An electrocardiogram (ECG, EKG) is a commonly used procedure in which the electrical events associated with the beating of the heart are evaluated. (A) Skin electrodes are applied to the chestwall, which send electrical signals to a computer that interprets the signals into graph form. (B) Illustration of the electrical events of the heart and a normal ECG/EKG. (C) An electrocardiogram is useful in identifying arrhythmias, as shown here.
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