ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Cardiac pacemaker. Coloured chest X-ray of a pacemaker in a 70-year-old woman who has cardiac insufficiency. He is undergoing an examination known as venography. The pacemaker is at upper right (white). The pacemaker is designed to maintain the normal rhythm of the heart by delivering electrical impulses through the wires (white) running from the pacemaker to the heart (lower centre).
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