Cardiovascular Disease and Biochemical Markers MCQs | MCQ Quiz | OmpathStudy Kenya

Question 1

A 55-year-old male presents to the emergency department with severe crushing chest pain radiating to his left arm and jaw, accompanied by cold sweats. Which cardiac biomarker is considered the gold standard for diagnosing his condition?

Accepted Answer

Troponin I — Troponin I is the gold standard for diagnosing myocardial infarction due to its high specificity to cardiac muscle injury. It can remain elevated for several days, aiding in diagnosis of recent heart attacks.

Question 2

A patient with suspected heart failure presents with dyspnea. Which biomarker would be MOST useful in differentiating between cardiac and non-cardiac causes of shortness of breath?

Accepted Answer

B-type Natriuretic Peptide (BNP) — BNP is produced by the heart in response to increased pressure and volume, making it particularly useful in differentiating between cardiac and non-cardiac causes of dyspnea and diagnosing heart failure.

Question 3

Which cardiac biomarker has the SHORTEST time to return to normal levels after myocardial infarction?

Accepted Answer

CK-MB — CK-MB typically returns to normal within a few days after myocardial infarction, helping determine the timing of myocardial injury. Troponins remain elevated for several days longer.

Question 4

A 60-year-old woman presents 2 hours after onset of chest pain. Which cardiac biomarker would be elevated EARLIEST?

Accepted Answer

Myoglobin — Myoglobin rises within hours of myocardial injury and is the earliest marker of heart attack, though it is less specific than troponins and is typically used alongside other markers for early detection.

Question 5

What is the underlying pathophysiology of coronary artery disease?

Accepted Answer

Atherosclerosis causing plaque buildup in coronary arteries — Coronary artery disease is caused by atherosclerosis, which involves the buildup of plaque in the heart's major blood vessels, leading to damage or disease in these arteries.

Question 6

Which clinical feature is characteristic of intermittent claudication in peripheral artery disease?

Accepted Answer

Pain and cramping in legs during activity that resolves with rest — Intermittent claudication is a classic feature of PAD characterized by pain, cramping, or weakness in the legs during physical activity, which resolves with rest due to inadequate blood flow during exercise.

Question 7

A patient presents with sudden numbness on the right side of the face, arm weakness, and difficulty speaking. What is the MOST likely diagnosis?

Accepted Answer

Stroke — Sudden numbness or weakness on one side of the body, difficulty speaking, and confusion are classic signs of stroke, which results from interrupted blood supply to the brain.

Question 8

Which diagnostic test records the electrical activity of the heart and can identify ischemia, arrhythmias, or previous heart attacks?

Accepted Answer

Electrocardiogram (ECG) — An ECG records the heart's electrical activity and is fundamental in identifying ischemia, arrhythmias, and characteristic changes associated with heart attacks or previous myocardial infarction.

Question 9

What is the primary advantage of NT-proBNP over BNP in diagnosing heart failure?

Accepted Answer

Longer half-life providing extended detection window — NT-proBNP has a longer half-life than BNP, providing a more extended window for detection and helping assess the severity of heart failure and monitor treatment effectiveness.

Question 10

A 45-year-old asymptomatic patient is found to have consistently elevated blood pressure readings over several visits. What is the MOST likely diagnosis?

Accepted Answer

Essential hypertension — Hypertension is often asymptomatic and is confirmed by consistently high blood pressure readings over multiple visits. Many people with high blood pressure do not experience symptoms.

Question 11

Which imaging technique uses contrast dye and X-rays to visualize coronary arteries and identify blockages?

Accepted Answer

Coronary angiography — Coronary angiography is an invasive imaging technique that uses contrast dye and X-rays to directly visualize the coronary arteries and identify blockages or narrowing.

Question 12

A patient with heart failure presents with bilateral ankle edema, shortness of breath when lying flat, and fatigue. What mechanism explains the edema?

Accepted Answer

Fluid retention due to inadequate cardiac pumping — In heart failure, the heart cannot pump effectively, leading to fluid retention and accumulation in dependent areas like the legs, ankles, and abdomen, causing edema.

