A. Eskild-jensen et al., Renal function outcome in unilateral hydronephrosis in newborn pigs. II. Function and volume of contralateral kidneys, J UROL, 165(1), 2001, pp. 205-209
Purpose: We evaluated the compensatory response of contralateral kidney gro
wth and function in pigs with unilateral hydronephrosis.
Materials and Methods: Unilateral partial ureteral obstruction causing seve
re hydronephrosis was induced at age 2 days in 12 piglets, while 10 underwe
nt sham operation. At ages 4, 12 and 24 weeks single kidney function was as
sessed using (99m)technetium diethylenetriaminepentaacetic acid differentia
l uptake on renography combined with the glomerular filtration rate estimat
ed from the plasma clearance of (99m)technetium diethylenetriaminepentaacet
ic acid. Kidney size was measured in parallel by magnetic resonance imaging
.
Results: At 4 weeks the glomerular filtration rate and volume of the contra
lateral kidneys did not differ from those in controls, although obstructed
kidney function was significantly decreased. At 12 weeks the mean glomerula
r filtration rate plus or minus standard error of mean of the contralateral
kidneys significantly increased to 1.60 +/- 0.11 versus 1.33 +/- 0.11 ml.
per minute per kg. (p <0.05), whereas kidney volume did not differ from tha
t in sham operated controls. At 24 weeks the glomerular filtration rate and
volume of the contralateral kidneys did not differ from those in controls.
Glomerular filtration rate and volume of the contralateral kidneys did not
correlate at 4 weeks but they correlated at 12 and 24 weeks (r = 0.94 and
0.89, respectively).
Conclusions: Initially kidneys contralateral to obstructed kidneys with dec
reased function had no increased growth or function. Furthermore, function
and volume of the contralateral kidneys were not associated at the early ag
e. Thus, the results of our study imply that determining the size (growth)
or function of the contralateral kidney at an early age does not predict fu
nction decrease in a partially obstructed kidney in this pig model.