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Electrocardiography

Electrocardiography (ecg or ekg from greek: kardia, meaning heart) is a transthoracic (across the thorax or chest) interpretation of the electrical activity of the heart over a period of time, as detected by electrodes attached to the surface of the skin and recorded by a device external to the body. the recording produced by this noninvasive procedure is termed an electrocardiogram (also ecg or ekg).