resistive index

resistive index

an indicator of resistance of an organ to perfusion. In ultrasonography, it can be calculated from the peak systolic velocity and the end diastolic velocity of blood flow.
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Each participant underwent Doppler ultrasonography three times to measure the diameter of the vertebral artery, the peak systolic velocity (PSV), the resistive index (RI), and the vertebral artery flow volume; the mean of the three measurements was calculated for each patient, for the OSA and control groups, and for various subgroups.
Normal hepatic artery waveforms include the presence of a brisk systolic upstroke with presence of diastolic flow, a resistive index range of 0.
And unlike renal transplantation, no reliable resistive index measurement has been established for acute rejection in pancreatic transplantation.
Doppler US revealed evidence of renal artery stenosis of the transplanted kidney with a main renal artery resistive index of 0.
6] Additionally, a resistive index of [greater than or equal to]0.
Objective: Our aim was to evaluate whether capsular artery resistive index measured by transrectal power Doppler ultrasonography (US) can be used as a dynamic parameter to determine the severity of benign prostate hyperplasia and the efficiency of the treatment.
Prostate volume and capsular artery resistive index were measured with transrectal power Doppler US.
The expected finding is a low resistive flow or decreased resistive index (0.
Although an elevated resistive index obtained at the arcuate arteries was previously described as an accurate method of detecting acute rejection, (6) it has been subsequently shown that increases in the resistive index can also be seen in various other conditions, including ATN, renal vein thrombosis, graft infection, compressive perinephric fluid collections and obstructive hydronephrosis.
Evaluation of renal transplant rejection by duplex Doppler examination: Value of the resistive index.
The hepatic artery resistive index has been shown to be unreliable in the assessment of transplant rejection.
Although elevated resistive index obtained at the arcuate arteries was previously described as an accurate method of detecting acute rejection, (23) it has been subsequently shown that increases in the resistive index can be seen in various other conditions, including acute tubular necrosis, renal vein thrombosis, graft infection, compressive perinephric fluid collections, and obstructive hydronephrosis.