Design and Analysis of Experiments, 9th Edition (PDF)

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PURPOSE: To our knowledge we report the first single center, prospective, randomized study comparing holmium laser enucleation and high performance GreenLight™ prostate photoselective vaporization as surgical treatment of prostatic adenomas greater than 60 ml. MATERIALS AND METHODS: A total of 80 patients with a large prostatic adenoma were randomly assigned to surgical treatment with holmium laser enucleation or photoselective vaporization. International Prostate Symptom Score, International Index of Erectile Function-15, maximum flow rate, post-void residual urine, serum prostate specific antigen and transrectal ultrasound volume were recorded. RESULTS: Patient baseline characteristics were similar for holmium laser enucleation and photoselective vaporization. Operative time and catheter removal time were almost equal in the 2 groups (p = 0.7 and 0.2, respectively). Eight vaporization cases were converted to transurethral prostate resection or holmium laser enucleation intraoperatively due to bleeding. A significantly higher maximum flow rate and lower post-void residual urine were noted in holmium laser cases during the entire followup (at 1 year each p = 0.02). However, no significant difference in International Prostate Symptom Score, quality of life or International Index of Erectile Function-15 was detected. Prostate volume and serum PSA decreased 78% and 88% in the holmium laser group, and 52% and 60% in the vaporization group, respectively. CONCLUSIONS: Holmium laser enucleation and photoselective vaporization are effective for lower urinary tract symptoms due to a large prostatic adenoma. Early subjective functional results (maximum flow rate and post-void residual urine) of holmium laser enucleation appear to be superior to those of photoselective vaporization. In our hands cases intended to be treated with photoselective vaporization were at 22% risk of conversion to another modality. This could reflect our determination to vaporize to the capsule in all vaporization cases.  

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