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Harvard Heart Letter

Electrocardiogram: Visualizing the heart's electrical signature

Published: March, 2008

A recording of the heart's electrical activity offers clues to its health and problems.

Editors' note: We are often asked about various tests used to check the heart and blood vessels. With this article we begin an occasional series describing the diagnostic tests that readers are likely to encounter.

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Electrocardiogram: Visualizing the heart's electrical signature

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