The effect of increased maximum power output on perioperative and early postoperative outcome in photoselective vaporization of the prostate


  • Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and have disclosed the following: A.B. is consultant for American Medical Systems (AMS) and Principal Investigator of a study comparing Photoselective Vaporization of the Prostate with the GreenLight XPS™ laser system and transurethral resection of the prostate for the treatment of benign prostatic hyperplasia (The Goliath Study), H.P. is study nurse and partly paid by AMS. The other authors have nothing to disclose.


Background and Objective

Preclinical studies suggest an increased vaporization rate and speed of the 532 nm 180-W XPS GreenLight laser (180-W) compared with the 120-W HPS GreenLight laser (120-W) and the 80-W PV GreenLight laser (80-W). To test the clinical relevance of this observation we analyzed intraoperative data and early postoperative results after photoselective vaporization of the prostate (PVP) with the 180-W, 120-W, and 80-W laser.

Study Design/Materials and Methods

A retrospective pair-to-pair comparison was performed including 80 consecutive patients who underwent PVP for the treatment of benign prostate enlargement with the 180-W, 120-W, and 80-W laser. The groups matched concerning age, prostate volume, PSA-value, and preoperative catheterization. Primary study outcome measurement was PSA-value reduction at 3 months; intraoperative data, perioperative complications, and early postoperative functional course were secondary study outcome measurements.


Energy application per case (kJ), preoperative prostate volume (kJ/ml) operating time (kJ/minute), and lasing time (kJ/minute) was significantly higher with the 180-W laser. Prevalence of impaired visibility due to bleeding was comparable between the 180-W and the 120-W laser but significantly lower with 80-W. Duration of hospitalization was shorter with the 180-W laser compared to the former laser systems. During the postoperative course of 3 months voiding parameters and micturition symptoms significantly improved in all groups, the incidence of postoperative dysuria was comparable. Postoperative PSA-value reduction was significantly higher after treatment with the 180-W laser.


With the 180-W laser, higher energy application and higher speed of tissue vaporization leads to increased tissue vaporization compared to the former 120-W and 80-W laser systems. Clinical efficacy and perioperative safety are maintained with the higher powered laser. Lasers Surg. Med. 45: 28–33, 2013. © 2012 Wiley Periodicals, Inc.