2. UroToday Home
  3. Recent Abstracts
  4. Endourology & Urolithiasis
  5. Minimally Invasive Procedures

EAU 2018: Predictive Nomogram For One-session Success Rate of Shock Wave Lithotripsy Using Stone Heterogeneity Index, Mean Stone Density And Maximal Stone Length

Copenhagen, Denmark (UroToday.com) Dr. Kang, a clinical urologist from the Inha University School of Medicine, Incheon, South Korea, presented on a retrospective study that utilized mean stone density (MSD), stone heterogeneity index (SHI) and maximum stone length (MSL) to create a nomogram that would predict the primary success rate of shock wave lithotripsy (SWL). In the past, these variables have been reported on non-contrast computed tomography (NCCT) as factors that would presume the success rate of SWL.

For the study, the medical records of 700 patients, who had undergone their first session of SWL for ureter calculi, were obtained and internally validated through 131 patients who underwent SWL a year after the endpoint of the original patient cohort. Multivariate analysis was used to determine significant factors and logistic regression model was used to confirm. It was found that MSL, MSD, and SHI were the most significant contributing factors, therefore a nomogram for success rate was developed based on those factors. Furthermore, an internal validity analysis was performed and determined high predictability of nomogram.

In conclusion, due to the high predictive model score from the internal validation, the nomogram developed in this study proved to be a feasible basic model for the selection of treatment in patients with ureteral stones.

Speaker: Dr. Kang

Authors: Kang D.H., Kang S.K., Oh K.T., Lee S.H., Cho K.S., Ham W.S., Choi Y.D., Lee J.Y.

Written by: Whitney Zhang, Department of Urology, University of California-Irvine, at the 2018 European Association of Urology Meeting EAU18, 16-20 March, 2018 Copenhagen, Denmark