THE RELATIONSHIP BETWEEN THE INTRARENAL RESISTIVE INDEX AND THE POSTOPERATIVE RECOVERY OF RENAL FUNCTION IN THE KIDNEY WITH HYDROMNEPHROSIS CAUSED BY CALCULI IN UPPER URINARY TRACT

Objective To explore the relationship betwee n the intrarenal resistive index(RI) and the remanet and postoperative recovery of renal function in kidneys with hydronephrosis caused by calculi in upper urinar y tract.Methods In 55 patients who were treated operatively for t he hydronephrosis caused by calculi in upper urinary tract,the preoperative dama g degree and the postoperative recovery degree of the renal function were analyz ed according to different grades of intrarenal RI.Results The cor responding intrarenal RI were less than 0.65 ?0.65 to 0.75 and more than 0.7 5,th e percentage of the renal function in the kidney with hydronephrosis to the tota l renal function were (38.51±8.87)%?(24.31±7.71)%和(6.39±4.51)% respectively .The renal function recovered quickly in patients with RI less than 0.65.While t he renal function recovered slowly and not distinctly in patients with RI more t han 0.75.Conclusion The intrarenal RI is reliable in the estimation of the damag degree of renal fun ction in patients with hydronephrosis caused by calculi in upper urinary tract.W hen the RI is more than 0.75,the renal function has a serious damage and cannot have a obvious recovery after operation,and it can be a index for the nephrectom y in hydronephrosis.