Relation between resistive index and serum creatinine level in first month after renal transplantation.

GRAFT SURVIVAL can be significantly improved by timely identification of renal transplant dysfunction. Doppler ultrasound, because of its noninvasive nature, is an ideal tool to defect many of the abnormalities associated with renal transplantation. Resistive index (RI) and pulsility index (PI) are both hemodynamic indices that reflect increased blood flow resistance, namely RI is the quotient of the peak systolic velocity minus the lowest diastolic velocity and the peak systolic velocity, and PI is the quotient of Maximum systolic velocity and mean velocity. Arterial inflow to the allograft may be impeded by several factors including rejection, acute tubular necrosis, renal vein thrombosis, obstruction, and graft compression by perirenal fluid collections such as urinomas or lymphoceles.