ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
ECG electrodes being attached to a patient's chest. They are connected to an electro- cardiography (ECG) machine, which monitors the electrical activity of the patient's heart. ECG is used to diagnose heart complaints including arrhythmia and coronary heart disease, and is commonly used to monitor the heart following surgery or a heart attack.
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