An electrocardiogram (EKG, ECG) is a test that measures the
electrical signals that control heart rhythm. The test measures how electrical
impulses move through the heart muscle as it contracts and relaxes.
During an electrocardiogram, small pads (electrodes) are attached
to the skin on the chest, arms, and legs. The electrodes are also connected to
a machine that translates the electrical activity into line tracings on paper.
These tracings are often analyzed by the machine and then carefully reviewed by
a doctor for abnormalities.