View from the ventricles. Isopotential maps. Area of negative potential moves counterclockwise.
Polygonal endo-epicardial atrial model. Phase maps. View of the side of the ventricles.To build an isochronous map, in the phase compound of electrogram there was selected an interval between phase leaps corresponding to the reentry cycle duration (Fig. 3).
After switching to the isochronous map mode there was obtained an isochronous map by the method of phase mapping. The process of activation spread (from red to purple) corresponds to the wave movement reentry counterclockwise.
The patient was exposed to an invasive electrophysiological heart investigation using the CARTO III navigation system. Mapping of the right atrium was performed in the rhythm of atrial flutter, then a mapping electrode was moved into the left atrium by transseptal access, and the left atrium was mapped. There was revealed a typical rotation of the reentry wave around the tricuspid valve with a typical delay in the region of cavo-tricuspid isthmus. Activation maps obtained during an invasive EPI perfectly matched activation maps obtained during a Non-invasive investigation using the «AMYCARD 01C» system.
There was performed an ablation of cavo-tricuspid isthmus. During repeated mapping of the right atrium in the rhythm of cardiac stimulation from the coronary sinus there were not revealed activation breaks through the ablation line.
During postoperative period of 6 months no recurrent of atrial flutter were observed.