ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Electrocardiography. Elderly woman having her heart monitored by electrocardiography (ECG). The ECG machine measures the electrical activity of her heart from electrodes attached to her wrists, ankles and chest. ECG can diagnose a range of 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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