis is driven by **endothelial injury**, leading to an inflammatory response [3]. - Events such as **oxidation of LDL** and recruitment of inflammatory cells play crucial roles in the pathogenesis. *Necrosis of Vessels* - This option is misleading; while atherosclerosis can lead to ischemia and cell death, it is not primarily characterized by **necrosis of vessels** itself. - Rather, it results from **luminal narrowing** and plaque rupture, not direct tissue necrosis in the arterial wall. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 507-508. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 498-499. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 268-270. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 504-505.
Question 5: Dense collagen deposition replacing inflammatory infiltrate and debris in myocardial tissue is characteristically seen at what duration following myocardial infarction?
- A. Immediate MI
- B. 2 days
- C. 2 weeks (Correct Answer)
- D. Postmortem infarct effect
Explanation: ***2 weeks*** - At **2 weeks** post-myocardial infarction, gross changes include the presence of granulation tissue and **neovascularization**, indicating healing [1]. - Viable cardiac muscle can often be observed, along with ongoing inflammatory response and gradual replacement of necrotic tissue [1]. *Immediate MI* - During the **immediate phase**, the myocardium shows early signs of necrosis with no significant healing or granulation tissue formation yet [1]. - Changes such as **pallor** of the myocardium can be seen, but gross changes indicating structural recovery are not present [1]. *Postmortem infarct aefact* - This term relates to changes observed after death; it's not a valid timeframe regarding acute infarction recovery. - This option lacks relevance to the healing process following **myocardial infarction**. *2 days* - At **2 days**, the myocardium primarily exhibits **coagulative necrosis**, without significant signs of healing like granulation tissue [1]. - Inflammatory changes are present, but gross tissue appearance is still largely characterized by necrosis and not recovery [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552.
Question 6: Which of the following studies has given coronary risk factors?
- A. Framingham (Correct Answer)
- B. Stanford study
- C. MONICA
- D. North Karelia
Explanation: ***Framingham*** - The **Framingham Heart Study** is a landmark prospective cohort study that has identified many of the well-known **risk factors for cardiovascular disease**, including hypertension, high cholesterol, smoking, and diabetes. - This ongoing study, started in 1948, has been instrumental in shaping our understanding of **coronary artery disease** development and prevention strategies. *North Karelia* - The **North Karelia Project** was a comprehensive community-based prevention program in Finland that successfully reduced cardiovascular disease risk factors. - While influential in demonstrating how to **implement prevention strategies**, it applied already-known risk factors rather than discovering new ones. - The program focused on reducing smoking, cholesterol, and blood pressure in the population. *Stanford study* - While Stanford University has conducted numerous influential medical studies, there isn't a single "Stanford study" primarily recognized for giving us the comprehensive list of coronary risk factors. - Many institutions contribute to medical knowledge, but the **Framingham Heart Study** stands out for this specific contribution. *MONICA* - The **MONICA (Monitoring Trends and Determinants in Cardiovascular Disease)** Project was a multinational WHO project that aimed to monitor cardiovascular disease trends and determinants. - While it provided valuable data on the **epidemiology of cardiovascular disease** and its risk factors, it primarily assessed trends in established risk factors rather than initially identifying them.
Question 7: What is the histopathological finding 12 hours after ischemic injury to heart?
- A. Neocapillary invasion of myocytes
- B. Hyper-eosinophilia of myocytes (Correct Answer)
- C. Karyorrhexis of myocytes
- D. Coagulation necrosis of myocytes
Explanation: ***Hyper-eosinophilia of myocytes*** - Within **4-12 hours** of myocardial ischemia, the most characteristic histological finding is the development of **hypereosinophilia** in the sarcoplasm of myocardial cells [1]. - This is due to the loss of **glycogen** and an increase in **cytoplasmic protein binding** to eosin, indicating early irreversible cell injury [1], [2]. *Neocapillary invasion of myocytes* - **Neocapillary invasion** is a feature of **healing** and **repair** processes, usually observed much later, typically days to weeks after the initial injury, to facilitate scar formation [1]. - This process involves the growth of **new blood vessels** into the damaged tissue. *Karyorrhexis of myocytes* - **Karyorrhexis**, the fragmentation of the cell nucleus, is a later stage of necrosis, usually becoming apparent **12-24 hours post-infarction** [1]. - In the initial 12 hours, nuclear changes like **pyknosis** (nuclear shrinkage and increased basophilia) might be observed, but karyorrhexis is not prominent [1]. *Coagulation necrosis of myocytes* - While myocardial infarction is characterized by **coagulation necrosis**, the classic histological signs of full-blown coagulation necrosis, such as loss of striations and nuclear changes, become prominent at **12-24 hours and beyond** [1]. - In the first 12 hours, **hypereosinophilia** is the primary early indicator of this necrotic process, preceding the more overt classical features [1]. **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 8: Which of the following is NOT a risk factor for atherosclerosis?
