An electrocardiogram (ECG or EKG) is a non-invasive test that measures the electrical activity of the heart. During an ECG, small electrodes are placed on the skin of the chest, arms, and legs, and a machine records the electrical signals that are produced by the heart.

An ECG can provide valuable information about the heart's rhythm, rate, and electrical activity. It is commonly used to diagnose and monitor a wide range of heart conditions, including:

• Arrhythmias: These are abnormal heart rhythms, which can be detected and diagnosed through an ECG.

• Coronary artery disease: An ECG can show signs of reduced blood flow to the heart, which can be a sign of coronary artery disease.

• Heart attack: An ECG can detect changes in the heart's electrical activity that can indicate a heart attack.

• Structural abnormalities: An ECG can show signs of enlarged or thickened heart muscle, which can be a sign of a heart condition.

ECGs are typically painless and non-invasive, and the procedure usually takes only a few minutes. If you have questions or concerns about an ECG or the results, it is important to discuss them with your healthcare provider.