Cardiovascular diseases are a significant public health problem in the world and one of the leading causes of morbidity and mortality. Cardiovascular diseases also include heart rythm disorders, i.e.arrhythmias. A normal heart rythm is a sinus rythm. Arrhythmias occur due to disturbances in the generation or conduction of heart impulses. Arrhythmias can be classified according to differetnt criteria. Depending on the heart rate, arrhythmias are divided into bradyarrhythmias and tachyarrhythmias. Patients with arrhythmia can be asymptomatic, but most often they have a feeling of irregular or rapid heartbeat. Shortness of breath, weakness, chest pain, presyncope and syncope can also occur. Some arrhythmias can be fatal. To diagnose arrhythmia, in addition to a good medical history and physical examination, along with other diagnostic tests, it is indispensable to to an electrocardiogram, which is a graphic display of the heart's electrical activity. Arrhythmia is treated with regard to the cause of their occurance. Different methods of treatment are used, from drug therapy to invasive procedures, such as radiofrequency ablation. In cases of symptomatic bradyarrhythmia and some heart blocks, especially the ones that are followed by a syncope, it is nesessary to implant a temporary or a permanent electrostimulator (pacemaker) for the heart. Pacemakers are devices that provide electrical stimulation of the heart in accordance with the needs of the patient at rest and under load. The nurse plays an important role in the healthcare of the patient who has had electrostimulators implanted. In addition to being constantly present, observing and solving various nursing problems, that can occur with these patients, the nurse also conducts health education which includes nutrition education, how to take medications and the life style after pacemaker implantation.