Clinical Scorecard: Evaluation of Temperature Changes in an Ex Vivo Model of Holmium Laser Enucleation for Prostate Surgery

At a Glance

Key Highlights

• HoLEP is a minimally invasive alternative to TURP and open prostatectomy with superior outcomes and fewer complications.
• Holmium:YAG laser energy is absorbed by water in prostate tissue, producing low penetration depth (~0.4 mm) and localized heat.
• Ex vivo experiments measured temperature changes during HoLEP under varying irrigation flow rates and cavity volumes to assess heat generation.

Guideline-Based Recommendations

Diagnosis

• Use standard clinical and imaging assessments to determine prostate size and suitability for HoLEP.

Management

• Perform HoLEP using Ho:YAG laser at 80 W power with continuous irrigation to minimize thermal injury.
• Maintain irrigation flow rates around 400 ml/min to simulate physiological convection and reduce heat accumulation.
• Use monopolar coagulation with sprayCOAG® settings for vessel haemostasis post-enucleation.

Monitoring & Follow-up

• Monitor temperature changes during laser application to prevent excessive heat buildup (>60 °C) in prostate tissue.
• Utilize temperature probes or thermal imaging in experimental or training settings to assess thermal effects.

Risks

• Potential thermal injury to surrounding tissue if irrigation flow is insufficient or laser energy is excessive.
• Necrosis depth varies with coagulation power settings; careful control needed to avoid excessive tissue damage.

Patient & Prescribing Data

Patients undergoing HoLEP for prostate enlargement

Laser parameters and irrigation flow rates should be optimized to balance effective tissue enucleation with minimal thermal damage.

Clinical Best Practices

• Use continuous irrigation at approximately 400 ml/min during HoLEP to simulate physiological blood flow and dissipate heat.
• Apply Ho:YAG laser at standardized settings (80 W, 4 J pulse energy, 400 µs pulse duration) for consistent outcomes.
• Employ monopolar coagulation with appropriate power settings for effective haemostasis while minimizing necrosis depth.
• Consider ex vivo or simulation models for training and evaluation of thermal effects during HoLEP.

References

• Holmium Laser Enucleation of the Prostate (HoLEP) Overview
• Laser-Tissue Interaction and Temperature Effects in HoLEP
• Irrigation Flow and Thermal Safety in Prostate Surgery