Electrocardiogram (EKG) 
What is this test? An electrocardiogram (often called an EKG) is a recording of the electrical activity within the heart obtained from the placement of various electrodes on the skin surface. Why this test may be performed? An electrocardiogram is performed to evaluate the heart rate and rhythm. An EKG can detect heart muscle damage in persons who are having or have had a myocardial infarction (heart attack). Enlargement of the pumping chamber (left ventricle) of the heart can also be detected on an electrocardiogram. What does this test involve? An electrocardiogram can be performed in a doctor's office, cardiology suite or at the hospital bedside. The person is placed in a reclining position with the extremities and chest exposed. Electrodes are placed on the upper arms, lower legs and chest utilizing either straps or suction cups. Conductive gel may be applied to the skin before the electrodes are placed. During this test, you will be asked to remain still, since patient movement affects the quality. A graphic printout is obtained and forwarded to a physician for interpretation. The entire test takes about five to 10 minutes. It requires no special preparation or aftercare. What are the risks/precautions for this test? An electrocardiogram is considered a non-invasive test. It is painless and not associated with any risks to the patient. What do the results mean? An electrocardiogram can provide information about your heart rate and rhythm. A normal resting heart rate is 60 to 90 beats per minute. Disturbances in heart rhythm, when present on the EKG, show the electrical system of the heart is malfunctioning. If you have suffered a myocardial infarction (heart attack), the electrocardiogram will help to pinpoint the area and extent of heart muscle damage. When the pumping chamber of the heart becomes enlarged, as a result of overwork, it shows on the electrocardiogram. Source: American Heart Association
This article was reviewed and updated June 2007.
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