Question 13

Which test evaluates the heart's performance under physical stress to diagnose coronary artery disease?

Accepted Answer

Stress test — A stress test evaluates the heart's performance under physical stress or with medication to simulate exercise, helping diagnose coronary artery disease by revealing ischemia that may not be apparent at rest.

Question 14

What is the clinical significance of elevated high-sensitivity C-reactive protein (hs-CRP)?

Accepted Answer

Assesses inflammation and cardiovascular risk — hs-CRP is an inflammatory marker that helps assess inflammation levels associated with increased cardiovascular risk. It is used to evaluate overall cardiovascular risk rather than diagnose specific acute conditions.

Question 15

A patient undergoes an ankle-brachial index (ABI) test. What condition is being evaluated?

Accepted Answer

Peripheral artery disease — The ankle-brachial index compares blood pressure in the ankle and arm to detect arterial blockages in peripheral arteries, making it a key diagnostic tool for peripheral artery disease.

Question 16

Which cardiac biomarker is an isoenzyme of creatine kinase found predominantly in heart muscle?

Accepted Answer

CK-MB — CK-MB is an isoenzyme of creatine kinase found predominantly in heart muscle. Elevated levels suggest myocardial damage and it is used with troponins to diagnose myocardial infarction.

Question 17

What is the primary limitation of myoglobin as a cardiac biomarker?

Accepted Answer

Low specificity - released from any damaged muscle tissue — Myoglobin is less specific than troponins because it is released from any damaged muscle tissue, not just cardiac muscle, making it necessary to use it alongside other more specific markers.

Question 18

A patient with atrial fibrillation experiences palpitations and dizziness. Which diagnostic test would provide continuous recording for 24 hours to capture the arrhythmia?

Accepted Answer

Holter monitor — A Holter monitor provides continuous 24-hour ECG recording, making it ideal for detecting and documenting intermittent arrhythmias like atrial fibrillation that may not be present during a standard ECG.

Question 19

Which imaging study is MOST appropriate for distinguishing between ischemic and hemorrhagic stroke?

Accepted Answer

CT or MRI of the brain — CT or MRI of the brain identifies brain tissue damage and is essential for distinguishing between ischemic stroke (caused by blockage) and hemorrhagic stroke (caused by bleeding), guiding treatment decisions.

Question 20

What is the primary function of an echocardiogram in evaluating heart failure?

Accepted Answer

Assessing heart function including ejection fraction — An echocardiogram uses ultrasound to create images of the heart's structure and function, including assessment of ejection fraction and structural abnormalities, making it crucial for diagnosing and managing heart failure.

Question 21

A 50-year-old diabetic smoker with a family history of heart disease is being assessed for cardiovascular risk. Which factor is being evaluated?

Accepted Answer

Modifiable and non-modifiable risk factors — Cardiovascular risk assessment includes evaluating both modifiable risk factors (smoking, diabetes) and non-modifiable risk factors (family history, age) that contribute to CVD development.

Question 22

Which clinical feature would differentiate a heart attack from stable angina?

Accepted Answer

Sudden, intense crushing chest pain with associated symptoms — Heart attack presents with sudden, intense crushing or squeezing chest pain, often accompanied by sweating, nausea, and shortness of breath, unlike stable angina which is typically relieved by rest.

Question 23

What is the clinical significance of elevated homocysteine levels?

Accepted Answer

Associated with increased cardiovascular disease risk — Elevated homocysteine, an amino acid, is associated with increased risk of cardiovascular disease, though its role in routine cardiovascular risk assessment is less established than other markers.

Question 24

A patient with severe hypertension may experience which of the following symptoms?

Accepted Answer

Headaches, dizziness, nosebleeds, or blurred vision — While hypertension is often asymptomatic, severe hypertension can cause headaches, dizziness, nosebleeds, or blurred vision, particularly when blood pressure is extremely high.

Question 25

Which test uses ultrasound to measure blood flow and detect blockages in peripheral arteries?

