Value of preoperative stone scoring systems in predicting the results of percutaneous nephrolithotomy

Abstract

IntroductionGuy's Stone Score and S.T.O.N.E. Nephrolithometry nomograms have been introduced for systematic and quantitative assessment of kidney stones.The aim of this study was to reveal the value of two scorings systems, Guy and S.T.O.N.E, most frequently used for predicting postoperative stone-free status prior to Percutaneous Nephrolithotomy (PCNL), in the prediction of postoperative results of PCNL.Material and methodsWe retrospectively examined patients who underwent PCNL. Preoperative abdominopelvic computerized tomography images of these patients were reviewed and scored according to the Guy and S.T.O.N.E. systems.The relationship between the Guy and S.T.O.N.E. scores, and their postoperative stone-free status, complications based on Clavien system, operation time, fluoroscopy time and period of hospitalization was compared.ResultsWe identified a total of 102 patients who underwent PCNL between 2010 and 2014, having met the inclusion criteria.The relationships between the total S.T.O.N.E score and Clavien score (p <0.001); time of operation (p = 0.012) and stone-free status (p <0.001); Guy stone score and Clavien score (p <0.001); and period of hospitalization (p <0.001) and time of operation (p <0.001) were found to be statistically significant. There was no statistically significant relationship between Guy score and stone-free status and no statistically significant relationship was found between fluoroscopy time and both stone scoring systems.ConclusionsGuy and S.T.O.N.E. scoring systems may be used as effective instruments particularly for predicting postoperative complications.

STONE score versus Guy's Stone Score - prospective comparative evaluation for success rate and complications in percutaneous nephrolithotomy

“…In a retrospective study by Kumsar et al . [ 16 ] to compare GSS and STONE score the stone-free rate was 90%, 96%, and 34% in GSS 1, 2, and 3 groups, respectively. Few authors have also found GSS based on CT scan to be effective in predicting success rate of PCNL.…”

Predictive value of preoperative inflammatory response biomarkers for metabolic syndrome and post-PCNL systemic inflammatory response syndrome in patients with nephrolithiasis

“…Stone characteristics included the number of stones (detected via CT or MRI scan), staghorn (yes/no), stone location and stone burden. Stone surface area (stone burden) was calculated by the following formula: length × width × π × 0.25 [ 38 ]. In cases of multiple calculi, stone burden was defined as the sum of the surface area of each stone.…”

External validation and comparison of the scoring systems (S.T.O.N.E, GUY, CROES, S‐ReSC) for predicting percutaneous nephrolithotomy outcomes for staghorn stones: A single center experience with 160 cases

“…In contrast Kumsar et al. found significant association between S.T.O.N.E score and SFR, operation time and Clavien complication scores [22]. In the recent study, a positive correlation was not found between S.T.O.N.E score and SFR, CR.…”

“…Kumsar et al. showed significant association between Clavien score, operation time and Guy score [22]. However the authors revealed no correlation between SFR and Guy score.…”

“…Similarly, Akhavein et al advocated that although S.T.O.N.E scoring system was highly effective to predict postoperative SFR, it was not sufficient to predict CR [25]. In contrast Kumsar et al found significant association between S.T.O.N.E score and SFR, operation time and Clavien complication scores [22]. In the recent study, a positive correlation was not found between S.T.O.N.E score and SFR, CR.…”