Vol. 20 No. 1 (2016)
HEART RHYTHM DISORDERS

Relationship between depth of RF destruction of myocardium and initial tissue resistance under various temperature conditions

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  • A. Evtushenko,
  • V. Evtushenko,
  • K. Smyshlyaev,
  • A. Bykov,
  • Yu. Kistenev,
  • Ya. Anfinogenova,
  • E. Pavlyukova,
  • I. Kurlov,
  • S. Popov
A. Evtushenko
Federal Research Institute for Cardiology, 111a Kiyevskaya St., 634012 Tomsk; National Research Tomsk State University, 36 Lenina Avenue, 634050 Tomsk
V. Evtushenko
Federal Research Institute for Cardiology, 111a Kiyevskaya St., 634012 Tomsk; National Research Tomsk State University, 36 Lenina Avenue, 634050 Tomsk
K. Smyshlyaev
Federal Research Institute for Cardiology, 111a Kiyevskaya St., 634012 Tomsk
A. Bykov
National Research Tomsk State University, 36 Lenina Avenue, 634050 Tomsk
Yu. Kistenev
National Research Tomsk State University, 36 Lenina Avenue, 634050 Tomsk
Ya. Anfinogenova
Federal Research Institute for Cardiology, 111a Kiyevskaya St., 634012 Tomsk
E. Pavlyukova
Federal Research Institute for Cardiology, 111a Kiyevskaya St., 634012 Tomsk
I. Kurlov
Federal Research Institute for Cardiology, 111a Kiyevskaya St., 634012 Tomsk
S. Popov
Federal Research Institute for Cardiology, 111a Kiyevskaya St., 634012 Tomsk
DOI: https://doi.org/10.21688/1681-3472-2016-1-35-39

Published 2016-03-25

Keywords

  • conductivity,
  • impedance,
  • temperature,
  • radiofrequency energy,
  • myocardium

How to Cite

Evtushenko, A., Evtushenko, V., Smyshlyaev, K., Bykov, A., Kistenev, Y., Anfinogenova, Y., Pavlyukova, E., Kurlov, I., & Popov, S. (2016). Relationship between depth of RF destruction of myocardium and initial tissue resistance under various temperature conditions. Patologiya Krovoobrashcheniya I Kardiokhirurgiya, 20(1), 35–39. https://doi.org/10.21688/1681-3472-2016-1-35-39

Copyright (c) 2016 Evtushenko A. V., Evtushenko V. V., Smyshlyaev K. A., Bykov A. N., Kistenev Yu. V., Anfinogenova Ya. D., Pavlyukova E. N., Kurlov I. O., Popov S. V.

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Objective

The aim of the study is to analyze the efficacy of RF ablation at different temperature conditions of the surgical area.

Methods

20 isolated hearts were studied. To evaluate the effectiveness of radio frequency exposure, use was made of two temperature settings: myocardial normothermia (36.6 °C) and myocardial hypothermia (20 °C). The hearts were placed on the electrophysiology bench heated to 36.6 °C; the ablation depth and temperature of the epicardium, endocardium and myocardium at the exposed points were then measured and evaluated. Tissue impedance was measured before and after RF ablation. RF energy was applied by means of a 40 W unipolar irrigated ball electrode over a period of 7 s.

Results

It was found out that under hypothermia the myocardium has low resistance which hinders adequate heating of its deep layers and in this connection there arises a high risk for recovery of cardiomyocyte membrane potentials and for retention of their function.

Conclusion

When the ablation time in both temperature settings is the same, RF exposure at low temperatures causes a lesser depth of damage.

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