Amy Scholten, MPH
An ECG can show the electrical activity of your heart. It will appear as a pattern on a graph. It can help to show abnormal movements or working of the heart.
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Reasons for Test
An ECG is used to:
and rhythm problems
Offer clues about other heart conditions and conditions not directly related to the heart
Detect conditions that change the body’s balance of electrolytes, such as
magnesium Detect other problems, such as overdoses of certain drugs
Symptoms that may lead to your doctor ordering an ECG include:
Chest discomfort or pain
Shortness of breath
Rapid heart beat
History of fainting
An ECG may also be done if you:
Are about to have surgery with
general anesthesia Are in occupations that stress the heart or where public safety is a concern
Are an older adult or have diabetes
Already have heart disease
Have had a heart-related procedure, such as getting a
There are no major problems linked to this test.
What to Expect
Prior to Test
Be asked about your health history.
Your chest may be shaved.
Description of Test
You will be asked to lie quietly on your back. Six small, sticky pads will be placed across your chest. Other pads will be placed on your arms and legs. Wires will be attached to the pads. The wires will also connect to the ECG machine. You will not feel anything during the test.
You can return to your normal activity after the test.
How Long Will It Take?
Your doctor will review the ECG. The results may lead to:
More tests to confirm a diagnosis
Call Your Doctor
Call your doctor if you have heart-related symptoms. This includes chest pain or trouble breathing.
If you think you have an emergency, call for emergency medical services right away.
American Heart Association
Heart Rhythm Society
http://www.hrsonline.org CANADIAN RESOURCES:
Canadian Cardiovascular Society
Heart and Stroke Foundation of Canada
Electrocardiogram (EKG or ECG). American Heart Association website. Available at:
...(Click grey area to select URL) Updated September 11, 2015. Accessed March 5, 2018.
Noninvasive tests and procedures. American Heart Association website. Available at:
...(Click grey area to select URL) Updated September 16, 2016. Accessed March 5, 2018.
What is an electrocardiogram? National Heart, Lung, and Blood Institute website. Available at:
...(Click grey area to select URL) Accessed March 5, 2018.
Last reviewed March 2018 by
EBSCO Medical Review Board
Alan Drabkin, MD Last Updated: 7/6/2018