Physiology Lab

ECG Lab Report

ECG Paper:

A. Label the x and y axis on the ECG Paper below. What do brackets a and b specifically represent? Indicate the specific value and units

b

a

x-axis: ______________, bracket a: _______________

y-axis: _____________, bracket b: ______________

Measurement of Duration: Waves, Intervals, and Segments:

Measure the duration of the following on the ECG Below (sec):

  • P wave duration
  • T wave duration
  • R-R interval
  • PR interval
  • PR segment
  • QRS interval
  • QT interval

Show your measurements on the tracing above.

ECG component Normal Value

(sec)

Your measurement (sec)
P wave duration 0.06-0.11
T wave duration 0.16
R-R interval 0.6-1.0
PR interval 0.12-0.20
PR segment 0.08
QRS interval <0.12
QT interval 0.36-0.44

B. Determine the Heart Rate using all 3 methods outlined in the video:

Heart Rate:

Method 1
Method 2
Method 3

Heart Rate:

Method 1
Method 2
Method 3

Can you identify these Arrhythmias?

C:\Users\vpascoe\Documents\a10B lab\EKG strips\atrial flutter\atrial flutter 2.gif

Arrhythmia: __________________________

Distinguishing features:

C:\Users\vpascoe\Documents\a10B lab\EKG strips\ventricular tachycardia\ventricular tachycardia 2.png

Arrhythmia: __________________________

Distinguishing features:

C. Determine the arrhythmias represented by the following ECG strips:

C:\Users\vpascoe\Documents\a10B lab\EKG strips\sinus bradycardia\sinus bradycardia 2.jpg

Arrhythmia: __________________________

Distinguishing features:

C:\Users\vpascoe\Documents\a10B lab\EKG strips\fibrillations\atrial fibrillation 2.png

Arrhythmia: __________________________

Distinguishing features:

C:\Users\vpascoe\Documents\a10B lab\EKG strips\AV blocks\1st degree AV block B.gif

Arrhythmia: __________________________

Distinguishing features:

C:\Users\vpascoe\Documents\a10B lab\EKG strips\sinus tachycardia\sinus tachycardia 2.jpg

Arrhythmia: __________________________

Distinguishing features:

C:\Users\vpascoe\Documents\a10B lab\EKG strips\fibrillations\ventricular fibrillation 2.jpg

Arrhythmia: __________________________

Distinguishing features:

C:\Users\vpascoe\Documents\a10B lab\EKG strips\AV blocks\2nd degree AV block B.jpg

Arrhythmia: __________________________

Distinguishing features:

Arrhythmia: ____________________________

Distinguishing features:

Arrhythmia: __________________________

Distinguishing features:

D. Determine the Mean Electrical Axis represented by the 3 ECGs below

ECG 1:

C:\Users\vpascoe\Documents\a10B lab\EKG strips\normal axis\Repeat-12-lead-EKG-showing-normal-sinus-rhythm.png

C:\Users\vpascoe\Documents\a10B lab\EKG strips\vector plots\vector plot diagram 3.jpg

ECG 2

C:\Users\vpascoe\Documents\a10B lab\EKG strips\left axis deviation\LAD 2.jpg

C:\Users\vpascoe\Documents\a10B lab\EKG strips\vector plots\vector plot diagram 3.jpg

ECG 3

C:\Users\vpascoe\Documents\a10B lab\EKG strips\right axis deviation\RAD 2.png

C:\Users\vpascoe\Documents\a10B lab\EKG strips\vector plots\vector plot diagram 3.jpg

Questions:

1. Describe the relationship between depolarization and contraction of the heart? What does a P wave of an ECG represent? When would contraction of the atria occur relative to the P wave?

2. What does the QRS Complex of waves represent? When would contraction of the ventricles occur relative to the QRS complex?

3. Describe the relationship between repolarization and relaxation of the heart? What does the T wave represent? When would ventricular relaxation occur relative to the T wave? When does atrial repolarization occur?

4. What is meant by a “sinus” rhythm? Define tachycardia and bradycardia

5. Can an individual survive with atrial fibrillation? What is a dangerous complication of atrial fibrillation?

6. What is ventricular tachycardia a concern? What happens when ventricular tachycardia deteriorates (gets worse)?

7. Describe the progression of AV Blocks. What is a major difference between a 1st degree and a 2nd degree AV Block?

8. What does PVC stand for and how are they identified on an ECG?

9. What is the isoelectric line of an ECG? What does it mean when a wave points up from the isoelectric line? What does it mean when a wave points down from the isoelectric line?

10. What is an equiphasic wave or wave complex?

11. Define the Mean Electrical Axis of the heart. Why is this axis really a mean ventricular axis?

12. Explain what a normal mean electrical axis is. Why do you think that the normal range is so broad?

13. Explain LAD and what might cause it.

14. Explain RAD and what might cause it.

15. Explain Extreme RAD and what might cause it.