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J Urol. 2000 Jun;163(6):1730-3.

High power potassium-titanyl-phosphate laser vaporization prostatectomy.

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  • 1Department of Urology, Mayo Clinic and Mayo Foundation, Rochester, Minnesota, USA.



We prospectively studied a cumulative cohort of men with obstructive benign prostatic hyperplasia who underwent potassium-titanyl-phosphate (KTP) laser vaporization prostatectomy to determine the safety and efficacy of this procedure.


A total of 55 men with symptomatic bladder outlet obstruction due to benign prostatic hyperplasia were treated with a 60 W. KTP laser produced by a prototype Laserscopedagger generator and delivered through a side-deflecting fiber with a 22Fr continuous flow cystoscope. Sterile water was used for irrigation. The prostatic lobes were vaporized to within capsular fibers. Mean lasing time plus or minus standard deviation was 44 +/- 19 minutes.


Mean prostate volume plus or minus standard deviation was 43 +/- 14 ml. No patient had any significant blood loss or fluid absorption, or required blood transfusion. Foley catheters did not require irrigation and were removed less than 24 hours postoperatively. All patients remained satisfied with voiding outcome, which changed significantly (p <0.0001). Mean improvement in American Urological Association symptom score at 3, 6, 12 and 24-month intervals was 75%, 79%, 82% and 82%, respectively. Mean increase in peak flow rate at the same intervals was 250%, 242%, 255% and 278%, respectively. Complications included mild transient dysuria in 7%, bladder neck contracture in 2% and delayed hematuria in 4% of patients. None of the patients required re-catheterization or reoperation, or had incontinence or newly developed impotence. Of the sexually active patients 15% and 9% had retrograde ejaculation at 1 and 2 years, respectively.


Our observation in a 2-year period indicates that 60 W. KTP laser vaporization prostatectomy is safe and effective for quickly relieving bladder outlet obstruction with minimal postoperative complications, a high rate of patient satisfaction and, to date, a generally good outcome.

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