**5. EPhS with LV electroanatomical mapping**

Analyzing the results we decided to allocate the patients who underwent EPhS with electro‐ anatomical LVR before and after the surgery into separate groups. Fourty patients from the study group were included into group 1 and 38 from the control group into group 2. In the early postoperative period in the patients of group 1 the values of EPhS improved: "electri‐ cal scar" zones were found on endoventricular patch only, areas of lowered potential disap‐ peared completely, transient zones (from 0,5 to 1,5 mV) took a limited area without possibility of re-entry and VT induction (Figure 2).

In 2nd group patients spontaneous VT spells were registered by Holter monitoring in 6 cases; in 8 cases VT was induced during EPhS which made in total 37% of the patients. In 12 pa‐ tients cardioverters-defibrillators were implanted for the secondary prevention of a sudden cardiac death.
