Background:Despite the continuous update of guidelines for the management of kidney stones,the ability to predict a successful response to extracorporeal shockwave lithotripsy(SWL)remains a topic of research.This is d...Background:Despite the continuous update of guidelines for the management of kidney stones,the ability to predict a successful response to extracorporeal shockwave lithotripsy(SWL)remains a topic of research.This is due to the need to refine the decision making in the context of technological advancements and current pandemics.This study aimed to determine the predictors of stone-free rate(SFR)after single-session SWL in adult patients with a single kidney stone 10 to 20 mm in diameter.Materials and methods:A retrospective review of the records of patients with a single kidney stone 10 to 20 mm in diameter was performed at a private SWL center from December 2019 to February 2021.Univariate and multivariate analyses were performed for stoneand patient-related factors,using the Student t and Mann-Whitney U tests for the quantitative variables and the Fisher exact and Pearson correlation tests for the qualitative variables.Results:A total of 138 patients were eligible for this study,including 92 men and 46 women.The mean age was 38.6±12.4years,and the mean body mass index(BMI)was 25.9±3.4kg/m^(2).Four weeks after SWL,120 patients(87%)were free of stones,and 18(13%)needed further treatment.Univariate analyses showed that SFR was negatively correlated with increased BMI(p=0.0001),maximum stone length(p=0.0001),transverse diameter of the stone(p=0.0001),number of shocks per session(p=0.052),and Hounsfield unit(HU)(p=0.0001).Multivariate analysis revealed that HU(p=0.009),maximum stone length(p=0.01),BMI(p=0.000),and presence of double-J stent(p=0.034)were independent risk factors for failure of single-session SWL in the treatment of kidney stones 10 to 20 mm in diameter.The estimated average cost per case was USD 450.5.Conclusions:Increased HU,maximum stone length,BMI,and presence of double-J stents were independent risk factors for low SFR after single-session SWL for a kidney stone 10 to 20 mm in diameter.The cost of SWL remains an advantage in the private sector.展开更多
文摘Background:Despite the continuous update of guidelines for the management of kidney stones,the ability to predict a successful response to extracorporeal shockwave lithotripsy(SWL)remains a topic of research.This is due to the need to refine the decision making in the context of technological advancements and current pandemics.This study aimed to determine the predictors of stone-free rate(SFR)after single-session SWL in adult patients with a single kidney stone 10 to 20 mm in diameter.Materials and methods:A retrospective review of the records of patients with a single kidney stone 10 to 20 mm in diameter was performed at a private SWL center from December 2019 to February 2021.Univariate and multivariate analyses were performed for stoneand patient-related factors,using the Student t and Mann-Whitney U tests for the quantitative variables and the Fisher exact and Pearson correlation tests for the qualitative variables.Results:A total of 138 patients were eligible for this study,including 92 men and 46 women.The mean age was 38.6±12.4years,and the mean body mass index(BMI)was 25.9±3.4kg/m^(2).Four weeks after SWL,120 patients(87%)were free of stones,and 18(13%)needed further treatment.Univariate analyses showed that SFR was negatively correlated with increased BMI(p=0.0001),maximum stone length(p=0.0001),transverse diameter of the stone(p=0.0001),number of shocks per session(p=0.052),and Hounsfield unit(HU)(p=0.0001).Multivariate analysis revealed that HU(p=0.009),maximum stone length(p=0.01),BMI(p=0.000),and presence of double-J stent(p=0.034)were independent risk factors for failure of single-session SWL in the treatment of kidney stones 10 to 20 mm in diameter.The estimated average cost per case was USD 450.5.Conclusions:Increased HU,maximum stone length,BMI,and presence of double-J stents were independent risk factors for low SFR after single-session SWL for a kidney stone 10 to 20 mm in diameter.The cost of SWL remains an advantage in the private sector.
