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With each heartbeat, an electrical signal spreads from the top of the heart to the bottom. As it travels, the signal causes the heart to contract and pump blood. The process repeats with each new heartbeat.
The heart's electrical signals set the rhythm of the heartbeat. For more detailed information and animations, go to the Health Topics How the Heart Works article.
An EKG shows:
Doctors use EKGs to detect and study many heart problems, such as heart attacks,arrhythmias (ah-RITH-me-ahs), and heart failure. The test's results also can suggest other disorders that affect heart function.
This information taken from http://www.nhlbi.nih.gov/health/health-topics/topics/ekg/
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