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Home > All Images > 1999 > December > 9 Dec 1999

Images Dated 9th December 1999

Choose from 14 pictures in our Images Dated 9th December 1999 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Coloured chest X-ray showing heart pacemaker Featured 9 Dec 1999 Print

Coloured chest X-ray showing heart pacemaker

Heart pacemaker. Coloured chest X-ray showing a surgically-implanted heart pacemaker (yellow oval, upper left). The two lungs (large black areas) and the heart (red, centre) are also seen. The pacemaker supplies electrical impulses along a lead (white) to the heart to keep it beating regularly. Pacemakers are fitted in patients with a malfunctioning sinoatrial node, the part of the heart which initiates each heartbeat, or a heart block impairing the nerve impulses generated by the node. Heart pacemakers may provide a regular impulse (fixed rate pacemaker) or discharge only when a heartbeat is missed (demand pacemaker)