What is an EKG and ECG?
An electrocardiogram — abbreviated as EKG or ECG — is a test that measures the electrical activity of the heartbeat. With each beat, an electrical impulse (or “wave”) travels through the heart. This wave causes the muscle to squeeze and pump blood from the heart. A normal heartbeat on ECG will show the timing of the top and lower chambers.
Fun fact about that whole K verus C debacle: The version with '-K-', more commonly used in American English than in British English, is an early-20th-century loanword from the German acronym EKG for Elektrokardiogramm (electrocardiogram), which reflects that German physicians were pioneers in the field at the time. Today AMA style and – under its stylistic influence – most American medical publications use ECG instead of EKG.
The right and left atria or upper chambers make the first wave called a “P wave" — following a flat line when the electrical impulse goes to the bottom chambers. The right and left bottom chambers or ventricles make the next wave called a “QRS complex." The final wave or “T wave” represents electrical recovery or return to a resting state for the ventricles.
Why is it done?
An ECG gives two major kinds of information related to heart disease. First, by measuring time intervals on the ECG, a doctor can determine how long the electrical wave takes to pass through the heart. Finding out how long a wave takes to travel from one part of the heart to the next shows if the electrical activity is normal or slow, fast or irregular. Second, by measuring the amount of electrical activity passing through the heart muscle, a cardiologist may be able to find out if parts of the heart are too large or are overworked.
Does it Hurt?
No. There’s no pain or risk associated with having an electrocardiogram. When the ECG stickers are removed, there may be some minor discomfort. But we make sure when come down to Brewster from whereever you come from on Cape Cod, you leave with a smile.
Is it harmful?
No. The machine only records the heartbeat. It doesn’t send electricity into the body.
Here is a standard EKG/ECG.