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A Comprehensive Comparison of Guy’s Stone Score, CROES Nomogram, S.T.O.N.E. Nephrolithometry, and the Seoul Renal Stone Complexity Scoring System in Predicting Perioperative Outcomes after Percutaneous Nephrolithotomy

Chinnakhet Ketsuwan, MD¹, Kittinut Kijvikai, MD¹, Wisoot Kongchareonsombat, MD¹, Premsant Sangkum, MD¹, Sasiprapa Rongthong, MD², Charoen Leenanupunth, MD¹

Affiliation : ¹ Division of Urology, Department of Surgery, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand ² Department of Radiology, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand

Background: Various nephrolithometry scoring systems (NSS) are proposed to determine the structural configuration of kidney stones. Nevertheless, evidence of the comparison among these scoring systems in anticipating postoperative outcomes after percutaneous nephrolithotomy (PCNL) are limited.
Objective: To compare the correlation of four NSS with stone-free rates and perioperative results following PCNL.
Materials and Methods: The authors examined a retrospective study of patients with kidney stones who received PCNL. One hundred seventy-two patients admitted for surgery at Ramathibodi Hospital were assessed. Four NSS were compared, Guy’s Stone Score (GSS), the Clinical Research Office of the Endourological Society nephrolithometric nomogram (CROES), S.T.O.N.E. Nephrolithometry (STONE), and the Seoul National University Renal Stone Complexity (S-ReSC) scoring system. The authors evaluated the correlations between these four scoring systems with stone-free rates and postoperative outcomes.
Results: The stone-free status was 53.5%. There were significant differences in the mean scores of the four systems between the stone-free group and the not stone-free group (1.97 versus 3.70, p<0.05 in GSS; 242.40 versus 159.28, p<0.05 in CROES; 6.64 versus 9.08, p<0.05 in STONE; and 3.44 versus 8.41, p<0.05 in S-ReSC). Multivariate analysis revealed only S-ReSC as independent preoperative factors for PCNL success (p<0.001). Moreover, each scale had a significant correlation with blood loss, length of hospital stay, and operative time. Three scoring systems, all except STONE, were significantly associated with percentage change in estimated glomerular filtration rates (eGFR). There was no significant association among all four scoring systems with postoperative complications.
Conclusion: All four NSS represent excellent predictors for stone-free rates and correlate well with surgical outcomes.
Received 30 Sep 2019 | Revised 15 Jan 2020 | Accepted 16 Jan 2020

doi.org/10.35755/jmedassocthai.2020.08.10687

Keywords : GSS, CROES, STONE, S-ReSC, Percutaneous nephrolithotomy


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