SCOTT DIXON / SCIENCE PHOTO LIBRARY SCOTT DIXON / SCIENCE PHOTO LIBRARY
Animation showing a healthy ECG waveform, pulling back to show a beating heart. ECG (electrocardiography) is a diagnostic procedure that measures the electrical activity of the heart during its beating cycle. Electrodes attached to the chest pick up the activity, and display it as a waveform, showing voltage versus time. The heartbeat is controlled by regular electrical signals produced by specific parts of the heart, which control its muscles in a wave. Analysis of the ECG can reveal many common heart disorders.
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