MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
Electrocardiography. Young male patient undergoing an electrocardiography (ECG) examination. Electrodes attached to his chest measure the electrical activity of his heart. The results are recorded by the ECG machine next to his bed as an electrocardiogram. ECG can diagnose a range of heart complaints, and is commonly used to monitor the heart following surgery or a heart attack.
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