Accepted Answer

Doppler ultrasound — Doppler ultrasound measures blood flow and detects blockages or narrowing in peripheral arteries, making it a key non-invasive diagnostic tool for peripheral artery disease.

Question 26

What is the primary difference between necrosis markers (troponins) and heart failure markers (BNP)?

Accepted Answer

Troponins indicate muscle damage; BNP indicates pressure/volume overload — Troponins indicate cardiac muscle damage (necrosis) and are used for diagnosing myocardial infarction, while BNP indicates pressure and volume overload and is used for diagnosing heart failure.

Question 27

A patient presents with slow-healing sores on the feet and cold legs compared to the rest of the body. What is the MOST likely diagnosis?

Accepted Answer

Peripheral artery disease — Slow-healing or non-healing sores on feet or legs, along with cold extremities, are characteristic features of peripheral artery disease due to inadequate blood flow to the lower extremities.

Question 28

Which enzyme is associated with inflammation and atherosclerosis and used to assess cardiovascular disease risk?

Accepted Answer

Lipoprotein-associated Phospholipase A2 (Lp-PLA2) — Lp-PLA2 is an enzyme associated with inflammation and atherosclerosis, used to assess cardiovascular disease risk particularly in patients with stable coronary artery disease.

Question 29

What is the advantage of using troponins over CK-MB in diagnosing myocardial infarction?

Accepted Answer

Troponins are more specific to cardiac muscle — Troponins are highly specific to cardiac muscle injury, making them the gold standard for diagnosing myocardial infarction, whereas CK-MB can be less specific.

Question 30

A patient experiences fainting episodes. Which cardiovascular condition could explain this symptom?

Accepted Answer

Significant arrhythmias — Syncope (fainting) can occur with significant arrhythmias due to inadequate blood flow to the brain caused by abnormal heart rhythms affecting cardiac output.

Question 31

What is the purpose of ambulatory blood pressure monitoring over 24 hours?

Accepted Answer

Assess blood pressure variability and accuracy over time — Ambulatory blood pressure monitoring measures blood pressure at regular intervals over 24 hours to assess variability, accuracy, and patterns throughout day and night.

Question 32

Which condition is characterized by the heart's inability to pump effectively to meet the body's needs?

Accepted Answer

Heart failure — Heart failure is specifically defined as a condition where the heart is unable to pump effectively to meet the body's metabolic needs.

Question 33

A patient with heart failure experiences worsening shortness of breath when lying flat. What is this symptom called?

Accepted Answer

Orthopnea — Orthopnea is shortness of breath that occurs or worsens when lying flat, a classic symptom of heart failure due to increased venous return and pulmonary congestion.

Question 34

Which non-invasive imaging technique can visualize coronary artery anatomy and detect blockages without catheterization?

Accepted Answer

CT coronary angiography — CT coronary angiography is a non-invasive imaging technique that can visualize coronary artery anatomy and detect blockages, providing an alternative to invasive coronary angiography.

Question 35

What is the clinical significance of a prolonged QT interval on ECG?

Accepted Answer

Suggests risk for dangerous arrhythmias — A prolonged QT interval on ECG suggests an increased risk for dangerous ventricular arrhythmias.

Question 36

Which cardiac condition is often associated with coughing or wheezing, particularly when lying down or at night?

Accepted Answer

Heart failure — Heart failure can cause coughing or wheezing, particularly when lying down or at night, due to fluid accumulation in the lungs (pulmonary congestion).

Question 37

Which test evaluates blood flow in the carotid arteries and detects plaque buildup?

Accepted Answer

Carotid ultrasound — Carotid ultrasound evaluates blood flow in the carotid arteries and detects plaque buildup, helping assess stroke risk.

Question 38

A patient presents with palpitations described as a sensation of rapid or irregular heartbeat. Which diagnostic test would be MOST appropriate initially?

Accepted Answer

ECG — ECG is the initial and most appropriate test for evaluating palpitations as it can detect abnormal heart rhythms and arrhythmias in real-time.

Cardiovascular Disease and Biochemical Markers MCQs | MCQ Quiz | OmpathStudy Kenya

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