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Conclusion

  • The wet electrode technique increases the total electrode surface area with improved thermal and electrical conductivity.
  • Two mechanisms have been proposed to account for the improved tissue heating and increased RF-induced coagulation with simultaneous saline infusion:
    1/ that NaCl alters tissue properties such as electrical conductivity to permit greater RF energy deposition, or
    2/ that the infusion of fluid during RF application improves the thermal conduction within the tissues by more rapidly and effectively convecting heat over a larger tissue volume.
  • NaCl concentration had significant but nonlinear effects on electrical conductivity, RF deposition, and heating.
  • Injection of NaCl solution during RF ablation can increase energy deposition, tissue heating, and induced coagulation.

This method allows avoidance of desiccation and impedance rises and allows treatment of larger lesion sizes. Also with a low electrode cost, this coagulation method proved to be very cost efficient as well and easy to use.