AJ PHOTO / HOP AMERICAIN / SCIENCE PHOTO LIBRARY AJ PHOTO / HOP AMERICAIN / SCIENCE PHOTO LIBRARY
Electrocardiograph (ECG) machine being operated by a doctor. This machine is attached by electrodes to a patient's chest and is used to monitor the electrical activity of the patient's heart. The results are recorded by the machine as a trace on moving graph paper (right). The trace can then be used to diagnose the health of the heart and to detect heart diseases and abnormalities which produce a characteristic electrical pattern.
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