Heart pacemaker. X-ray of the chest of a 39 year old male patient, showing a fitted heart pacemaker. This electronic battery-run device is seen in front of the ribcage, with a lead which connects it to the heart. The heart lies at centre and lower right, taking up part of one lung field. A pacemaker supplies electrical impulses to the heart to maintain the heartbeat at a regular rate. It may be external (worn on a belt) or internal (implanted in the chest). Pacemakers are fitted in patients suffering a heart block disrupting heart rhythm. Heart pacemakers may provide a fixed rate impulse or discharge only when a heartbeat is missed.
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