To determine whether total energy (TE) reaching the microwave (MW) applicator or net energy (NE) exiting the applicator (after correcting for reflectivity) correlates better with hepatic MW ablation zone dimensions than manufacturer-provided chart predictions.
Shyn, Paul B Bird, Jeffery R Koch, R Marie Tatli, Servet Levesque, Vincent M Catalano, Paul J Silverman, Stuart G Hepatic Microwave Ablation Zone Size: Correlation with Total Energy, Net Energy, and Manufacturer-Provided Chart Predictions. Microwave ablation with high-power triaxial antennas created larger ablation zones in normal porcine kidneys than RF ablation with similarly sized applicators. Tissue temperatures were higher during microwave ablation (maximum temperature of 123 degrees C vs 100 degrees C for RF). Ablation zone circularity was similar across groups (P >. No significant differences were detected between single-antenna microwave and multiple-electrode RF. Three-electrode RF (mean area, 14.7 cm(2)) and single-antenna microwave (mean area, 10.9 cm(2)) ablation zones were significantly larger than single-electrode RF zones (mean area, 5.6 cm(2) P =. No adverse events occurred during the procedures. Comparisons between groups were performed with use of a mixed-effects model with P values less than. Animals were euthanized after ablation and ablation zone diameter, cross-sectional area, and circularity were measured. Temperatures 1 cm from the applicator were measured during two RF and microwave ablations each. Multiple antennas were powered simultaneously. Microwave ablations were performed with one (n = 7), two (n = 3), or three (n = 2) 17-gauge triaxial antennas to deliver 90 W continuous power per antenna. RF ablations were performed with a 200-W pulsed generator and either a single 17-gauge cooled electrode (n = 9) or three switched electrodes spaced 1.5 cm apart (n = 7). Twenty-eight 12-minute ablations were performed in an in vivo porcine kidney model.
To determine whether microwave ablation with high-power triaxial antennas creates significantly larger ablation zones than radiofrequency (RF) ablation with similarly sized internally cooled electrodes.
Laeseke, Paul F Lee, Fred T Sampson, Lisa A van der Weide, Daniel W Brace, Christopher L Microwave ablation versus radiofrequency ablation in the kidney: high-power triaxial antennas create larger ablation zones than similarly sized internally cooled electrodes.
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