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An electrocardiogram, also known as EKG or ECG, is a test that records the electrical activity of the heart. It can be highly effective at detecting and locating the source of heart problems.
Electrical signals from the brain cause the heart to contract, allowing it to pump blood through the body. An EKG can measure the speed of the heart beating, whether the rhythm is steady or irregular, and the strength of the electrical signals as they move within the heart.
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