A pacemaker is a small electronic device that is inserted subcutaneously into the body. Its function is to keep the heart rate normal when a problem is detected in the electrical system of the heart. It is a small generator in charge of sending electrical signals when necessary to correct the heart’s beating. The type of pacemaker is decided depending on the arrhythmias suffered by the patient. It is fitted by the surgeon in a simple and low risk surgical procedure. The surgery is performed by making an incision in the skin below the clavicle to create a small pocket-shaped space, through which the pacemaker cable is inserted and is led into a vein in the upper chest. From there, it is guided to the heart cavities and the pacemaker generator is connected to the cable. Finally, in order to regulate the most suitable heart rate for each patient, the pacemaker controls are programmed.