Iranian Journal of Radiology
2011;8(S1) : 68-68

Background/Objective: Obstruction of solitary
kidney is a serious problem because it usually leads
to elevation of serum creatinin. Tests using iodinated
contrast materials are contraindicated. Doppler
ultrasound (DU) with measurement of the renal
resistive index (RI) is useful in this regard. Obstruction
leads to changes in the hemodynamics of the kidney
with increase in the RI.
Patients and Methods: The study included 41 healthy
live kidney donors. There were 38 males and three
females with a mean age of 30 years. DU of the two
kidneys was done the day before nephrectomy with
measurement of the RI of each kidney in three levels
(main, interlobar and interlobular). After nephrectomy,
the RI of the remaining kidney was measured on days
7 and 90. The mean RI of the remaining kidney before
nephrectomy was compared with values at different
time points after nephrectomy.
Results: The left kidney was selected for nephrectomy
in 35 donors and the right one was used in the
remaining six. There was difference between the mean
RI of the right and left kidneys before nephrectomy
in the interlobar and interlobular artery level. The
mean RI of the remaining kidney increased 90 days
after nephrectomy but not at the seventh day. There
was no difference between the mean RI in three levels
before nephrectomy and on day 7. The mean RI of
the left remaining kidney after the right nephrectomy
(six donors) was compared with the right remaining
kidney after the left nephrectomy (35 donors). The
difference of RI was statistically signiificant only in
the main artery level on day 90.
Keywords: Resistive Index(RI), Live Donor
Nephrectomy, Single Kidney

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