06/01/2025
An electrocardiogram (ECG or EKG)
An electrocardiogram (ECG or EKG) is a quick test to check the heartbeat. It records the electrical signals in the heart. Test results can help diagnose heart attacks and irregular heartbeats, called arrhythmias.
Why it's done
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.
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