The vast majority of people who have a pacemaker implanted do not feel the electrical impulses at all, because the electrical impulses from the pacemaker are very weak. If you do feel an electrical impulse, your follow-up doctor can adjust the settings to make you feel more comfortable. Pacemakers have many safety features but sometimes pacemakers do not work properly due to the influence of an electromagnetic energy source from outside. It is also possible that the tip of the electrode lead may be displaced inside the heart, making the pulse no longer work. In rare cases, the pacemaker slips in the “bag” of the chest cavity. However, these problems can be solved with the help of a doctor. Finally, remember that pacemakers are, after all, man-made machines that need to be regulated regularly, and it is important to monitor them regularly during follow-up visits. Contact your doctor immediately if you: 1. find yourself experiencing fatigue, shortness of breath or a change in heart rate; 2. notice redness, warmth, swelling, more pain or the beginning of fluid secretion from the wound; 3. symptoms that you had before the pacemaker implantation seem to reappear.