An electrocardiogram (ECG or EKG) records the electrical signal from your heart to check for different heart conditions. Electrodes are placed on your chest to record your heart's electrical signals, which cause your heart to beat. The signals are shown as waves on an attached computer monitor or printer.
How does an electrocardiogram machine work?
The electrodes are connected to an ECG machine by lead wires. The electrical activity of the heart is then measured, interpreted, and printed out. No electricity is sent into the body. Natural electrical impulses coordinate contractions of the different parts of the heart to keep blood flowing the way it should.
What should you not do before an EKG?
To prepare for an EKG:
- Avoid oily or greasy skin creams and lotions the day of the test. They interfere with the electrode-skin contact.
- Avoid full-length hosiery, because electrodes need to be placed directly on the legs.
- Wear a shirt that can be easily removed to place the leads on the chest.
