CT值对输尿管结石ESWL疗效的预测价值

Value of hounsfield unit on CT in predicting the effect of ESWL in ureteral calculi

目的：了解非增强螺旋CT的结石CT值对输尿管结石ESWL疗效的预测价值。方法：对34例结石长径在0．4～1．2cm之间拟行ESWL治疗的输尿管下段单发结石患者，先进行非增强螺旋CT检查，测定结石CT值，分为CT值〈700HU组和〉700HU组，ESWI，后经复查，计算两组结石清除率，统计学分析两组间的基本特征和冲击次数、结石清除率差异。结果：与结石CT值〉700HU组相比，〈700HU组所需冲击次数少，结石清除率高。结论：非增强螺旋CT的结石CT值能预测输尿管结石ESWL后的结石清除率。CT值低者易于粉碎和排空，CT值高者结石清除率低，可考虑首选输尿管镜下碎石或开放手术取石。

Objective： To study the value of Hounsfield unit （HU） on non--contrast helical computerized tomography （NCHCT） in prediction of the effect of extracorporeal shock wave lithotripsy （ESWL） in ureteral calculi. Methods：A total of 34 cases of lower ureteric calculi 0.4- 1.2 cm in size, underwent NCHCT measuring the CT value, which divided them into two groups of 〈700 HU and 〉700 HU, and then ESWL. Results：The group of 〈700 HU showed fewer shock waves needed and higher stone-free rate than the group of 〉700 HU. Conclusions：The HU value on pretreatment NCHCT of the ureteric calculi can be used to predict the stone-free rate after ESWL. ESWL is not indicated to the ureteric calculi with high values of HU.