[Clinical study of "point-line-surface-volume" four dimensional holmium laser enucleation of prostate for benign prostatic hyperplasia].

Objective: To investigate application value of "point-line-surface-volume" four dimensional holmium laser enucleation of prostate (HoLEP) in the treatment of benign prostatic hyperplasia (BPH). Methods: From December 2016 to November 2017, the clinical data of 60 cases of BPH with the treatment of "Point-line-surface-volume" four dimensional HoLEP at Department of Urology, Peking University Third Hospital were analyzed retrospectively. The age was (73.8±8.0) years (range: 60 to 96 years), body mass index was (23.2±3.6) kg/m(2) (range: 14.9 to 31.1 kg/m(2)), volume of prostate was (64.5±36.9) ml (range: 15.5 to 197.9 ml). All the cases were operated by the same chief surgeon expert in endoscopic surgery. First of all, taking verumontanum as the anchor point, crossing point between the outer 45° line of verumontanum and middle line of the lateral lobe and verumontanum was made as the breakthrough point. The "blasting and paddling" method was used to find prostatic surgery capsule, and the two sides of the capsule plane were connected in front of the verumontanum. Secondly, the plane was maintained by the "fan tunnel" method, and the middle lobe and the lateral lobes were divided at the 5 o'clock and 7 o'clock positions. The glands of the middle lobe were first removed and pushed into the bladder. Then, on the anteroinferior inclined coronal plane through 12 o'clock point right above of verumontanum, the urethral mucosa was cut apart in a semi-curved shape in advance. Bilateral semi-curved incision confluenced above the verumontanum, and extend to the bladder neck to form an inverted Y-shaped groove which completely divided the bilateral lobes. Finally, the bilateral lobes were enucleated respectively, and glands in the bladder were removed by tissue morcellator. Clinical data included operative time, hemoglobin decrease, catheterization duration, postoperative hospital stay, preoperative and postoperative international prostate symptom score and quality of life (QOL) score. The efficiency of enucleation was calculated as prostatic volume divided by enucleation time (not including morcellation time). The efficiency of morcellation was calculated as prostatic volume divided by morcellation time. Paired t-test was used to compare the indexes before and after surgery. Results: All the operations of 60 cases were sumlessful, one of which prostate tissue was removed by conversion to transurethral resection prostate due to malfunction of tissue morcellator. The operative time was (115.2±52.9) minutes (range: 25 to 276 minutes). The enucleation efficiency was (0.81±0.35) ml/minutes (range: 0.17 to 1.58 ml/minutes). The morcellation efficiency was (6.60±4.28) ml/minutes (range: 0.89 to 17.42 ml/minutes). The hemoglobin was decreased by (15.9±12.3) g/L (range:-10 to 57 g/L). Meanwhile, catheterization duration was (5.2±2.9) days (range: 0.8 to 19.8 days), and postoperative hospital stays were (5.0±1.5) days (range: 1.9 to 11.9 days). Preoperative and postoperative IPSS scores (10.92±6.98 vs. 23.37±7.49, t=10.357, P=0.000) and QOL scores (1.75±1.62 vs. 4.53±1.47, t=9.373, P=0.000) were significantly different. Postoperative complications included: 4 cases of fever (greater than 38.5 ℃), 1 case of acute epididymitis, 1 case of bladder mucosal injury, and 1 case of active bleeding need blood transfusion therapy. Conclusion: "Point-line-surface-volume" four dimensional HoLEP is an effective and safe minimally invasive method in the treatment of BPH.