Flow effect on lesion formation in RF cardiac catheter ablation

Hong Cao, Vicken R. Vorperian, Supan Tungjitkusolmun, Jang Zern Tsai, Dieter Haemmerich, Young Bin Choy, John G. Webster

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

This study investigated the flow effect on the lesion formation during radio-frequency cardiac catheter ablation in temperature-controlled mode. The blood flow in heart chambers carries heat away from the endocardium by convection. This cooling effect requires more power from the ablation generator and causes a larger lesion. We set up a flow system to simulate the flow inside the heart chamber. We performed in vitro ablation on bovine myocardium with three different flow rates (0 L/min, 1 L/rain and 3 L/min) and two target temperatures (60 °C and 80 °C). During ablation, we also recorded the temperatures inside the myocardium with a three-thermocouple temperature probe. The results show that lesion dimensions (maximum depth, maximum width and lesion volume) are larger in high flow rates (p < 0.01). Also, the temperature recordings show that the tissue temperature rises faster and reaches a higher temperature under higher flow rate.

Original languageEnglish
Pages (from-to)425-433
Number of pages9
JournalIEEE Transactions on Biomedical Engineering
Volume48
Issue number4
DOIs
StatePublished - 2001

Keywords

  • Ablation
  • Cardiac catheter ablation
  • Convection film coefficient
  • Lesion dimension
  • RF cardiac catheter ablation
  • Temperature recording

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