DENNIS POTOKAR / SCIENCE PHOTO LIBRARY DENNIS POTOKAR / SCIENCE PHOTO LIBRARY
ECG printout. Fingers holding a printout of an ECG (electrocardiogram) trace of a healthy heartbeat. An ECG uses electrodes to measure the electrical activity of the heart during the pumping of its chambers, and records it as an electrical wave. Electrocardiography is a useful tool for the diagnosis of heart disease. The waves of an ECG trace can reveal the nature and location of many cardiac disorders.
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