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Updated: Aug 29, 2025

Focal Laser Ablation of Prostate Cancer: An Office Procedure
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Nerve Protection During Prostate Cryosurgery.

Pegah Ranjbartehrani1, David A Ramirez2, Franz Schmidlin3

  • 1Department of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, MN, 55455, USA.

Annals of Biomedical Engineering
|September 10, 2022
PubMed
Summary

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This summary is machine-generated.

Cryoprotective agents (CPAs) can protect nerves near the prostate during cryosurgery. This research shows specific CPAs preserve nerve function, potentially preventing erectile dysfunction after prostate cancer treatment.

Area of Science:

  • Urology
  • Neurosurgery
  • Biomedical Engineering

Background:

  • Cryosurgery is a focal prostate cancer (PCa) treatment.
  • Cryoinjury to the neurovascular bundle (NVB) can cause erectile dysfunction.
  • Preserving nerve function during cryosurgery is crucial for patient quality of life.

Purpose of the Study:

  • To evaluate cryoprotective agents (CPAs) for preventing nerve damage during prostate cryosurgery.
  • To assess the efficacy of CPAs in preserving action potential (AP) conduction in nerves exposed to freezing.

Main Methods:

  • Modeled a cryosurgical procedure using clinical data.
  • Applied CPAs to ex-vivo porcine phrenic and rat sciatic nerves.
  • Measured APs before, after CPA exposure, and during 3 hours of recovery.
Keywords:
Action potentialCryoinjuryCryoprotectionErectile dysfunctionFocal therapyNeural conductionNeurovascular bundle

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Main Results:

  • Certain CPAs (e.g., 5% DMSO + 7.5% Trehalose, 5% M22) showed minimal toxicity.
  • Effective cryoprotection was observed, with significant AP recovery (48% for porcine, 30% for rat nerves).
  • Specific CPA compositions demonstrated superior cryoprotective capabilities.

Conclusions:

  • Properly selected and deployed CPAs can preserve neural conduction after freezing.
  • This approach offers a promising strategy to mitigate nerve damage in prostate cryosurgery.
  • Minimizing non-recoverable loss of AP conduction may prevent erectile dysfunction and improve patient outcomes.