Evaluation of Possible Predictive Variables for the Outcome of Shock Wave Lithotripsy of Renal Stones
박용일, 유지형, 성락희, 노정희, 정재용,
소속 상세정보
박용일 ( Park Yong-Il )
인제대학교 의과대학 비뇨기과학교실
유지형 ( Yu Ji-Hyeong )
인제대학교 의과대학 상계백병원 비뇨기과학교실
성락희 ( Sung Luck-Hee )
인제대학교 의과대학 비뇨기과학교실
노정희 ( Noh Chung-Hee )
인제대학교 의과대학 비뇨기과학교실
정재용 ( Chung Jae-Yong )
인제대학교 의과대학 비뇨기과학교실
KMID : 0358320100510100713
Abstract
PurposeThe aim of this study was to evaluate possible predictive variables for the outcome of shock wave lithotripsy (SWL) of renal stones in a single center.
Materials and MethodsBetween March 2008 and March 2010, a retrospective review was performed of 115 patients who underwent SWL for solitary renal stones. The patients’ characteristics and stone size, location, skin-to-stone distance (SSD), and Hounsfield units (HU) of stone were reviewed. The impact of the possible predictors on the disintegration of the stones was evaluated by logistic regression analysis. Receiver operator characteristic (ROC) curves were generated to compare the predictive powers of the variables.
ResultsSeventy-nine patients (68.7%) had successful outcomes, whereas 36 patients (31.3%) had residual stones. Significant differences were found in the mean size and mean HU of the stones (size: 8.34±3.58 mm vs. 13.57±5.41 mm, p<0.001; HU: 675.29±254.34 vs. 1,075.00±290.41, p<0.001). In the unadjusted model, age, stone size, and stone density were significant predictors. In the reduced model, stone density and size were significant predictors for the outcome of SWL. The area under the ROC curve (AUC) was significantly higher for stone density and size than for the other parameters, but the AUC between stone density and size did not differ significantly (stone density: 0.874, stone size: 0.827, p=0.388).
ConclusionsStone density and size were significant predictors of the outcome of SWL for renal stones less than 2.0 cm in diameter. We should consider HU and stone size when making decisions on the treatment of renal stones.
키워드
Kidney calculi;Lithotripsy;X-ray computed tomography
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