Heart pacemaker. Coloured chest X-ray showing a surgically-implanted heart pacemaker (yellow,centre left). The two lungs (multicoloured,centre left and right) and the heart (light green,lower right) are also seen. The pacemaker supplies electrical impulses along a lead (not clearly seen) to the heart to keep it beating regularly. Pacemakers are fitted in patients with a malfunct- ioning 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) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Kulyk, Mehau |
Taille de l’image : | 4480 px × 3844 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |