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Background: Color
Doppler ultrasonography of intrarenal arterial resistance index (RI), performed
early after kidney transplant, has proven to reliably predict short-term
allograft function.
Purpose: The aim
of this study was to assess whether early Doppler assessment could also predict
long-term renal function.
Material and methods:
A retrospective study of intrarenal RI using ultrasound in 41 stable kidney
transplant patients who underwent RI assessment within 1 month after the
transplant. Color Doppler ultrasonography was done to calculate the intrarenal
RI within the first four weeks after transplant. The mean values of the intrarenal
RI of the interlobar arteries of the allograft kidneys were measured and
recorded. The data were analyzed with the aid of computer-based SPSS 20.0
software for windows.
Results: Older
recipient age, active smoking and proteinuria were associated with a higher
intrarenal RI. Multivariate analyses showed that renal RI and donor age were
independent predictors of allograft outcome. Kaplan-Meier estimates of
cumulative graft survival were significantly worse in patients who had the
values of the RI of 0.7 or more, than they were in patients who had the values
of the RI of less than 0.7 (p =0.002).
Conclusion: This
study reveals that renal RI determined within the first month after renal
transplant predicts long-term allograft function in kidney transplant recipients.
Keywords: Doppler
ultrasonography, Graft survival, Renal resistance index
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