Modified percutaneous nephrostomy ureteroscopy lithotropsy for renal calculus without hydronephrosis

Objective:To study modified percutaneous nephrostomy ureteroscopy lithotropsy for treatment of renal calculus without hydronephrosis and evaluate the safety and efficacy of the new procedure.Methods:Percutaneous small tract puncture nephrostomy followed by ureteroscopic lithotripsy through the channel of the F 16 trocar's sheath in the corresponding period was carried out in 103 cases of renal calculus without hydronephrosis. All cases were randomly divided into two groups- group A( 50 cases) and group B (53 cases). The groups A were operated by modified technique, and the other by traditional one. The difference between two groups for success and times of X-ray exposure were analysed in statistics.Results:The difference of success rate and time of exposing under X-ray were significant between group A and B (success rate P= 0.032,P 0.05. the time of X-ray exposure t= 2.69,P 0.01). The success rate of group A and B was 100% and 90.6% , respectively.Two cases ( 3.8%) were performed blood transfusion in group B, however, the time of X-ray exposure in each group was 60±15 s and 15±5 s, respectively.Conclusions:The merits of the new puncture procedure are safe , effective and benefit to one-stage PCNL and short times of X-ray exposure , particularly in treating renal stones without hydronephrosis.