The R.I.R.S. scoring system: An innovative scoring system for predicting stone-free rate following retrograde intrarenal surgery

• Published in: BMC urology 2017-11, Vol.17 (1), p.105-105, Article 105
• Main Authors: Xiao, Yinglong, Li, Deng, Chen, Lei, Xu, Yaoting, Zhang, Dingguo, Shao, Yi, Lu, Jun
• Format: Article
• Language: English
• Subjects: Analysis; Anatomy; Classification; Kidney stones; Prognosis; Stone surgery; Surgery; Urolithiasis
• ISSN: 1471-2490; 1471-2490
• DOI: 10.1186/s12894-017-0297-0

To establish and internally validate an innovative R.I.R.S. scoring system that allows urologists to preoperatively estimate the stone-free rate (SFR) after retrograde intrarenal surgery (RIRS). This study included 382 eligible samples from a total 573 patients who underwent RIRS from January 2014 to December 2016. Four reproducible factors in the R.I.R.S. scoring system, including renal stone density, inferior pole stone, renal infundibular length and stone burden, were measured based on preoperative computed tomography of urography to evaluate the possibility of stone clearance after RIRS. The median cumulative diameter of the stones was 14 mm, and the interquartile range was 10 to 21. The SFR on postoperative day 1 in the present cohort was 61.5% (235 of 382), and the final SFR after 1 month was 73.6% (281 of 382). We established an innovative scoring system to evaluate SFR after RIRS using four preoperative characteristics. The range of the R.I.R.S. scoring system was 4 to 10. The overall score showed a great significance of stone-free status (p