SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Pacemaker. Coloured X-ray of a heart pacemaker implanted in a patient's chest. The lungs are coloured red and yellow. The pacemaker is fitted over the ribs below the right collarbone (top left). Wires can be seen running from the pacemaker and battery unit (black) to electrodes (also black) at the top and bottom of the heart. Pacemakers supply electrical impulses to the heart to maintain a regular heartbeat. They correct a condition called heart block, in which the heart's natural pacemaker fails to work properly because of heart disease. The device fits just below the skin and allows the patient to lead a normal, active life.
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