肾血管对急性升高的肾盂内压力的反应：实验性尿路梗阻时的阻力指数测量
The renal vascular response to acutely elevated intrapelvic pressure: resistive index measurements in experimental urinary obstruction.
作者信息
Ulrich J C, York J P, Koff S A
机构信息
Division of Urology, Ohio State University Medical Center, Columbus, USA.
出版信息
J Urol. 1995 Sep;154(3):1202-4.
PURPOSE
To assess the accuracy of resistive index (RI) in the diagnosis of obstruction.
MATERIALS AND METHODS
The time course of RI and its relationship to intrapelvic pressure were measured in 6 dogs following unilateral obstruction.
RESULTS
Changes in RI 1) occurred as early as 1/2 hour after acute obstruction, 2) only reached diagnostic sensitivity after 3 to 4 hours, 3) accurately diagnosed obstruction whenever the RI ratio between the kidneys exceeded 1.15 and 4) were uninfluenced by alterations in intrapelvic pressure.
CONCLUSIONS
Because RI more closely reflects changes in renal blood flow than pelvic pressure, it can accurately diagnose acute obstruction but only after several hours. Diagnostic accuracy in chronic obstruction may be influenced by these physiologic relationships.
目的
评估阻力指数（RI）在诊断梗阻方面的准确性。
材料与方法
在6只单侧梗阻的犬中测量RI的时间进程及其与肾盂内压力的关系。
结果
RI的变化1）在急性梗阻后半小时就出现，2）仅在3至4小时后达到诊断敏感性，3）当两肾之间的RI比值超过1.15时能准确诊断梗阻，4）不受肾盂内压力变化的影响。
结论
由于RI比肾盂压力更能准确反映肾血流变化，它能准确诊断急性梗阻，但要在数小时后。这些生理关系可能会影响慢性梗阻的诊断准确性。
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