Introduction: Pacemaker implantation is an invasive surgical method used in patients with a diseased cardiac conduction system. The pacemaker consists of a generator and an electrode, the generator is placed subcutaneously on the pectoral fascia and the electrodes are placed in the heart cavities via the transvenous route. The number of implanted pacemakers is continuously increasing due to the increase in the age of populations, expanded indicators of the development of new technologies, and thus the increase in complications after installation is present. Methods and sample: The study was conducted by retrospective analysis of medical records stored in the hospital information system, collected data obtained from patients and complications recorded after implantation of pacemakers. The study involved 2,076 respondents, patients who in the period from 01.01.2016. to 01.01.2021. A pacemaker was installed in the Clinical Hospital Center Rijeka, at the Clinic for Cardiovascular Diseases. The survey was conducted in the second half of July and the first half of August. Results: The obtained results showed that with the advent of new technology and knowledge about the installation of pacemakers, the incidence of complications is decreasing from year to year. The implant experience also contributes to the reduced occurrence of complications after the implantation of an pacemaker. Discussion: The implanted of a pacemaker is a "prolongation" of life, but it also requires and changes life habits. Therefore, it is necessary to approach each patient individually, with the aim of successful education and prevention of complications. For the past 5 years, in the Clinical Hospital Center Rijeka, there has been a decrease in the occurrence of complications after the implantation of pacemaker. The most common complications recorded in the study were the appearance of hematomas and the development of pneumothorax. Through continuous professional education of nurses / technicians and permanent acceptance of new knowledge in the field of cardiology, it is possible to timely detect and prevent possible complications after the implanted of a pacemaker.