Abstract 17516: Use of an Infrared Probe Enhances Esophageal Temperature Monitoring during Left Atrial Radiofrequency Ablation
Introduction: Atrial-esophageal fistula is a rare but potentially fatal complication of esophageal heating during catheter ablation for atrial fibrillation. Currently available esophageal temperature probes are limited in that they cover a small area and measure only luminal temperature. We hypothesized that a scanning infrared probe would be more sensitive to ablation-related esophageal heating than a conventional probe.
Methods: Radiofrequency ablations were performed in areas of the posterior left atrium overlying the esophagus in three swine. Esophageal temperature was simultaneously monitored using infrared and conventional probes placed adjacent to the ablation site.
Results: The infrared probe measured esophageal tissue temperature in an area considerably larger than the area covered by the conventional probe. The average measured temperature increase during ablation (40 watts, 45 seconds) was greater with the infrared probe (4.4 ± 1.4 degrees C) than with the conventional probe (2.4 ± 1.6 degrees C). This difference was statistically significant (P < 0.0001, n = 17). Maximum temperature was reached in an average of 43.5 ± 4.2 seconds with the infrared probe and 53.8 ± 16.4 seconds with the conventional probe (P = 0.0189, n = 17). Return to baseline temperature took an average of 88.8 ± 36.4 seconds with the infrared probe and 233.2 ± 89.4 seconds with the conventional probe (P < 0.0001, n = 17).
Conclusions: The infrared esophageal temperature probe described in this study provides a larger detection area than the conventional probe, and is also more sensitive to the magnitude and time course of temperature change during ablation.
- © 2012 by American Heart Association, Inc.