Perioperative Outcomes of Pulsed Tm:YAG vs Holmium:YAG Laser in Prostate Enucleation

Overview

This study compared perioperative outcomes of endoscopic enucleation of the prostate (EEP) using a novel pulsed solid-state Thulium:YAG (Tm:YAG) laser versus the standard Holmium:YAG (Ho:YAG) laser in patients with benign prostatic hyperplasia (BPH). Multivariable regression analysis adjusted for key covariates demonstrated differences in enucleation efficiency and tissue effects between the two laser modalities.

Background

Benign prostatic hyperplasia is a common condition in aging men causing lower urinary tract symptoms. Surgical management has evolved from TURP and open prostatectomy to endoscopic enucleation of the prostate (EEP), now a guideline-recommended standard regardless of prostate size. The Holmium:YAG laser has been widely used for EEP due to its safety and efficacy. Recently, a pulsed solid-state Thulium:YAG laser with higher peak power and distinct physical properties has emerged as a promising alternative, potentially offering improved tissue ablation and reduced thermal damage.

Data Highlights

Key Findings

• The pulsed Tm:YAG laser operates at a wavelength of 2013 nm with a peak power of 3,700 W, closer to the water absorption peak, potentially enhancing ablation efficiency.
• Compared to Ho:YAG, pulsed Tm:YAG showed lower tissue penetration and less thermal damage, with larger cavitation bubbles facilitating enucleation.
• Multivariable regression adjusted for age, ASA score, hemoglobin, prostate volume, and PSA levels to compare perioperative outcomes between groups.
• Both laser techniques used the same en-bloc three-incision technique performed by experienced surgeons, ensuring procedural consistency.
• Pulsed Tm:YAG laser demonstrated little to no carbonization in tissue models, contrasting with carbonization seen in other thulium laser types.
• Perioperative parameters including enucleation time, laser energy used, catheterization duration, and hospitalization were systematically recorded and analyzed.

Clinical Implications

The pulsed solid-state Tm:YAG laser represents a promising alternative to the standard Ho:YAG laser for prostate enucleation, potentially offering more efficient tissue ablation with reduced thermal injury. Its use may translate into improved perioperative outcomes such as shorter enucleation times and less postoperative tissue damage. Clinicians should consider the distinct physical and operational characteristics of this laser when selecting surgical modalities for BPH treatment.

Conclusion

This comparative analysis supports the pulsed Tm:YAG laser as an effective and safe option for EEP in BPH patients, combining advantages of both Ho:YAG and thulium fiber lasers. Further prospective studies are warranted to confirm these findings and define long-term clinical benefits.

References

1. Fraundorfer and Gilling 1998 -- Introduction of HoLEP
2. Current Guidelines 2023 -- EEP as Standard Procedure
3. Dornier MedTech Systems -- Thulio® Laser Technical Data
4. SPSS and R Statistical Software Documentation