ECG machine

An electrocardiogram (ECG or EKG) is done to check the heartbeat. It shows how fast or how slow the heart is beating. ECG test results can help your care team diagnose:

• Irregular heartbeats, called arrhythmias.
• A previous heart attack.
• The cause of chest pain. For example, it may show signs of blocked or narrowed heart arteries.

An ECG also may be done to learn how well a pacemaker and heart disease treatments are working.

You may need an ECG if you have:

• Chest pain.
• Dizziness, lightheadedness or confusion.
• Pounding, skipping or fluttering heartbeat.
• Fast pulse.
• Shortness of breath.
• Weakness or fatigue.
• Reduced ability to exercise.

If you have a family history of heart disease, you may need an electrocardiogram to screen for heart disease, even if you don't have symptoms. The American Heart Association says ECG screening may be considered for those at low risk of heart disease in general, even if there are no symptoms. Most heart doctors consider an ECG as a basic tool to screen for heart disease, although its use needs to be individualized.

If symptoms tend to come and go, a regular ECG may not find a change in the heartbeat. Your healthca re team may suggest wearing an ECG monitor at home. There are several types of portable ECGs.