An electrocardiogram (ECG) is a medical device used to measure and record the electrical activity of the heart. It is abbreviated as an ECG or EKG (electrocardiogram).<br /><br />The device uses electrodes (small stickers) placed on specific areas of the body, such as the chest, arms, and legs.<br />These electrodes capture the electrical signals emitted by the heart during a heartbeat, and these are displayed as waves on a screen or printed on special paper.<br /><br />It helps doctors:<br />• Diagnose heart rhythm disturbances (such as a fast or slow heartbeat).<br />• Detect heart attacks or their early signs.<br />• Monitor the condition of the heart before or after surgery.<br />• Monitor the effects of certain medications on the heart.<br /><br />No, an ECG is painless and harmless. The electrodes are simply placed on the skin for a few minutes.<br /><br />Types of ECGs:<br />• Regular (resting) ECG: Used while lying down for a short time.<br />• Stress ECG: Performed while engaging in physical activity (such as walking on a treadmill).<br />• Holter monitor: Worn for 24–48 hours to record continuous heart activity.