Electrocardiography is a testing method commonly used to determine if the heart has been damaged.
Also called E.C.G. or E.K.G., an electrocardiogram is a graphic record of the heart's electrical impulses. A Holter monitor is a 24-hour portable monitor of the electrocardiogram, used to detect silent ischemia or other problems. It allows a doctor to take 12 different recordings at the same time. Each lead records the same electrical impulse, but from a different position in relation to the heart. In this type of ECG, computers are used to amplify and enhance the ECG signal.