AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Heart pacemaker surgery. Image 7 of 9. Close-up of a surgeon inserting the main body of a pacemaker into a patient's chest. It is being inserted just under the skin through an incision just below the collar bone (clavicle). It is attached to wires that are implanted into the muscle. A pacemaker is a device that supplies electrical impulses to the heart to keep it beating regularly. This pacemaker is being fitted to treat a heart block. This condition impairs the nerve impulses created by the sinoatrial node, the part of the heart that initiates the heartbeat. For a sequence showing the operation see M560/596 to M560/604.
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