The waves of excitation, depolarisation and then repolarisation create electrical
potential differences between one part of the heart and another.
The spread of excitation through the myocardium involves small currents flowing
through the extracellular fluid.
Electrocardiography is the process of recording these changing
potential differences resulting from depolarisation and repolarisation of heart
An ECG recorder is a galvanometer which records the small voltage
changes between its positive and negative connections.
Back to menu