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Electrocardiography is the process of producing an electrocardiogram , a recording ? a graph of voltage versus time ? of the electrical activity of the heart[4] using electrodes placed on the skin. These electrodes detect the small electrical changes that are a consequence of cardiac muscle depolarization followed by repolarization during each cardiac cycle . Changes in the normal ECG pattern occur in numerous cardiac abnormalities, including cardiac rhythm disturbances , inadequate coronary artery blood flow , and electrolyte disturbances .