Catheter Ablation -> Atrial Fibrillation & Atrial Flutter: -> Ablation Techniques D-PO01 - Featured Poster Session (ID 11) Poster

D-PO01-163 - The Presence Of Metal Microelectrodes On An Esophageal Temperature Probe Does Not Alter Esophageal Temperature During Radiofrequency Ablation (ID 121)


Background: Proper positioning of an esophageal temperature probe without fluoroscopy requires the probe to have metal electrodes to be identified by a 3-dimensional mapping system.
Objective: To determine whether metal electrodes attached to a temperature probe would affect esophageal heating during radiofrequency ablation.
Methods: Our ex vivo model for esophageal heating consisted of porcine esophageal tissue with an overlying fascial layer submerged in a saline bath. Using a TactiCath (Abbott) force sensing catheter, we performed a series of radiofrequency ablation lesions at variable powers and duration at 10 g and 20 g force. Temperatures were measured with insulated thermocouple wires placed directly below the RFA electrode and overlying the temperature probe with and without a metal microelectrode (S-Cath and S-Cath M, Circa Scientific) and with esophageal tissue interposed.
Results: There were no significant differences in the measured temperatures on sensors adjacent to embedded metal microelectrodes compared to those without nearby metal (mean temperature rise 10.85 +/- 4.2 °C vs. 12.9 +/- 4.1 °C; p=0.11; time to 1°C rise 4.2 +/- 1.5 s vs. 4.9 +/- 2.1 s; p=0.27). The peak temperature rise and slope of temperature escalation were similar in the temperature probes with and without metal electrodes attached (Figure).
Conclusion: Metal electrodes attached to the esophageal temperature probe did not significantly alter esophageal temperatures during radiofrequency ablation. These findings suggest that use of metal electrodes to identify the position of the esophageal temperature probe using 3-dimensional mapping does not significantly increase esophageal heating.