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. 2010 Nov;51(11):777-82.
doi: 10.4111/kju.2010.51.11.777. Epub 2010 Nov 17.

Treatment outcomes of retrograde intrarenal surgery for renal stones and predictive factors of stone-free

Soo Hyun Lim  1 , Byong Chang Jeong, Seong Il Seo, Seong Soo Jeon, Deok Hyun Han
Affiliations

Treatment outcomes of retrograde intrarenal surgery for renal stones and predictive factors of stone-free

Soo Hyun Lim et al. Korean J Urol. 2010 Nov.

Abstract

Purpose: The aim of this study was to evaluate the efficacy and safety of retrograde intrarenal surgery (RIRS) for the treatment of renal stones and to analyze the predictive factors for stone-free.

Materials and methods: We retrospectively reviewed the records of patients who underwent RIRS for renal stones from January 2000 to July 2009. We identified 66 RIRSs (63 patients with 3 bilateral renal stones) and collected data. Stone-free and success were respectively defined as no visible stones and clinically insignificant residual stones less than 3 mm on postoperative imaging; predictive factors for stone-free were evaluated.

Results: Of the 66 renal stones, 18 stones (27.3%) were located in the upper pole or midpole or renal pelvis and 48 (72.7%) in the lower pole with or without others, respectively. The mean cumulative stone burden was 168.9±392.5 mm(2). The immediate postoperative stone-free rate was 69.7%, and it increased to 72.7% at 1 month after surgery. The success rate was 80.3% both immediately after the operation and 1 month later. In the multivariate analysis, stone location except at the lower pole (p=0.049) and small cumulative stone burden (p=0.002) were significantly favorable predictive factors for the immediate postoperative stone-free rate. The overall complication rate was 6%.

Conclusions: RIRS is a safe and effective treatment for renal stones. The stone-free rate of RIRS was particularly high for renal stones with a small burden, except for those located in the lower pole. RIRS could be considered in selective patients with renal stones.

Keywords: Kidney calculi; Lithotripsy; Ureteroscopy.

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Conflict of interest statement

The authors have nothing to disclose.

Figures

FIG. 1
FIG. 1
Locations of stones and stone-free rates (Group 1: upper pole or mid pole or renal pelvis, Group 2: lower pole only, Group 3: lower pole with others).
See this image and copyright information in PMC

References

    1. Tiselius GH, Alken P, Buck C, Gallucci M, Knoll T, Sarica K, et al. EAU guidelines on urolithiasis. 2008 update. Downloaded from www.uroweb.org.
    1. Egilmez T, Tekin MI, Gonen M, Kilinc F, Goren R, Ozkardes H. Efficacy and safety of a new-generation shockwave lithotripsy machine in the treatment of single renal or ureteral stones: experience with 2670 patients. J Endourol. 2007;21:23–27. - PubMed
    1. Abe T, Akakura K, Kawaguchi M, Ueda T, Ichikawa T, Ito H, et al. Outcomes of shockwave lithotripsy for upper urinary-tract stones: a large-scale study at a single institution. J Endourol. 2005;19:768–773. - PubMed
    1. Tolon M, Miroglu C, Erol H, Tolon J, Acar D, Bazmanoglu E, et al. A report on extracorporeal shock wave lithotripsy results on 1,569 renal units in an outpatient clinic. J Urol. 1991;145:695–698. - PubMed
    1. Lingeman JE, Siegel YI, Steele B, Nyhuis AW, Woods JR. Management of lower pole nephrolithiasis: a critical analysis. J Urol. 1994;151:663–667. - PubMed