Which test measures the electrical activity of the heart?

Name: Which test measures the electrical activity of the heart?
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An electrocardiogram (ECG) measures the electrical activity of the heart. An angiogram is a test that uses X-ray imaging to see your heart's blood vessels. An MRI (magnetic resonance imaging) is a scan that uses powerful magnets and radio waves to create detailed images of the body. An echocardiogram uses sound waves to create images of the heart.

Which Test Measures the Electrical Activity of the Heart