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NCI Dictionary of Cancer Terms


electrocardiogram  listen  (ee-LEK-troh-KAR-dee-oh-gram)

  A line graph that shows changes in the electrical activity of the heart over time. It is made by an instrument called an electrocardiograph. The graph can show that there are abnormal conditions, such as blocked arteries, changes in electrolytes (particles with electrical charges), and changes in the way electrical currents pass through the heart tissue. Also called ECG and EKG.