An electrocardiogram (eh-lec-troe-CAR-dee-oh-gram,) or EKG,
(E-K-G) measures changes in the heart's electrical activity. The
test itself is painless and takes only a few minutes. When
combined with a stress test, EKG's are helpful in diagnosing
coronary artery disease resulting from the hardening of the
arteries. During this procedure, electrodes are attached to the
arms, legs, and front of the chest, and the patient begins to
exercise, usually on a treadmill. The heart's electrical
activity, communciated via the electrodes, is either displayed
on a screen or recorded as a trace on paper. EKG's from a
normal, healthy heart have a characteristic shape. Any
irregularity in the heart's rate, rhythm, or structure, as well
as damage from previous heart attacks, can alter its electrical
activity, and may show up on the screen or print-out. EKG's are
also used in intensive care, major surgery, and sometimes during
childbirth to constantly monitor a patient's heart. For more
information about electrocardiograms, cont