External validation of the current scoring systems and derivation of a novel scoring system to predict stone free rates after retrograde intrarenal surgery in patients with cumulative stone diameter of 2–4 cm

Our primary aim is to perform the external validation of the current scoring systems in predicting stone-free status (SFS) after retrograde intrarenal surgery (RIRS) for renal stones 2–4 cm and develop a novel scoring system by re-examining possible predictive factors related to SFS. Patients who un...

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Bibliographic Details
Published in:Actas urológicas españolas (English ed.) 2023-05, Vol.47 (4), p.211-220
Main Authors: Polat, S., Danacioglu, Y.O., Yarimoglu, S., Soytas, M., Erdogan, A., Teke, K., Degirmenci, T., Tasci, A.I.
Format: Article
Language:English
Subjects:
Cálculos renales grandes
Flexible ureterorenoscopy
Humans
Kidney Calculi - surgery
Large renal stones
Lithotripsy
Litotricia
Nomograms
Retrospective Studies
ROC Curve
Scoring system
Sistema de puntuación
Treatment Outcome
Ureterorrenoscopia flexible
Urolithiasis
Urolitiasis
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Summary:Our primary aim is to perform the external validation of the current scoring systems in predicting stone-free status (SFS) after retrograde intrarenal surgery (RIRS) for renal stones 2–4 cm and develop a novel scoring system by re-examining possible predictive factors related to SFS. Patients who underwent RIRS due to renal stones with a cumulative stone diameter of 2–4 cm between January 2017 and March 2021 were retrospectively screened. Residual stones ≤2 mm were defined as clinically insignificant, and these cases were considered to have SFS. Possible predictive factors related to SFS were examined using the multivariate logistic regression analysis. A nomogram and a scoring system were developed using independent predictive variables. The prediction ability of the previous and the new scoring system were evaluated with the ROC analysis. The existing scoring systems were found to be insufficient in predicting SFS (AUC 
ISSN:2173-5786
2173-5786
DOI:10.1016/j.acuroe.2022.08.015