A pacemaker is a device that takes over the work of the sinus node and/or the atrioventricular node, causing the heart to pump at its normal rate and rhythm. If necessary, a pacemaker delivers a small pulse of electricity, which causes the heart muscle to contract.
A pacemaker is a smooth metal box about 3 to 5 cm long, 4 cm wide and 0.5 cm high. Attached to it are one or two long wires, the pacemaker wires. The battery in the box provides the energy and enables the pacemaker to deliver an electrical impulse for many years.
In addition, the pacemaker contains the necessary electronics, which can be compared to a small computer. These electronics allow the pacemaker to respond to the effort required of the heart.
The pacemaker delivers its electrical impulses via one or two wires. A wire consists of very thin metal wires wrapped in an insulating plastic that is well tolerated by the body.
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