![]() ![]() In the case of a three-probe pacemaker, the third probe is implanted by the coronary sinus, in contact with the left ventricle. When there are two probes, they stimulate the atrium and right ventricle. In the case of a single probe pacemaker, it stimulates the right ventricle. The case can be connected to a single probe with two probes or three probes in case of heart failure. Pacemaker probes are flexible electrodes that connect the case to the cavities of the heart. It contains a lithium battery and is connected to the heart by probes. The case is a small round device a few centimetres in diameter (maximum 10 cc) filled with electronics and implanted under the skin, at the level of the clavicle. The function of the pacemaker is to cause cardiac contractions that the heart can no longer perform properly on its own by sending it electrical stimuli. In summary, the pacemaker only works if the heart rate falls below a reference threshold determined by the doctor. In addition, this pacemaker can store information about the heart rate and data about how it works. It is able to constantly analyze the rhythm of the heart, especially when it is abnormal, and to stimulate it if necessary without the slightest unpleasant sensation. It is connected to the heart by one, two or three probes depending on the case. A pacemaker is a small box, containing electronic circuits powered by a battery.
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