ALAIN POL, ISM / SCIENCE PHOTO LIBRARY ALAIN POL, ISM / SCIENCE PHOTO LIBRARY
Pacemaker. Coloured X-ray of a heart pacemaker implanted in a patient's chest. The pacemaker is fitted over the ribs below the right collarbone. A wire runs from the battery unit (red) across the sternum to the heart (pink, lower right). The dark blue areas show the location of the lungs. 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, resulting in episodes of dizziness, fainting attacks or stroke. The device fits just below the skin and allows the patient to lead a normal, active life.
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