MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
Electrocardiography. Close-up of electrodes on the chest of a patient undergoing an electrocardiography (ECG) examination. A doctor is attaching the electrodes, which will measure the electrical activity of the patient's heart. The results will be recorded by an ECG machine 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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