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Renal cryotherapy in a sheep model; a feasibility study

P J Cozzi1, W J Lynch, S Collins

  • 1University Department of Surgery, University of New South Wales, St. George Hospital, Sydney, Australia.

The Journal of Urology
|February 1, 1997
PubMed
Summary
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Renal cryotherapy is a safe and effective treatment for renal malignancy, preserving kidney tissue. This study in sheep demonstrated successful necrosis with no complications.

Area of Science:

  • Nephrology
  • Surgical Oncology
  • Minimally Invasive Procedures

Background:

  • Renal malignancy poses a significant challenge in treatment.
  • Preservation of renal parenchyma is crucial for maintaining kidney function.
  • Cryotherapy offers a potential minimally invasive approach for renal tumor ablation.

Purpose of the Study:

  • To evaluate the safety and efficacy of renal cryotherapy.
  • To assess its potential for treating renal malignancy while preserving kidney tissue.

Main Methods:

  • Ten Merino sheep underwent anesthesia and retro-peritoneal surgery.
  • A 5 mm cryotherapy probe was used to create a 5 cm iceball in the kidney.
  • Animals were euthanized at 4 weeks for necropsy and histological examination.

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Main Results:

  • No mortality or complications were observed.
  • A transient increase in creatinine levels was noted post-operatively.
  • Necropsy revealed a 3 cm fibrotic lesion with central coagulative necrosis and partial necrosis at the rim, preserving renal tubules.

Conclusions:

  • Renal cryotherapy is a safe procedure in a sheep model.
  • The technique effectively achieves renal necrosis.
  • This supports further investigation into renal cryotherapy for renal malignancy.