The Seoul National University Renal Stone Complexity (S-ReSC) score is a well-validated tool for the prediction of stone-free rate (SFR) after percutaneous nephrolithotomy.
We modified the S-ReSC score system for application to retrograde intrarenal surgery (RIRS) and evaluated this score. A total of 88 patients who underwent RIRS from 2011 to 2013 were included. The modified S-ReSC score was assigned according to the number of sites involved in the renal pelvis (#1), superior and inferior major calyceal groups (#2-3), and anterior and posterior minor calyceal groups of the superior (#4-5), middle (#6-7), and inferior calyx (#8-9). If the stone was in the inferior sites (#3, #8-9), one additional point per site was added to the original score. The SFR was examined according to the modified S-ReSC score. To evaluate the predictive accuracy, the area under the receiver operating characteristic curve (AUC) was used and compared with the Resorlu-Unsal Stone (RUS) score. The SFR was 85.2 % and was significantly decreased in the order of low (1-2: 94.2 %), medium (2-4: 84.0 %), and high (>4: 45.5 %) modified ReSC score groups (p < 0.001). AUCs of the modified S-ReSC score (0.806) and score group (0.766) were higher than the AUC of the RUS score (0.692; p = 0.012 and p = 0.040, respectively). The modified S-ReSC score predicts the SFR after RIRS well. Furthermore, its predictive accuracy is higher than that of the RUS score.
Written by:
Jung JW, Lee BK, Park YH, Lee S, Jeong SJ, Lee SE, Jeong CW. Are you the author?
Department of Urology, Seoul National University Bundang Hospital, Seongnam, Korea.
Reference: Urolithiasis. 2014 Mar 13. Epub ahead of print.
doi: 10.1007/s00240-014-0650-7
PubMed Abstract
PMID: 24623504
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