Arrhythmias are heart rhythm disorders. A normal heart rhythm is called a sinus rhythm. An electrical activity is generated in the conduction system and spreads as an electrical impluse to the working muscles of the heart and excites it to mechanical activity. There is a whole spectrum of arrhythmias, from harmless to life-threatening. The most common division of arrhythmias is according to the heart rate: bradyarrhythmias and tachyarrhythmias. Atrial fibrillation is the most common arrhythmia in the general population. It is a very common supraventricular arrhythmia that can endanger patients and reduce their quality of life. The mechanism of atrial fibrillation itself has not been fully elucidated. It is considered that the causes of development and maintenance of arrhythmia is multifactorial. Treatment can be carried out pharmacologically with antiarrhythmic drugs and by invasive methods such as catheter ablation and surgery. Catheter ablation is an invasive procedure in which catheters are inserted into the heart to ablate certain structures. The most common method of catheter ablation is ablation with RF energy. Ablation can be done focally, on proven foci of impulse outbreaks, followed by isolation of the pulmonary veins, the ablation of the coronary sinus and other ablation of arrhythmogenic structures inside the heart. A newer method that is increasingly used to isolate the pulmonary veins is cryoablation, in which the PV ostia are frozen with a balloon catheter. Heart navigation and visualization systems play a key role in successful ablation. These systems include EAM, ICE, fluoroscopy, and CT and MR rotational angiography. Before, during and after catheter ablation, it is certainly very important to carry out an appropriate anticoagulant therapy to reduce the risk of thromboembolic incidents. Complications of the procedure are relatively rare, and efforts are beeing made to lower their occurrence through proper patient monitoring and ever-improving operating technologies. In addition to catheter ablation, there are also methods of surgical ablation. Surgical ablation methods are recently combined with catheter ablation methods in the so-called hybrid operations. We consider heart patients, in this case, patients suffering from atrial fibrillation and undulation, as high-risk patients, and in such patietns it is primarily necessary to prevent possible complications, the most common of which is a stroke. The nurse's role is very important here because it is necessary to carry out quality education about the importance of therapy, adherence to the instructions given about the side effects of drugs and the signs and symptoms of thromboembolism and bleeding. The nursing role also refers to the interventions that need to be carried out during patient care, which is described in the upcoming text of the paper.