Creation of an Ex Vivo Renal Perfusion Model to Investigate Microwave Ablation

Carlos B. Ortiz, Annie Dang, Kade Derrick, Barrett O'Donnell, Ryan Bitar, Matthew Parker, Rafael Veraza, Leonid Bunegin, Marina Borrego, Seiji Yamaguchi, John A. Walker, Jorge Lopera

Research output: Contribution to journalArticlepeer-review


This study hypothesized that an ex vivo renal perfusion model can create smaller microwave ablation (MWA) measurements during perfused states compared with nonperfused states across multiple device settings. Nine bovine kidneys, a fluoroscopic compatible perfusion model, and a commercially-available clinical MWA system were used to perform 72 ablations (36 perfused and 36 nonperfused) at 9 different device settings. Comparing perfused and nonperfused ablations at each device setting, significant differences in volume existed for 6 of 9 settings (P < .05). Collapsed across time settings, the ablation volumes by power were the following (perfused and nonperfused, P value): 60 W, 2.3 cm3 ± 1.0 and 7.2 cm3 ± 2.7, P < .001; 100 W, 5.4 cm3 ± 2.1 and 11.5 cm3 ± 5.6, P < .01; and 140 W, 11.2 cm3 ± 3.7 and 18.7 cm3 ± 6.3, P < .01. Applied power correlated with ablation volume: perfused, 0.021 cm3/W and R = 0.462, P = .004, and nonperfused, 0.029 cm3/W and R = 0.565, P < .001. These results support that an ex vivo perfused organ system can evaluate MWA systems and demonstrate heat sink perfusion effects of decreased ablation size.

Original languageEnglish (US)
Pages (from-to)40-45.e2
JournalJournal of Vascular and Interventional Radiology
Issue number1
StatePublished - Jan 2023
Externally publishedYes

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine


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