title: Photoselective vaporization of the prostate: initial experience with a new 80 W KTP laser for the treatment of benign prostatic hyperplasia.
abstract: OBJECTIVE
  To study the safety and efficacy of a new high-power potassium-titanyl-phosphate laser (KTP/532; Niagara PV trade mark laser system; Laserscope, San Jose, CA) for transurethral photoselective vaporization of benign obstructive prostate tissue.
  
  
  METHODS
  The KTP/532 laser energy at 80 W was delivered by a 6F side-firing fiber through a 23F continuous-flow cystoscope. Photoselective vaporization of the prostate (PVP) using sterile water irrigation was performed under spinal anesthesia on an outpatient basis in 10 patients with a preoperative mean prostate volume of 41.37 +/- 18.5 cc (range 24-76.3 cc). The mean lasing time was 19.8 +/- 4.9 minutes.
  
  
  RESULTS
  Two patients experienced 1 to 7 days of mild dysuria, and one who was taking warfarin had mild transient hematuria, but none had urinary retention or other complications. The mean catheterization time was 17.2 +/- 9.6 hours (range 0-28 hours). At 1 year, the outcomes, which had showed significant improvement sustained throughout the follow-up, were as follows: mean American Urological Association Symptom Score decreased from 23.2 +/- 4.7 to 2.6 +/- 0.5 (88.8%), the mean quality of life score improved from 4.3 +/- 0.7 to 0.4 +/- 0.5 (90.7%), the mean peak urinary flow rate increased from 10.3 +/- 1.4 mL/sec to 30.7 +/- 5.8 mL/sec (198.1%), and the mean postvoiding residual volume decreased from 137.6 +/- 112.2 mL to 3.0 +/- 4.8 mL (97.8%). The mean prostate volume decreased by 27%.
  
  
  CONCLUSIONS
  This pilot study indicates that PVP with the new 80 W KTP/532 laser is a simple, safe, and efficacious outpatient procedure for the treatment of obstructive BPH.
authors.affiliation: Department of Urology, Oakwood Annapolis Hospital, Wayne, Michigan, USA.
authors.forename: Mahmood A
authors.initials: MA
authors.lastname: Hai
authors.forename: Reza S
authors.initials: RS
authors.lastname: Malek
mesh_terms: D000368:Aged; D006801:Humans; D053685:Laser Therapy / Q000009:adverse effects / Q000295:instrumentation*; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D011183:Postoperative Complications; D011470:Prostatic Hyperplasia / Q000503:physiopathology / Q000601:surgery*; D011788:Quality of Life; D020728:Transurethral Resection of Prostate / Q000379:methods; D014554:Urination; D014563:Urodynamics