# Let's Test Your Cardiac Knowledge With This Quiz

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Quizzes Created: 7 | Total Attempts: 34,879
Questions: 20 | Attempts: 1,235

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• 1.

### What is the equation for sensitivity?

• A.

Predictive value of a positive test or predictive value of a negative test

• B.

CK-MB peak at 24 hours/Troponin peaks at 3 day

• C.

True positives/(True positives + False negatives) x100True positives /(Total number of diseased patients)

• D.

All of the above

C. True positives/(True positives + False negatives) x100True positives /(Total number of diseased patients)
Explanation
The equation for sensitivity is calculated by dividing the number of true positives by the sum of true positives and false negatives, and then multiplying the result by 100. This equation represents the proportion of actual positive cases that are correctly identified as positive by a test. It is a measure of the test's ability to correctly identify individuals with the condition or disease.

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• 2.

### How many hours do troponin begin to rise?

• A.

1 HOUR

• B.

2 HOURS

• C.

4 HOURS

• D.

8 HOURS

C. 4 HOURS
Explanation
Troponin is a protein that is released into the bloodstream when there is damage to the heart muscle. It is a marker used to diagnose heart attacks. The question is asking how long it takes for troponin levels to begin to rise after a heart attack. The correct answer is 4 hours, meaning that within 4 hours of a heart attack, troponin levels in the blood will start to increase. This is an important time frame to consider when diagnosing and treating patients with suspected heart attacks.

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• 3.

### How long do the cTNI concentrations stay elevated?

• A.

24 HOURS

• B.

1 DAY

• C.

3 DAYS

• D.

9 DAYS

D. 9 DAYS
Explanation
The correct answer is 9 DAYS. This suggests that cTNI concentrations stay elevated for a period of 9 days. This could indicate a prolonged release of cardiac troponin I, which is a protein released into the bloodstream after damage to the heart muscle. Elevated cTNI levels can be indicative of a heart attack or other cardiac conditions. The prolonged elevation of cTNI levels for 9 days suggests a significant and potentially serious cardiac event.

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• 4.

### Troponin is normally detected in the bloodstream?

• A.

True

• B.

False

B. False
Explanation
Troponin is not normally detected in the bloodstream. Troponin is a protein that is found in cardiac muscle cells and is released into the bloodstream when there is damage to the heart muscle, such as during a heart attack. Therefore, the presence of troponin in the bloodstream indicates cardiac injury or damage, rather than being a normal occurrence.

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• 5.

### What are the two different polypeptide chains for CK?

• A.

M,B

• B.

C,B

• C.

T,B

• D.

P,D

A. M,B
Explanation
The correct answer is M,B. This suggests that CK (Creatine Kinase) is composed of two different polypeptide chains, one being M and the other being B. The presence of these two chains indicates that CK is a heterodimeric protein, consisting of two different subunits.

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• 6.

### CK-MB in normal individual is less than what percent of total CK?

• A.

• B.

• C.

• D.

>3%

C.
Explanation
The correct answer is 3%. CK-MB is a specific form of creatine kinase that is found mainly in the heart muscle. In a normal individual, the CK-MB level is expected to be less than 3% of the total CK level. This is because CK-MB is only a small fraction of the total creatine kinase, which includes other forms like CK-MM (found in skeletal muscle) and CK-BB (found in the brain). Therefore, a CK-MB level less than 3% is considered within the normal range.

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• 7.

### CK-MB can not be used in neonates.

• A.

True

• B.

False

A. True
Explanation
CK-MB, also known as creatine kinase-MB, is an enzyme that is used as a marker for heart muscle damage. However, it is not reliable in neonates, which are newborn infants. This is because the levels of CK-MB in neonates can be elevated due to various factors unrelated to heart muscle damage, such as birth trauma or muscle breakdown. Therefore, CK-MB cannot be used as a reliable indicator of heart muscle damage in neonates.

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• 8.

### Myolglobin rises how soon after onset of AMI?

• A.

8 hours

• B.

6 hours

• C.

4 hours

• D.

2 hours

D. 2 hours
Explanation
Myoglobin is a protein found in muscle tissue and is released into the bloodstream when there is muscle damage. In the case of an acute myocardial infarction (AMI), also known as a heart attack, the heart muscle is damaged. Therefore, myoglobin levels start to rise in the bloodstream as early as 2 hours after the onset of an AMI. This early rise in myoglobin levels can be helpful in diagnosing a heart attack quickly.

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• 9.

### Which marker is the first to rise after AMI?

• A.

Troponin

• B.

Myoglobin

• C.

CK

• D.

CK-MB

B. Myoglobin
Explanation
Myoglobin is the first marker to rise after an acute myocardial infarction (AMI) because it is a small, oxygen-binding protein found in cardiac muscle. When there is damage to cardiac muscle cells during an AMI, myoglobin is released into the bloodstream. It can be detected in the blood within hours of the onset of symptoms, making it an early indicator of myocardial injury. Troponin, CK, and CK-MB are also markers used to diagnose AMI, but myoglobin is the first to rise.

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• 10.

### When does CK-MB peak?

• A.

24 hours

• B.

36 hours

• C.

2 hours

• D.

4 hours

A. 24 hours
Explanation
CK-MB refers to creatine kinase MB, which is an enzyme found predominantly in the heart muscle. It is released into the bloodstream following a myocardial infarction (heart attack). The CK-MB levels start to rise within a few hours after the onset of a heart attack and typically peak around 24 hours. After the peak, the levels gradually decrease over the next few days. Therefore, the correct answer is 24 hours.

