Acta Scientific Medical Sciences (ASMS)(ISSN: 2582-0931)

Research Article Volume 6 Issue 2

Evaluation of the S.T.O.N.E Score to Predict the Outcomes of Flexible Ureteroscopy for Urinary Stones

Maatougui Jasser*, Raboudi Mehdi, Ben Rejeb Nedhir, Khiari Ramzi and Ghozzi Samir

Department of Urology, Military Hospital of Tunis, University of Tunis El Manar, Tunisia

*Corresponding Author: Maatougui Jasser, Department of Urology, Military Hospital of Tunis, University of Tunis El Manar, Tunisia.

Received: November 22, 2021; Published: January 12, 2022

Abstract

Over the years, several nomograms have been developed to predict the rate of no fragments after surgery for urinary stones. The objective of this work is to evaluate the S.T.O.N.E score to predict of the effectiveness of flexible ureteroscopy for urolithiasis.

The S.T.O.N.E score evaluates 5 parameters: S (Size): size, T (Topography): location, O (Obstruction): obstruction, N (Number), calculation number, E (Evaluation of Hounsfield Unit) computation density in Hounsfield unit. A score of 1 to 3 points is assigned to each parameter. Between January 2015 and December 2019, 92 interventions were performed. The S.T.O.N.E score was calculated retrospectively for each patient and correlated with the absence of residual fragment 3 months after flexible ureteroscopy (SFR: Stone Free Rate). We tried to determine the threshold value of this score through the analysis of the receiver operator curve.

The average S.T.O.N.E Score was 9.94. The Stone free rate was 81%. After statistical analysis, the area below the ROC curve was 0.73 IC-95% [0.624; 0.836]. In our study, a threshold of 10 or less was associated with an SFR of 59.3%. In comparison, a preoperative S.T.O.N.E Score strictly greater than 10 was associated with a significantly low stone free rate of 39.3%, p = 0.003.

In light of our results, the S.T.O.N.E score seems to be an easy, reliable and reproducible tool to predict the outcome of a flexible ureteroscopy.

Keywords: Nomograms; Flexible Ureteroscopy; Urinary Stones

References

  1. Molina W., et al. “The S.T.O.N.E. Score: A new assessment tool to predict stone free rates in ureteroscopy from pre-operative radiological features”. International Brazilian Journal of Urology 1 (2014): 23-29.
  2. Lechevallier E., et al. “Imagerie et calcul de la voie excrétrice urinaire supérieure”. Progress in Urology12 (2008): 863-867.
  3. Noureldin YA., et al. “Which is better? Guy's versus S.T.O.N.E. nephrolithometry scoring systems in predicting stone-free status post-percutaneous nephrolithotomy”. World Journal of Urology11 (2015): 1821-1825.
  4. Okhunov Z., et al. “Interobserver reliability and reproducibility of S.T.O.N.E. nephrolithometry for renal calculi”. Journal of Endourology 27 (2013b): 1303-1306.
  5. Jiang K., et al. “Evaluation of three stone-scoring systems for predicting SFR and complications after percutaneous nephrolithotomy: a systematic review and meta-analysis”. BMC Urology 19 (2019): 57.
  6. Richard F., et al. “Evaluation and comparison of scoring systems for predicting stone-free status after flexible ureteroscopy for renal and ureteral stones”. PLoS One8 (2020).

Citation

Citation: Maatougui Jasser., et al. “Evaluation of the S.T.O.N.E Score to Predict the Outcomes of Flexible Ureteroscopy for Urinary Stones”.Acta Scientific Medical Sciences 6.2 (2022): 61-64.

Copyright

Copyright: © 2022 Maatougui Jasser., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.




Metrics

Acceptance rate30%
Acceptance to publication20-30 days
Impact Factor1.403

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