BSIP, LAURENT / CABY / SCIENCE PHOTO LIBRARY BSIP, LAURENT / CABY / SCIENCE PHOTO LIBRARY
ECG diagnosis. Doctor examining electrocardiogram (ECG) traces of a human heartbeat. The heart is a hollow muscle that pumps blood around the body. The ECG traces measure the beating of the heart as a series of waves which correspond to the electrical activity of the heart muscle just before it contracts. ECGs are an important way of monitoring the heart's health.
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