[Doppler ultrasonography of the intrarenal arteries before and after radiologic treatment in XXXX ].

@entity1 @entity3551 @entity8 @entity101 @entity6 @entity177 @entity2885 @entity1876
Resistive index (RI) calculation on Doppler tracing of intrarenal arterial blood flow is a sensitive method for the early diagnosis of @entity3551 . However, the RI is not specific and can increase in a number of other conditions, e.g., old age, circulating endogenic factors or drugs, other @entity8 . The authors investigated RI usefulness and accuracy by measuring it both before and after the radiologic treatment of acute @entity1876 in 21 @entity1 , 9 of whom had @entity177 due to other causes, i.e., @entity101 , @entity6 and chronic @entity2885 . The clinical conditions of the @entity1 limited the feasibility of RI measurements before and after nephrostomy to 66%. In 22 kidneys in 17 @entity1 examined before nephrostomy, the RI ranged 0.63 to 0.93 (mean: 0.80); when the obstruction was unilateral, the RI was always higher than in the contralateral kidney. In 25 kidneys in 18 @entity1 examined after nephrostomy, the mean RI value was 0.68 (15% lower than before). Taking 0.7 as the cut-off value, RI sensitivity in detecting acute @entity1876 was high (about 90%), while its specificity was low (about 50%); specificity increased (to about 80%) when other concomitant causes of increased intrarenal arterial resistance, e.g., other vascular or parenchymal @entity8 , were not considered. In some cases, the method was also useful in excluding the presence of recurrent obstruction after ureteral stent removal. In conclusion, Doppler US values of intrarenal arterial perfusion are indicative of acute @entity1876 when they can be compared with those from the contralateral healthy kidney or when they can be measured, in the same @entity1 , before and after decompressive nephrostomy. In other cases, other @entity8 and some technical limitations must be considered.
