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Pathologic changes following transurethral canine prostatectomy with a cylindrically diffusing fiber

D M Cromeens1, R E Price, D E Johnson

  • 1Department of Veterinary Medicine and Surgery, University of Texas M.D. Anderson Cancer Center, Houston 77030.

Lasers in Surgery and Medicine
|January 1, 1994
PubMed
Summary
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Transurethral laser prostatectomy using a novel cylindrically diffusing fiber and Nd:YAG laser showed promising results in dogs. This technique facilitated prostate tissue destruction and subsequent healing with minimal complications.

Area of Science:

  • Urology
  • Veterinary Surgery
  • Laser Medicine

Background:

  • Transurethral prostatectomy is a common procedure for benign prostatic hyperplasia.
  • Current laser techniques face challenges with fiber placement and tissue ablation control.

Purpose of the Study:

  • To evaluate the efficacy and safety of transurethral laser prostatectomy using a cylindrically diffusing fiber with a Nd:YAG laser in a canine model.
  • To assess the histopathological changes and healing process following the procedure.

Main Methods:

  • Eight mongrel dogs underwent transurethral laser prostatectomy using a 1.06 μm Nd:YAG laser and a cylindrically diffusing fiber.
  • A total of 15,000 joules of laser energy was delivered continuously (25 watts for 10 minutes).
  • Prostate tissues were examined grossly and histopathologically at various intervals from 2 hours to 7 weeks post-procedure.

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Main Results:

  • A spherical zone of prostatic destruction (average 2.8 cm diameter) was observed in most dogs.
  • Histopathology revealed acute coagulative necrosis, progressing to hemorrhage and liquefaction within the first week.
  • Epithelialization of the treated cavity began at 3 weeks and was nearly complete by 7 weeks.

Conclusions:

  • The cylindrically diffusing fiber system offers simplified placement and a lack of postoperative complications in this canine model.
  • This technique shows potential advantages over laterally deflecting fibers for transurethral prostatectomies.
  • Further research is warranted to explore its clinical applicability in human patients.