AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Electrocardiography. The electrodes attached to his chest (upper frame) are used to measure the electrical activity of his heart. This is recorded and printed out (lower frame). An ECG examination can help diagnose a range of heart complaints, such as arrhythmia, coronary artery disease and cardiac asthma. Photographed at the American Hospital of Paris, France.
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