The publication discusses clinical course and treatment of cardiac arrhythmias after coronary artery bypass grafting with aneurysmectomy. The clinical case is presented in which ventricular arrhythmias evident before
revascularization and aneurysmectomy were not registered anymore after operation. At the same time, paroxysms of atrial fibrillation and flutter appeared in early postoperation period. Radiofrequency catheter
ablation of cavotricuspidal isthmus interrupted atrial flutter. This was associated with favourable course of atrial fibrillation at long-term observation.