ARNO MASSEE / SCIENCE PHOTO LIBRARY ARNO MASSEE / SCIENCE PHOTO LIBRARY
Cardiac testing. Patient having the function of his heart checked prior to undergoing a kidney transplant. The electrodes placed on his chest pick up electrical signals from the heart and send them to a machine which produces a readout of the heart's activity over time. This is known as an electrocardiogram (ECG) and helps to tell if the heart if functioning properly.
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