ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
ECG electrodes. Electrodes attached to a patient's chest during an electrocardiography (ECG) test. They are connected to an ECG machine, which monitors the electrical activity of the patient's heart. The test is used to diagnose heart complaints such as arrhythmia and coronary artery disease, and is commonly used to monitor the heart following surgery or a heart attack.
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