Electrocardiography is a test that measures your heart’s electrical activity. It's quick, painless, and harmless.
The results of that test are shown in an electrocardiogram. It looks like a wavy line with spikes on a grid (a tracing). The electrocardiogram gives doctors information about:
Both the test and the results are referred to as an ECG, sometimes also called an EKG.
Small, round sensors (electrodes) that stick to the skin are placed on your arms, legs, and chest
Wires that snap on to the sensors are connected to a machine
As your heart beats, the sensors measure your heart’s electrical currents
The machine records information from each sensor and develops an ECG (a wavy line with spikes) for your doctor to read
An ECG helps your doctor learn many things about your heart, including: