Electrocardiography

1. Practical Exercise
Electrocardiography
Second Faculty of Medicine, Charles University
General Medicine, 1st year
Biophysics
Practical Exercises
Measurement, evaluation and determination of the electrical
heart axis using a 12-lead ECG

2. This slides show you how to get an ECG record from software, analyze
the record and fill your protocol.

3. 1. We need to download an ECG software. The software is free to download
from the webpage.
2. Click on
"Servis".
1. There is English
version also, but the
software is only on the
Czech webpages. And
you don‘t need English
to download it.

4. Chose "Software".

5. Click on "BTL 08 ver. 6.12.zip"
and save the zip file.

6. 2. Open the downloaded zip file and extract files.

7. Click on "Setup_BTL08win-6.12"
icon to install the software.

8. 3. Start the installed software (by click on the software icon).
This window will appear
because no ECG device is
connected to your computer.
Close this window by click on
"Use demonstration file F10".

9. Click on "Folders" to
open it.

10. 4. Create your card.
Open "New Card" by
double click on the icon.

11. 1. Name of your card is your
Team name (G1A, G3D or
so).
2. Open your card by double
click.

12. 1. Double click.
5. Add new patient into your card.
2. Fill in information
about your patient
(a person per a team).
3. Click on "Ok" to
save information.

13. 6. Start ECG examination.
You are in your
patient‘s card. Chose standard
ECG examination.

14. Click on "OK".

15. DEMO version is running. It is only
ECG simulation, because you have no
ECG device at home. However, the
DEMO version does nicely to
understand basic principles of the
ECG examination.
12 electrocardiograms
from a 12-lead
electrocardiography

16. Chose correct values of
Time base, Amplitude,
Filter and Time constant
by clicking on the icons.
Correct values.

17. 7. Save your ECG record.

18. The ECG record
is saved in the
patient‘s card.
Open it by
double click.

19. 8. The saved ECG record.
Click on "Print".

20. 9. Export the ECG record as a PNG image.
Click on "Export image F3".

21. 10. The exported PNG image.
Page 1/2

22. Page 2/2

23. 11. Open your Protocol. Fill in information.
Your practical
lecture e.g. 1st =
1, 2nd = 2 …
Date of your
practical
lecture
Group
number and
team letter
FILL IN
THE YELLOW
CELLS ONLY.
Paste the image.

26. 12. Print Einthoven‘s traingle (from pdf). Transfer values in mm
from the table "QRS
complex amplitudes
measurement" on the
triangle.
6.9 mm
20 mm

27. Make parallels.
This point is the
intersection of all
three parallels.

28. 13. Measure length of the QRS vector and slope (angle) of the QRS axis.
Length of
the vector
Slope
(angle) of
the axis
Use a ruler and a
protractor
for measurement.

29. 14. Make a photo of the triangle and paste on the protocol.
Length of
the vector
Slope
(angle) of
the axis
Paste measured
values.

30. 15. Compare measured values with normal values in the Discussion.
Cite the source.