An EKG (also known a ECG) is an electrocardiogram that involves attaching electrodes to the chest of an individual to measure the electrical activity of the heart, hence electrocardiogram. This is done routinely to evaluate many heart disorders including an enlarged heart, arrhythmias, and evidence of prior heart damage such as a heart attack.
If done while someone is experiencing chest pain an EKG can detect that a person is actually having a heart attack. However, an EKG does not replace the need for sometimes more exhaustive heart studies, like an echocardiogram or nuclear stress test that, when indicated, will provide more information than just an EKG.
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