ECG e-learning in video



Placement of electrodes

Myocardial cells action potential

Welcome to this series of tutorials concerning ecg 's reading

Basics definitions:

- an electrocardiogram is a recordering of the heart 's electrical activity
- it is generally recorded on a graph paper 

- it is the machine that records the electrocardiogram

- was recorded in 1895 by Whilem Einthoven, a Dutch physiologist
- Whilem Einthoven received the Noble Price in Physiologie and Medicine in 1924 for his works on ECG
- the ECG was then improved by Wilson (1938) and Emmanuel Goldberger (1942) who determined the ecg as it is used today

- during its activity, the heart produces an electric field
- the ECG records this electric field and its variations
- an Electric Field is always recorded between 2 electrodes
- the ECG uses 2 kinds of electrodes:
        - bipolar electrodes: a classical pair of electrodes
        - unipolar electrodes: only one electrode is present, the second is a neutral           electrode that doesn't appear
- a pair of electrodes that records the electrical activity of the heart with a determined polarised direction is called a lead. A lead is represented by a vector.