Pozniak M A, Kelcz F, Stratta R J, Oberley T D
Department of Radiology, University of Wisconsin, Madison.
Invest Radiol. 1988 Dec;23(12):899-904. doi: 10.1097/00004424-198812000-00004.
Recently, numerous studies have referred to the resistive index as an accurate indicator of acute renal transplant rejection. We encountered several factors other than rejection that resulted in an elevation of the resistive index in both clinical and experimental situations. Any compressive effect on the kidney will elevate the resistive index. This compression may arise from an adjacent mass such as a fluid collection, most commonly hematoma, or even from excessive pressure transmitted via the transducer by a heavy-handed technician. Resistive index elevation also has been demonstrated in experimentally induced hypotension. Technically inaccurate scanning can yield a falsely low resistive index, but these previously mentioned entities can falsely elevate it, leading to an incorrect diagnosis of acute rejection.
最近，大量研究将阻力指数视为急性肾移植排斥反应的准确指标。我们发现在临床和实验情况下，除了排斥反应外，还有其他几个因素会导致阻力指数升高。对肾脏的任何压迫作用都会使阻力指数升高。这种压迫可能源于相邻的肿块，如积液，最常见的是血肿，甚至可能源于技术人员操作手法过重，通过换能器传递的过大压力。在实验性诱导的低血压中也证实了阻力指数升高。技术上不准确的扫描会得出错误的低阻力指数，但上述这些情况会错误地使其升高，从而导致对急性排斥反应的错误诊断。
