DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Heart pacemaker in the chest of an 80 year old woman, one week after it was fitted. A pacemaker is a device that supplies the heart with electrical impulses to maintain a regular heartbeat. In this case, it was fitted to treat heart block, a condition in which the heart fails to distribute its own electrical impulses correctly.
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