The aim of the study was to estimate destruction effect to different heart structures using laser methodology in animal (pig) model. Ablation procedure was performed on right and left pulmonary veins area inserting electrode through a. femoralis or incision in right/left auricle. The effects of ablation were observed visually and temperature controlled by thermography camera P640 (FLIR Systems, USA). Using standard recommended parameters 40W/180 sec and 35W/120 sec evoked quick critical scar formation. Temperature in cardiac surface differs from 34.5 till 70.2 º C and directly depends from electrode compression level and energy power. Optimal detected ablation parameters -20-30W/120 sec. BackgroundRecently most of the cardiac rhythm disorders are corrected by transvenous way, using radiofrequency, microwave, laser energies or cryoablation. In over then 20 years of clinical experience, catheter radiofrequency ablation (RFA) has been standard and mostly developed approach. Unfortunately, despite of increased experience and using modern RFA technologies short-and long-range postoperative complications and relapses fluctuate from 0,5 to 14 percent