Lab 3 – Cardiophysiology I

Activity 1. Components of an ECG

 

 

 

 

    1. For the EKG wave above, label the letters shown above and give the heart activity taking place.

Name                           Hear Activity

    2.  A. __________                   ____________________________
    3. B. __________                    ____________________________
    4. C. __________                    ____________________________
    5. D. _________                     ____________________________
    6. E. __________                    ____________________________

 

 

 

 

  1. Using vertical lines show the following segments and intervals and indicate the heart activity taking place for each. If any is not on the diagram, write NA.

A.  P-R interval             _________________________
B.  P-R segment           _________________________
C.  QRS complex          _________________________
D.  S-T segment           _________________________
E.  S-T interval             _________________________
F.  R-R interval             _________________________
G.  Q-T interval             _________________________

3.  What does each of the following distances indicate of time (sec) and heart rate (bpm)?

    Time(sec)             Heart rate (BPM)

A.  One small square     ______________        _______________
B.  5 small squares         ______________       ________________
C.  One large square      ______________       ________________
D.  4 large squares         ______________       ________________
E.  5 large squares         ______________       ________________
F.  15 large squares       ______________         ________________

Activity 2 – Interpreting an ECG

Using the above ECG, give the following measurements for each of the following. Indicate if each one is in the normal range.

 

Calculate the heart rate, asuming this EKG is regular.

 

Activity 3 – EKG Measurements at Various Time Points

ECG can be measured using either the LapQuest 2 handheld device or the regular EKG instrument. (If using the LabQuest2 follow the instructions given.)

1. Recording Baseline Readings

1. Take an EKG of everyone in your group.
2. Select who will be the experimental subject is.
3. Take an average of three separate readings. Use a ruler to measure the various regions.

  1. Effect of standing

Repeat the measurements with the test subject standing.

What are the effects of standing on each of the above?

 

3. Effect of exercise

Repeat the measurements after the test subject has exercised for 3 minutes. Be sure to have the electrodes in place so as to connect the leads as soon as the person is done exercising

What are the effects of exercise on each of the above? Summarize your results in a paragraph form.

 

Repeat the measurement after 5 minutes of rest.

What was the overall effect of resting on the above readings?