The EKG is a noninvasive test used to measure electrical activity in the heart. Electrical sensors, called leads, are attached to predetermined positions on the arms, legs, and the front part of your chest. These leads record electrical activity, heart rate, and heart rhythm. An EKG can diagnose abnormalities of the beating of the heart, called arrhythmias (see question 87 for more details), as well as enlargement of the heart muscle, called hypertrophy.An EKG can also help to diagnose a heart attack (a myocardial infarction), which is a common cause of heart failure.
Victoria’s comment: I get an EKG about four times per year at my cardiologist’s office and at least one more at my internist’s office. I had a problem with coronary artery disease, so my doctors say they have to watch out for signs of heart attack. My cardiologist made a miniature copy of my EKG and I carry it in my purse in case I have trouble breathing and have to go to a doctor’s office or an emergency room. It helps the doctors to see my old EKG when they are trying to decide if I have had any changes in the EKG that could indicate a heart attack.