Scientific and technological progress, accompanied by the emergence of new methods of surgical treatment, is a factor that increases the life expectancy of the population, which in turn is associated with an increase in the population of diseases of the cardiovascular system. For successful treatment of postoperative rhythm disorders, accurate diagnosis is necessary, which can be difficult. In most cases, the large morphology of P waves can be mistaken for a typical atrial flutter, the low voltage of the latter, on the surface electrocardiogram, is associated with a short circle of macro re-entry. Relief of an attack of rhythm can be achieved by the administration of antiarrhythmic drugs of groups IA, IC and III. A meta-analysis of randomized controlled trials showed that the success in restoring sinus rhythm is higher in drugs of class IA (quinidine, procainamide and disopyramide), IC (flecainide and propafenone), III (amiodarone, sotalol, ibutilide, dofetilide) and it is 40–60% compared to the placebo group of 30%. If you are resistant to medication, the most optimal tactic is the operation of radiofrequency ablation. In our time, the procedure is used with the use of navigation systems, allowing to increase the success of the procedure from 50 to 90%. It is worth noting that the relief of an arrhythmia attack does not always indicate the success of the procedure, and the lack of information in the literature about the long-term results of treatment by radiofrequency ablation requires further study.