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Microwave Ablation of Porcine Kidneys in vivo: Effect of two Different Ablation Modes (“Temperature Control” and “Power Control”) on Procedural Outcome

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Abstract

Purpose

This study was designed to analyze the effect of two different ablation modes (“temperature control” and “power control”) of a microwave system on procedural outcome in porcine kidneys in vivo.

Methods

A commercially available microwave system (Avecure Microwave Generator; MedWaves, San Diego, CA) was used. The system offers the possibility to ablate with two different ablation modes: temperature control and power control. Thirty-two microwave ablations were performed in 16 kidneys of 8 pigs. In each animal, one kidney was ablated twice by applying temperature control (ablation duration set point at 60 s, ablation temperature set point at 96°C, automatic power set point; group I). The other kidney was ablated twice by applying power control (ablation duration set point at 60 s, ablation temperature set point at 96°C, ablation power set point at 24 W; group II). Procedural outcome was analyzed: (1) technical success (e.g., system failures, duration of the ablation cycle), and (2) ablation geometry (e.g., long axis diameter, short axis diameter, and circularity).

Results

System failures occurred in 0% in group I and 13% in group II. Duration of the ablation cycle was 60 ± 0 s in group I and 102 ± 21 s in group II. Long axis diameter was 20.3 ± 4.6 mm in group I and 19.8 ± 3.5 mm in group II (not significant (NS)). Short axis diameter was 10.3 ± 2 mm in group I and 10.5 ± 2.4 mm in group II (NS). Circularity was 0.5 ± 0.1 in group I and 0.5 ± 0.1 in group II (NS).

Conclusions

Microwave ablations performed with temperature control showed fewer system failures and were finished faster. Both ablation modes demonstrated no significant differences with respect to ablation geometry.

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Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, INF 110, 69120, Heidelberg, Germany

    C. M. Sommer, V. Koch, B. Pap, M. Holzschuh, N. Bellemann, U. Stampfl, H. U. Kauczor & B. A. Radeleff

  2. Department of General, Abdominal and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany

    F. Arnegger, T. Gehrig, J. Senft & F. Nickel

  3. Department of General Pathology, University Hospital Heidelberg, Heidelberg, Germany

    C. Mogler

  4. Division of Medical and Biological Informatics, German Cancer Research Center, Heidelberg, Germany

    S. Zelzer & H. P. Meinzer

Authors
  1. C. M. Sommer
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  2. F. Arnegger
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  3. V. Koch
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  4. B. Pap
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  5. M. Holzschuh
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  6. N. Bellemann
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  7. T. Gehrig
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  8. J. Senft
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  9. F. Nickel
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  10. C. Mogler
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  11. S. Zelzer
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  12. H. P. Meinzer
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  13. U. Stampfl
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  14. H. U. Kauczor
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  15. B. A. Radeleff
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Corresponding author

Correspondence to C. M. Sommer.

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Sommer, C.M., Arnegger, F., Koch, V. et al. Microwave Ablation of Porcine Kidneys in vivo: Effect of two Different Ablation Modes (“Temperature Control” and “Power Control”) on Procedural Outcome. Cardiovasc Intervent Radiol 35, 653–660 (2012). https://doi.org/10.1007/s00270-011-0171-5

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  • DOI: https://doi.org/10.1007/s00270-011-0171-5

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