MIKE DEVLIN / SCIENCE PHOTO LIBRARY MIKE DEVLIN / SCIENCE PHOTO LIBRARY
Electrocardiograms and a stethoscope. Electro- cardiography is a technique for recording the electrical activity of the heart. Electrodes are placed on the skin of the four limbs and the chest wall and the electrical signals are recorded on a moving paper strip. The ECG aids in the diagnosis of heart disease, which may produce character- istic changes in the pattern of electrical activity.
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