An electrocardiogram (EKG or ECG) is a test that checks for problems with the electrical activity of your heart. An EKG shows the heart’s electrical activity as line tracings on paper. The spikes and dips in the tracings are called waves.
Your physician can use this electrocardiogram to look for patterns among your heartbeats and rhythms to confirm they are normal or to diagnose various heart conditions.
This information was found via Mayo Clinic, to read the full article, please click here.