An electrocardiogram is a simple and painless test that usually takes just a few minutes. You’ll lie on a table while sensors are attached to your chest. The sensors record your heart’s electrical activity and send it to a machine that displays the results on paper.
An electrocardiogram is one of the best ways to diagnose many heart problems. It can often identify heart damage from a previous heart attack or other conditions, such as coronary artery disease (CAD) or arrhythmia.