Sem1mini3 - ECG MCQ

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  • 1/7 Questions

    The T Wave on an EKG represents:

    • Ventricular Depolarization
    • Ventricular Repolarization
    • Atrial Depolarization
    • Atrial Repolarization
    • Ventricular Systole
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Sem1mini3 - ECG MCQ - Quiz
About This Quiz

Sem1Mini3 - ECG MCQ explores key aspects of electrocardiography including heart rate analysis, QT and PR intervals, ventricular action potentials, and effects of AV node blockages. It's designed to enhance diagnostic skills in interpreting ECGs, crucial for medical professionals.

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  • 2. 
    The following image is an ECG trace from Lead I. Determine if the heart rate and duration of the PR interval and QT interval are within the normal ranges. Heart rate PR interval QT interval - ProProfs

    The following image is an ECG trace from Lead I. Determine if the heart rate and duration of the PR interval and QT interval are within the normal ranges. Heart rate PR interval QT interval

    • Normal Normal Normal

    • Normal Greater than normal Normal

    • Normal Normal Greater than normal

    • Bradycardia Normal Less than normal

    • Bradycardia Greater than normal Less than normal

    • Bradycardia Less than normal Normal

    Correct Answer
    A. Normal Normal Normal
    Explanation
    The heart rate, PR interval, and QT interval are all within the normal ranges.

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  • 3. 
    Choose the answer choice below which most closely represents the heart rate of the ECG trace shown. - ProProfs

    Choose the answer choice below which most closely represents the heart rate of the ECG trace shown.

    • 300 beats per minute

    • 150 beats per minute

    • 100 beats per minute

    • 75 beats per minute

    • 60 beats per minute

    Correct Answer
    A. 150 beats per minute
    Explanation
    The ECG trace shown indicates a regular and consistent pattern of peaks and valleys. By counting the number of peaks within a minute, we can determine the heart rate. In this case, there are approximately 150 peaks, indicating a heart rate of 150 beats per minute.

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  • 4. 

    What electrical event of the heart is NOT recorded on the standard 12-lead ECG trace?

    • Atrial depolarization

    • Atrial repolarization

    • Phase 2 of the ventricular action potential

    • Ventricular repolarization

    • Phase 4 of the ventricular action potential

    Correct Answer
    A. Atrial repolarization
    Explanation
    Atrial repolarization is not recorded on the standard 12-lead ECG trace. This is because the electrical activity associated with atrial repolarization is masked by the much larger QRS complex, which represents the depolarization of the ventricles. The P wave on the ECG trace represents atrial depolarization, and the T wave represents ventricular repolarization. Phase 2 and phase 4 of the ventricular action potential are also represented on the ECG trace.

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  • 5. 

    If there is a blockage between the AV node and the AV bundle, how will this affect the appearance of the EKG?

    • PR interval would be smaller

    • QRS interval would be shorter

    • There would be more P waves than QRS complexes

    • There would be more QRS complexes than P waves

    • The T wave would be absent

    Correct Answer
    A. There would be more P waves than QRS complexes
    Explanation
    If there is a blockage between the AV node and the AV bundle, it means that the electrical signals from the atria are unable to pass through to the ventricles. This would result in the atria continuing to generate their own electrical signals, causing more P waves to appear on the EKG. However, since the signals are not reaching the ventricles, there would be fewer QRS complexes, which represent ventricular depolarization. Therefore, the correct answer is that there would be more P waves than QRS complexes.

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  • 6. 
    The normal direction of the QRS complex in lead aVR results from the - ProProfs

    The normal direction of the QRS complex in lead aVR results from the

    • Repolarization of the ventricular endocardial surface before the epicardial surface.

    • Depolarization of the ventricular septum before the left ventricular wall

    • Conduction delay caused by the AV-node

    • Wave of depolarization moving away from the positive electrode.

    • Depolarization of the right ventricle before the left ventricle.

    Correct Answer
    A. Wave of depolarization moving away from the positive electrode.
    Explanation
    The normal direction of the QRS complex in lead aVR is opposite to the direction of the QRS complex in the other leads. This is because lead aVR is placed on the right arm, which is in a position opposite to the other limb leads. Therefore, the wave of depolarization in lead aVR moves away from the positive electrode, resulting in an inverted QRS complex.

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  • 7. 

    The figure below shows a ventricular action potential.  Which of the numbered portions of the action potential most closely corresponds to the ST-segment on an ECG trace?

    • 1

    • 2

    • 3

    • 4

    • 5

    Correct Answer
    A. 3
    Explanation
    The ST-segment on an ECG trace represents the plateau phase of the ventricular action potential, which is when the ventricles are contracting and pumping blood. In the given figure, portion 3 closely corresponds to the ST-segment because it represents the plateau phase, where the membrane potential remains stable before repolarization occurs.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 07, 2011
    Quiz Created by
    BLACKMD
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