ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Electrocardiography. 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 onto a chart called an electrocardiogram (lower centre). This man is having an ECG exam as part of the pre- admission procedure before a hip replacement operation. It is important to check that the patient's heart is healthy before administering an anaesthetic.
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