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ECG examination. Doctor carries out an electrocardiograph (ECG) examination on a man to monitor the health of his heart. Electrodes attached to his chest output to the ECG machine at bottom left. The printed trace shows a healthy heartbeat. ECG machines monitor electrical impulses made by the heart during each contraction of its muscles and at rest. The resulting trace can be used to detect certain disorders of the heart, which produce a characteristic pattern.
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