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).
The device uses electrodes (small stickers) placed on specific areas of the body, such as the chest, arms, and legs.
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.
It helps doctors:
• Diagnose heart rhythm disturbances (such as a fast or slow heartbeat).
• Detect heart attacks or their early signs.
• Monitor the condition of the heart before or after surgery.
• Monitor the effects of certain medications on the heart.
No, an ECG is painless and harmless. The electrodes are simply placed on the skin for a few minutes.
Types of ECGs:
• Regular (resting) ECG: Used while lying down for a short time.
• Stress ECG: Performed while engaging in physical activity (such as walking on a treadmill).
• Holter monitor: Worn for 24–48 hours to record continuous heart activity.