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Modified Seoul National University Renal Stone Complexity score for retrograde intrarenal surgery

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Abstract

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.

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Acknowledgments

We wish to thank Seungjun Son, Ohseong Kwon, Jeong Min Park, and Hahn-Ey Lee for assisting with data retrieval and review.

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There are no competing financial interests.

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Authors and Affiliations

  1. Department of Urology, Seoul National University Bundang Hospital, Seongnam, Korea

    Jin-Woo Jung, Byung Ki Lee, Yong Hyun Park, Sangchul Lee, Seong Jin Jeong, Sang Eun Lee & Chang Wook Jeong

  2. Department of Urology, College of Medicine, Seoul National University, Seoul, Korea

    Sangchul Lee, Seong Jin Jeong, Sang Eun Lee & Chang Wook Jeong

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  1. Jin-Woo Jung
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  2. Byung Ki Lee
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  3. Yong Hyun Park
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  4. Sangchul Lee
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  5. Seong Jin Jeong
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  6. Sang Eun Lee
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  7. Chang Wook Jeong
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Correspondence to Chang Wook Jeong.

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Jung, JW., Lee, B.K., Park, Y.H. et al. Modified Seoul National University Renal Stone Complexity score for retrograde intrarenal surgery. Urolithiasis 42, 335–340 (2014). https://doi.org/10.1007/s00240-014-0650-7

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  • DOI: https://doi.org/10.1007/s00240-014-0650-7

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