To study the feasibility, efficacy and safety of low-power greenlight laser vaporization and enucleation with end-fire fiber in the treatment of large-volume (>90 ml ) benign prostatic hyperplasia.

A retrospective analysis of 138 patients with benign prostatic hyperplasia volume greater than 90ml at Zhejiang Provincial People's Hospital from January 2016 to July 2018. The average age of the patients was (73.5±7.3) years and the average prostate volume was (110.2±23.7) ml, the median maximum urine flow rate before surgery was 5.3 (1.0-10.0)ml/s, and the median residual urine before surgery was 78.5 (51.6-108.5) ml. All patients underwent transurethral enucleation with greenlight laser vaporization and enucleation. The intraoperative vaporization power was 80 W and the optical fiber was end-fire fiber, the hemostasis power was 20 W. The optical fiber was straight out of the greenlight laser fiber. The combination of green laser vaporization and blunt dissection of the lens sheath was used to find the capsule, and the " three-leaf method" was used to enucleate the two and middle lobes of the prostate along the capsule level. After the enucleation, the tissues were pushed into the bladder, and the tissue morcellation was used. The tissue was crushed and removed after enucleation. After operation, an F20 three-cavity catheter was placed, and the balloon was filled with 50 ml of water. After 24 hours, the bladder was given a normal saline irrigation, and the catheter was removed 48 hours after the operation. Statistical analysis of these patients' baseline characteristics, perioperative results and complications.

The operation of 138 cases was successfully completed. The time of vaporization and enucleation was (58.6±6.1) minutes, and the time of morcellation was (12.6±5.6) minutes. Intraoperative and postoperative hemoglobin loss was (6.2±1.5) g/L, and no transfusion was required. Postoperative pain score(NRS) of 89 cases was 0, and 49 cases was 1. 123 patients who were removed catheter after 48 hours could urinate well, and 15 patients need re-catheterization. The catheter was removed again 7 days after surgery, and all patients returned to normal urination. Two cases of transient urinary incontinence occurred after the operation, both of which were urgent urinary incontinence. Both patients improved after oral tolterodine treatment and there was no stress urinary incontinence. There were 5 cases of urethral stricture after operation, all of which occurred 3 months after operation. They were cured after urethral stricture dilation or bladder neck orifice resection. The median maximum urinary flow rate was 17.5 (14-22) ml/s and the residual urine was 6.2 (2.7-11.3) ml in 1 month after operation, which were significantly different from preoperative parameters (P <0.05). The maximum urinary flow rate was 16.1 (13-20) ml/s at 3 months postoperatively and 17.3 (11-24) ml/s at 12 months postoperatively, and remained stable.

Low-power greenlight laser vaporization and enucleation in treating large-volume>90 ml has the advantages of short operation time, less pain, less blood loss, and quick recovery after surgery. The incidence of urinary incontinence and postoperative cardiovascular accident is low.

Prostatic hyperplasia; Laser surgery; Greenlight laser; Effect