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• 11.

### When does troponin peak?

• A.

24 hours

• B.

1 day

• C.

2 days

• D.

3 days

D. 3 days
Explanation
Troponin is a protein released into the bloodstream when there is damage to the heart muscle. It is commonly used as a marker to diagnose heart attacks. Troponin levels typically start to rise within a few hours after a heart attack and peak around 24-48 hours. However, in some cases, it may take up to 3 days for troponin levels to reach their peak. Therefore, the correct answer is 3 days.

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• 12.

### When troponin is elevated, CK-MB help distinguish what?

• A.

When the AMI took place

• B.

How much cardiac damage there is

• C.

Whether there is renal damage

A. When the AMI took place
Explanation
When troponin levels are elevated, CK-MB can help distinguish when the acute myocardial infarction (AMI) took place. CK-MB is an enzyme that is released into the bloodstream after a heart attack. By measuring the levels of CK-MB, healthcare professionals can determine the timing of the AMI, which is crucial for determining the appropriate treatment and interventions for the patient.

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• 13.

### How long do CK-MB stay elevated for?

• A.

24-48 hours

• B.

7 days

• C.

48-72 hours

• D.

1 week

C. 48-72 hours
Explanation
CK-MB is an enzyme that is released into the bloodstream after a heart attack. The levels of CK-MB in the blood typically start to rise within a few hours of a heart attack and reach their peak within 24 to 48 hours. After reaching the peak, the levels gradually decrease over the next 48 to 72 hours. Therefore, CK-MB levels stay elevated for 48 to 72 hours after a heart attack.

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• 14.

### Which biomarker can detect minor myocardial damage and microinfarction?

• A.

Myoglobin

• B.

CK-MB

• C.

Troponin

C. Troponin
Explanation
Troponin is a biomarker that can detect minor myocardial damage and microinfarction. Troponin is a protein found in cardiac muscle cells, and its levels in the blood increase when there is damage to the heart muscle. It is a highly sensitive and specific marker for myocardial injury, making it an important tool in diagnosing and monitoring heart conditions such as myocardial infarction. Myoglobin and CK-MB are also biomarkers used in diagnosing heart conditions, but they are less specific and sensitive compared to troponin.

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• 15.

### What is the most sensitive and specific marker available today for AMI?

• A.

CKMB

• B.

Myoglobin

• C.

CK

• D.

Troponin

D. Troponin
Explanation
Troponin is the most sensitive and specific marker available today for Acute Myocardial Infarction (AMI). Troponin is a protein found in cardiac muscle cells, and its presence in the bloodstream indicates damage to the heart muscle. It is highly specific to cardiac tissue, making it a reliable marker for diagnosing AMI. Additionally, troponin levels rise within a few hours of the onset of symptoms, allowing for early detection of a heart attack. Other markers like CKMB, myoglobin, and CK may also be elevated in AMI, but troponin is considered the gold standard due to its superior sensitivity and specificity.

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• 16.

### What is a marker for heart failure?

• A.

Myoglobin

• B.

Troponin

• C.

BNP

• D.

CKMB

C. BNP
Explanation
BNP, or B-type natriuretic peptide, is a marker for heart failure. It is a hormone released by the heart in response to increased pressure and stretching of heart muscle cells. Elevated levels of BNP in the blood indicate the presence of heart failure. BNP levels can help diagnose and monitor the severity of heart failure, as well as guide treatment decisions. Other markers such as myoglobin, troponin, and CKMB are not specific to heart failure and are used for diagnosing other conditions such as myocardial infarction.

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• 17.

### BNP greater than >400 could mean CHF.

• A.

True

• B.

False

A. True
Explanation
A BNP (B-type natriuretic peptide) level greater than 400 can indicate congestive heart failure (CHF). BNP is a hormone released by the heart when it is under stress or strain, and elevated levels suggest the presence of heart failure. Therefore, it is true that a BNP level greater than 400 could indicate CHF.

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• 18.

### A rise in BNP is correlated with a decrease in what function?

• A.

Right ventricular ejection fraction

• B.

Lower ventricular ejection fraction

• C.

Upper ventricular ejection fraction

• D.

Left ventricular ejection fraction

D. Left ventricular ejection fraction
Explanation
An increase in BNP levels is associated with a decrease in left ventricular ejection fraction. B-type natriuretic peptide (BNP) is released by the ventricles of the heart in response to increased pressure and volume overload. It acts as a marker for heart failure and is used to assess cardiac function. A rise in BNP indicates impaired left ventricular function, which leads to a decrease in the left ventricular ejection fraction. This means that the heart is not effectively pumping blood out of the left ventricle, resulting in a decrease in the amount of blood ejected with each contraction.

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• 19.

### The likelihood that a test will give a negative result when the disease is absent is termed specificity

• A.

True

• B.

False

A. True
Explanation
The explanation for the given correct answer is that specificity refers to the ability of a test to correctly identify individuals without the disease as negative. In other words, it measures the likelihood of a test giving a negative result when the disease is actually absent. Therefore, the statement that "the likelihood that a test will give a negative result when the disease is absent is termed specificity" is true.

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• Current Version
• Mar 20, 2023
Quiz Edited by
ProProfs Editorial Team
• Mar 03, 2015
Quiz Created by
Lveal

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