Block 3 EKG Strips And Stuff

Approved & Edited by ProProfs Editorial Team

The editorial team at ProProfs Quizzes consists of a select group of subject experts, trivia writers, and quiz masters who have authored over 10,000 quizzes taken by more than 100 million users. This team includes our in-house seasoned quiz moderators and subject matter experts. Our editorial experts, spread across the world, are rigorously trained using our comprehensive guidelines to ensure that you receive the highest quality quizzes.

Learn about Our Editorial Process

| By Chachelly

Chachelly

Community Contributor

Quizzes Created: 507 | Total Attempts: 621,358

Questions: 7 | Attempts: 2,155 | Updated: Mar 22, 2023

Questions

Settings

Feedback

During the Quiz End of Quiz

Difficulty

Sequential Easy First Hard First

Play as

Quiz Flashcard

Create your own Quiz

Share on Facebook Share on Twitter Share on Whatsapp Share on Pinterest Share on Email Copy to Clipboard Embed on your website

If you want to know how to read an EKG strip you need to know certain things and how to describe the readings. Below is Block three quiz that is designed to help see just how much you understand about reading an Ekg strip. Give it a shot and see if you should hit the books a little harder before the exam.

Questions and Answers

1.

The T Wave on an EKG represents:
- A.
  
  Ventricular Depolarization
- B.
  
  Ventricular Repolarization
- C.
  
  Atrial Depolarization
- D.
  
  Atrial Repolarization
- E.
  
  Ventricular Systole
Correct Answer
B. Ventricular Repolarization

Explanation
The T wave on an EKG represents ventricular repolarization. This is the phase of the cardiac cycle where the ventricles relax and reset their electrical charge after contracting during ventricular depolarization. The T wave is a positive deflection on the EKG graph that indicates the repolarization of the ventricles. This is an important part of the cardiac cycle as it allows the heart to prepare for the next contraction.

Rate this question:
2.

Choose the answer choice below which most closely represents the heart rate of the ECG trace shown.
- A.
  
  300 beats per minute
- B.
  
  150 beats per minute
- C.
  
  100 beats per minute
- D.
  
  75 beats per minute
- E.
  
  60 beats per minute
Correct Answer
B. 150 beats per minute

Explanation
The correct answer is 150 beats per minute. This is because the ECG trace shows a regular pattern of peaks and valleys, indicating a consistent heart rate. By counting the number of peaks within a minute, it can be determined that the heart rate is approximately 150 beats per minute.

Rate this question:

1
0
3.

If there is a blockage between the AV node and the AV bundle, how will this affect the appearance of the EKG?
- A.
  
  PR interval would be smaller
- B.
  
  QRS interval would be shorter
- C.
  
  There would be more P waves than QRS complexes
- D.
  
  There would be more QRS complexes than P waves
- E.
  
  The T wave would be absent
Correct Answer
C. 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 signal from the atria is unable to pass through to the ventricles. As a result, the atria will continue to generate their own electrical signals, causing more P waves to appear on the EKG. However, since the signal is unable to reach the ventricles, there will be fewer QRS complexes, which represent ventricular depolarization. Therefore, the correct answer is that there would be more P waves than QRS complexes.

Rate this question:
4.

The normal direction of the QRS complex in lead aVR results from the
- A.
  
  Repolarization of the ventricular endocardial surface before the epicardial surface.
- B.
  
  Depolarization of the ventricular septum before the left ventricular wall
- C.
  
  Conduction delay caused by the AV-node
- D.
  
  Wave of depolarization moving away from the positive electrode.
- E.
  
  Depolarization of the right ventricle before the left ventricle.
Correct Answer
D. 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 limb leads. This is because lead aVR is a unipolar lead that is oriented towards the right arm, which acts as the positive electrode. Therefore, the QRS complex in lead aVR represents a wave of depolarization moving away from the positive electrode, resulting in a negative deflection.

Rate this question:
5.

What electrical event of the heart is NOT recorded on the standard 12-lead ECG trace?
- A.
  
  Atrial depolarization
- B.
  
  Atrial repolarization
- C.
  
  Phase 2 of the ventricular action potential
- D.
  
  Ventricular repolarization
- E.
  
  Phase 4 of the ventricular action potential
Correct Answer
B. Atrial repolarization

Explanation
Atrial repolarization is not recorded on the standard 12-lead ECG trace. The ECG primarily measures the electrical activity of the heart's chambers, specifically the depolarization and repolarization of the ventricles. Atrial repolarization occurs at the same time as ventricular depolarization, so it is not easily distinguishable on the ECG. However, atrial depolarization is recorded as the P wave, ventricular repolarization is recorded as the T wave, and phase 2 and phase 4 of the ventricular action potential are reflected in the QRS complex and ST segment, respectively.

Rate this question:
6.

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?
- A.
  
  1
- B.
  
  2
- C.
  
  3
- D.
  
  4
- E.
  
  5
Correct Answer
C. 3

Explanation
The ST-segment on an ECG trace represents the plateau phase of the ventricular action potential. This is the phase where the ventricles are fully depolarized and contracted. In the given figure, portion 3 corresponds to the plateau phase, as it shows a sustained depolarization. Therefore, portion 3 most closely corresponds to the ST-segment on an ECG trace.

Rate this question:

1
2
7.

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
- A.
  
  Normal Normal Normal
- B.
  
  Normal Greater than normal Normal
- C.
  
  Normal Normal Greater than normal
- D.
  
  Bradycardia Normal Less than normal
- E.
  
  Bradycardia Greater than normal Less than normal
- F.
  
  Bradycardia Less than normal Normal
Correct Answer
A. Normal Normal Normal

Explanation
The heart rate is within the normal range, the PR interval is normal, and the QT interval is also normal.

Rate this question:

1
0

Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

Current Version
Mar 22, 2023

Quiz Edited by
ProProfs Editorial Team
Dec 09, 2011

Quiz Created by
Chachelly

Block 3 EKG Strips And Stuff

The T Wave on an EKG represents:

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

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

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

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

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?

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