Destructive energy impact to the myocard damage: between technological advantages and risk

Background: The aim of the study was to evaluate and compare destruction effect to different heart structures using RF, cryo and laser methodology in animal (pig) model. Methods: Ablation procedure was performed on right and left pulmonary veins area, free wall of right and left atrias, and free wall of ventricles positioning ablation electrode from endocardial side. Ablation electrodes were inserted through an incision in right/left auricle. The effects of ablation were observed visually and using thermography for temperature control. Results: Standard recommended parameters for both of used destruction energies were possible to evoke quick critical scar formation and rupture. Temperature in cardiac surface differs from 34.5 till 70.2 °C, and directly depends from electrode compression level, time of application and energy power. We express dissent from the general view, what destruction in cardiac structures is point like. We observed enough high range of temperature dispersion, especially in ventricles. Conclusions: Usage of thermography enable to estimate peculiarities and borders of destruction site, optimize parameters of ablation, allows us to avoid or minimize undesirable effects, save structures and improve clinical outcomes

Electric conductivity studies of composites based on (Cu₁₋xAgx)₆PS₅I superionic conductors

The composites based on superionic (Cu₁₋xAgx)₆PS₅I solid solutions were prepared by mixing of microcrystalline powder with polyvinylacetate glue. The temperature and frequency behaviour of the total electric conductivity of composites within the frequency range 1.0*10⁶ –1.2*10⁹ Hz and temperature range 300 to 420 K were investigated. The linear increase of the total electric conductivity with temperature increase was revealed, as well as the influence of Cu->Ag cation substitution on electrical properties of (Cu₁₋xAgx)₆PS₅I composites was studied