- A. Smoking
- B. High blood pressure
- C. High cholesterol
- D. Normal LDL cholesterol (Correct Answer)
Explanation: ***Normal LDL cholesterol*** - Maintaining **normal LDL cholesterol levels** indicates a healthy lipid profile and does not promote the accumulation of plaque in arteries, thus it is not a risk factor for atherosclerosis. - In fact, keeping LDL cholesterol within the normal range is a **protective factor** against the development and progression of atherosclerosis. *Smoking* - **Smoking** is a significant risk factor for atherosclerosis as it damages the **endothelium** (the inner lining of blood vessels), making it more susceptible to plaque formation. - It also reduces **HDL cholesterol** (good cholesterol) and increases **blood viscosity**, further contributing to arterial damage and clot formation. *High blood pressure* - **High blood pressure (hypertension)** is a major risk factor because it creates increased force against the artery walls, leading to **endothelial injury** and promoting the infiltration of lipids [1], [2]. - This chronic stress on the arterial walls accelerates the development of **atherosclerotic plaques** and stiffening of arteries [1]. *High cholesterol* - Specifically, **high levels of LDL cholesterol** (low-density lipoprotein, often referred to as "bad" cholesterol) directly contribute to atherosclerosis by depositing cholesterol within the arterial walls [3], [4]. - These deposits form **fatty streaks** that can progress into mature atherosclerotic plaques, narrowing arteries and impeding blood flow [3].
Question 9: A 55-year-old male, known smoker, complains of calf pain while walking. He experiences calf pain while walking but can continue walking with effort. Which grade of claudication does this patient fall under?
- A. Grade I (Mild claudication)
- B. Grade II (Moderate claudication) (Correct Answer)
- C. Grade III (Severe claudication)
- D. Grade IV (Ischemic rest pain)
Explanation: ***Grade II (Moderate claudication)*** - **Grade II claudication** is characterized by **intermittent claudication** where the patient experiences pain while walking but can **continue walking with effort**. - This level of claudication reflects a moderate degree of peripheral arterial disease, where blood flow is sufficiently compromised to cause pain with exertion but not severe enough to force immediate cessation of activity. - The patient in this scenario can continue ambulation despite discomfort, which is the defining feature of this grade. *Grade I (Mild claudication)* - **Grade I claudication** involves discomfort or pain that the patient can **tolerate without significantly altering their gait or pace**. - In this stage, the pain is minimal, and the patient may perceive it as a dull ache or mild fatigue rather than true pain. - Walking can continue without significant effort or limitation. *Grade III (Severe claudication)* - **Grade III claudication** is marked by pain that is **severe enough to stop the patient from walking within a short distance** (typically less than 200 meters). - The pain forces the patient to rest and recover before they can resume walking. - This represents significant functional limitation in daily activities. *Grade IV (Ischemic rest pain)* - **Grade IV**, also known as **critical limb ischemia**, involves **pain even at rest**, especially in the feet or toes, often worsening at night when the limb is elevated. - This stage indicates severe arterial obstruction and is frequently associated with **ulcers, non-healing wounds, or gangrene**. - This represents advanced peripheral arterial disease requiring urgent intervention. **Note:** This grading system is a simplified clinical classification. The standard medical classifications for peripheral arterial disease are the **Fontaine classification** (Stages I-IV) and **Rutherford classification** (Categories 0-6).
Question 10: A concept directed against the development of risk factors of coronary artery disease is -
- A. Primordial prevention (Correct Answer)
- B. Primary prevention
- C. Secondary prevention
- D. Health education
Explanation: ***Primordial prevention*** - **Primordial prevention** targets the prevention of the emergence of **risk factors** in the first place, often by addressing social, environmental, and behavioral determinants before they become established. - In the context of coronary artery disease, this would involve preventing the development of risk factors like **obesity**, **hypertension**, and **unhealthy diets** from an early age, even in populations that have not yet developed them. *Health education (general awareness and behavior change)* - While health education is a *method* used in prevention, it is not a level of prevention itself. - It contributes to various levels of prevention, including primordial and primary, by raising **awareness** and promoting **behavior change**. *Primary prevention (preventing disease onset)* - **Primary prevention** focuses on preventing the *onset* of disease in individuals who are already exposed to or have **risk factors**. - For coronary artery disease, this would include interventions like **blood pressure control** or **cholesterol management** in individuals already at risk. *Secondary prevention (early detection and management)* - **Secondary prevention** aims at early **detection** and prompt **management** of an existing disease to prevent its progression or complications. - In coronary artery disease, this would involve screening for asymptomatic heart disease or managing established CAD to prevent events like **heart attacks**.
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