An electrocardiogram (ECG or EKG) is a recording that shows the electrical activity of the heart. It is produced during an electrocardiography test, where small sensors called electrodes are placed on the skin of the chest, arms, and legs. These electrodes pick up the heart’s electrical signals and create a visual representation of the heart's rhythm and activity. The ECG recording helps doctors diagnose heart conditions, such as arrhythmias and heart attacks, by revealing any irregularities in the heart’s electrical patterns. The test is quick, does not involve any surgery or needles, and provides valuable information about heart health.

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