Heart pacemaker. Coloured chest X-ray showing a surgically-implanted heart pacemaker (red,upper right). The two lungs appear black inside the ribcage bones,while the heart is the white region at lower centre right. The pacemaker supplies electrical impulses along a lead (part of which is coiled) 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 in patients with a heart block which impairs the nerve impulses generated by the node. Heart pacemakers may provide a regular impulse or discharge only when a heartbeat is missed | |
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Crédit: | Science Photo Library |
Taille de l’image : | 4671 px × 3815 px |
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