Application of the S. T.O.N.E. score in extracorporeal shock wave lithotripsy for patients with ureteral calculi

Abstract

Objective To predict clearance of extracorporeal shock wave lithotripsy for patients with ureteral calculi by S. T.O.N.E. Score and to evaluate the effectiveness and sensitivity. Methods The S. T.O.N.E. Score consisted of 5 stone characteristics: (S)ize, (T)opography (location of stone), (O)bstruction, (N)umber of stones present, and (E)valuation of Hounsfield Units. The S. T.O.N.E. Score was applied to 915 patients with ureteral calculi who underwent extracorporeal shock wave lithotripsy for retrospective evaluation. The ROC curve, the area under the curve (AUC), and the accuracy of the S. T.O.N.E. score were evaluated by logistic regression model , and the sensitivity and specificity were calculated. Results Stone free rates (SFR) was found to be correlated to S. T.O.N.E. Score. As S. T.O.N.E. Score increased, the SFR decreased with a logical regression trend (P<0.001). Conclusions The S. T.O.N.E. Score is a novel assessment tool to predict SFR in patients with ureteral calculi who undergo extracorporeal shock wave lithotripsy. The S. T.O.N.E. Score will help to future analysis of the treatment of urolithiasis. Key words: Ureteral Calculi; Lithotripsy