Isopotential map revealed concentrically spreading area of negative potential in the right atrium in the region of coronary sinus, testifying the location of ectopic focus in this part of the atriums (Fig. 2).
To determine the sequence of the atrium activation dichromatic maps in the FND mode were built (Fig. 3), maps of myocardium activation direction (Fig. 4), isochronous maps and maps of activation spread in the ADM mode (Fig. 5).
When switching to "map the spread of excitation" was to get a picture of the spread of excitation from the region of the coronary sinus.
Thus, various methods of activation mapping confirmed the localization of ectopic focus in the right atrium in the coronary sinus region.
Conducted invasive ESH of the heart confirmed the localization of the ectopic focus. The patient underwent a successful radiofrequency ablation. In the postoperative period, according to Holter monitoring, a stable sinus rhythm was observed.