Cardiac pacemaker was implanted as a therapeutic method for children with atrio-ventricular block, sick sinus syndrome, LQT syndrome, cardio-depressive syncope. Twenty six children (aged 1-17) underwent pacemaker implantation or exchange of pacemaker and electrode. In nineteen cases cardiac peacemaker was implanted in the endocardial system; in the next seven cases epicardial system was required. The difference between the implantations depended on patient's age and the character of the disease. The single chamber peacemaker was implanted in twenty children, dual-chamber in six patients. There were no visible complications in follow up observation and constant heart stimulation can be considered as a safe way of children's severe bradycardia treatment.