title: Predicting Outcomes after Minimally Percutaneous Nephrolithotomy with the Aid of a Patented System by Using the Guy's Stone Score.
abstract: OBJECTIVE
  At present, there is no report on the application of Guy's stone (GS) score in minimally invasive percutaneous nephrolithotomy (MPCNL). We therefore investigate the clinical effect of MPCNL by using a patented irrigation and clearance system according to the GS.
  
  
  METHODS
  A total of 222 consecutive patients were divided into 2 groups that were treated with MPCNL using the patented system or standard PCNL using Electro Medical System (EMS) ultrasound/ballistic trajectory lithotripsy and clearance system, respectively (124 patients in patented system group, 98 patients in EMS system group). The stone complexity and severity of complications were stratified by GS and Modified Clavien grading system in this study, respectively. The success and complication rates between MPCNL and PCNL were compared.
  
  
  RESULTS
  The patented system group had a significantly higher success rate (GS3: 95 vs. 43% and GS4: 67 vs. 31%) and a significantly less complications rate (GS3: 12 vs. 27% and GS4: 21 vs. 46%) in GS3 and GS4 compared with the EMS system group. Also, the patented system had significant lower complication rates in Clavien grades II-IV than that of the EMS system.
  
  
  CONCLUSIONS
  The MPCNL using the patented irrigation and clearance system was more efficient in dealing with renal stones of high complexity (GS3-4).
authors.affiliation: Department of Urology, AfxFB01;liated Ganzhou Hospital of Nanchang University, Ganzhou, Jiangxi, China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Deng
authors.forename: Leming
authors.initials: L
authors.lastname: Song
authors.forename: Donghua
authors.initials: D
authors.lastname: Xie
authors.forename: Jianrong
authors.initials: J
authors.lastname: Huang
authors.forename: Lunfeng
authors.initials: L
authors.lastname: Zhu
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang
authors.forename: Difu
authors.initials: D
authors.lastname: Fan
authors.forename: Zuofeng
authors.initials: Z
authors.lastname: Peng
authors.forename: Min
authors.initials: M
authors.lastname: Hu
authors.forename: Zhongsheng
authors.initials: Z
authors.lastname: Yang
authors.forename: Tairong
authors.initials: T
authors.lastname: Liu
authors.forename: Zhangqun
authors.initials: Z
authors.lastname: Ye
mesh_terms: D004867:Equipment Design; D005260:Female; D006801:Humans; D007669:Kidney Calculi / Q000473:pathology / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures; D009403:Nephrostomy, Percutaneous / Q000009:adverse effects / Q000295:instrumentation*; D010330:Patents as Topic; D011183:Postoperative Complications / Q000453:epidemiology / Q000209:etiology; D011379:Prognosis; D011446:Prospective Studies