Electrocardiography

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Electrocardiography is the process of using an electrocardiograph (a device) to produce an electrocardiogram (a recording, often called an ECG or EKG) that shows a line graph of the heart's electrical activity through repeated cardiac cycles. It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the heart 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 (heartbeat). Changes in the normal ECG pattern occur in numerous cardiac abnormalities, including: Cardiac rhythm disturbances, such as atrial fibrillation and ventricular tachycardia Inadequate coronary artery blood flow, such as myocardial ischemia and myocardial infarction electrolyte disturbances, such as hypokalemia Traditionally, "ECG" refers to a 12-lead ECG taken while lying down as discussed below. However, other devices can record...

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