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109 - 3-, 6-, AND 12-LEAD ECG
An electrocardiogram (ECG) is a graphic recording of the changes occurring in the electrical potentials between different sites on the skin (leads) as a result of cardiac activity. Depolarization of the cardiac cells is the central electrical event of the heart. This occurs when the cardiac cells, which are electrically polarized, lose their internal negativity.
Depolarization is distributed from cell to cell, producing a wave of depolarization that can be transmitted across the entire heart. This wave represents a flow of electricity and it can be detected by electrodes placed on the surface of the body. Once depolarization is complete, the cardiac cells are able to restore their resting polarity through a process called repolarization. This flow of electricity can also be sensed by recording electrodes.
